ONLINE SYSTEM SERVICES INC
8-K, 1999-09-02
COMPUTER INTEGRATED SYSTEMS DESIGN
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<PAGE>

                       SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549


                                    FORM 8-K


                                 CURRENT REPORT


                       Pursuant to Section 13 or 15(d) of
                      the Securities Exchange Act of 1934


    Date of Report (date of earliest event reported):        August 25, 1999
                                                             ---------------


                          ONLINE SYSTEM SERVICES, INC.
                          ----------------------------
             (Exact name of registrant as specified in its charter)


                                       Colorado
                  --------------------------------------------
                 (State or other jurisdiction of incorporation)



       0-28462                                         84-1293864
       -------                                         ----------
(Commission File Number)                    (IRS Employer Identification No.)



1800 Glenarm Place, Suite 800, Denver, CO                 80202
- -----------------------------------------                 -----
(Address of principal executive offices)               (Zip Code)



Registrant's telephone number, including area code:    (303) 296-9200
                                                       --------------



                                      N/A
              ---------------------------------------------------
         (Former name or former address, if changed since last report)
<PAGE>

Item 5.  OTHER EVENTS.

     On August 26, 1999, Online System Services, Inc. (d/b/a Webb Interactive
Services, Inc.) ("OSS") completed a bridge financing in the amount of $5 million
provided by Castle Creek Technology Partners LLC, a technology focused
investment firm.  Paine Webber Incorporated served as placement agent and
advisor on the transaction.  The securities were issued without registration
pursuant to the Securities Act of 1933 in reliance upon the exemption therefrom
provided in Regulation D of such Act.

     The financing was in the form of a redeemable Promissory Note which becomes
convertible into shares of OSS' common stock if not previously redeemed, 120
days after issuance at a maximum conversion price equal to the lesser of 110% of
the Market Price for OSS common stock on August 25, 1999, or the average of the
five lowest closing bid prices during the 15 trading days prior to conversion.
In addition to the Note, the investor was issued a five-year Warrant
representing the right to acquire 136,519 shares of OSS' common stock at $11.44
per share.  OSS is in the process of determining a fair market value of the
Warrant and the Promissory Note. Once the fair value of the Warrant and the
Promissory Note have been determined, OSS will discount the Promissory Note
appropriately and will record additional non-cash charges for interest expense
over the life of the Promissory Note for the amortization of the discount. The
discount is expected to be from approximately $500,000 to $1.1 million. In
addition, during the 120-day period following the issuance of the Note, OSS
will record a non-cash charge for accretion relating to the so-called beneficial
conversion feature of the Note.  A determination of the value of the beneficial
conversion feature is dependent upon the value attributed to the Warrant
discussed above. The beneficial conversion feature is expected to be from
approximately $1.3 million to $1.9 million. The shares subject to the Warrant
and to the Note, should the Note become convertible, are subject to registration
rights. For additional information regarding the transaction, reference is made
to Exhibits 10.1 and 10.2 filed herewith.



Item 7.    FINANCIAL STATEMENTS AND EXHIBITS.

     (a)  Financial Statements.

          None

     (c)  Exhibits:

          10.1  Securities Purchase Agreement dated August 25, 1999 between OSS
                and Castle Creek Technology Partners LLC ("Castle Creek Partners
                LLC"), including the Form of Warrant and Registration Rights
                Agreement*

          10.2  Promissory Note dated August 25, 1999 issued by OSS to
                Castle Creek Partners LLC*

          99.1  Press Release Issued by OSS on August 26, 1999*

- -----------------
          * filed herewith

<PAGE>

                                  SIGNATURES

     Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.


Dated: September 2, 1999             ONLINE SYSTEM SERVICES, INC.



                                     By    /s/ Lindley S. Branson
                                         --------------------------
                                         Lindley S. Branson

                                      Its:   Executive Vice-President/
                                                              General Counsel

<PAGE>

                                                                    Exhibit 10.1

                         SECURITIES PURCHASE AGREEMENT
                         -----------------------------

          This SECURITIES PURCHASE AGREEMENT ("Agreement") is entered into as of
                                               ---------
August 25, 1999, by and between Online System Services, Inc., a Colorado
corporation doing business as Webb Interactive Services, Inc. (the "Company"),
                                                                    -------
with headquarters located at 1800 Glenarm Place, Suite 700, Denver, Colorado
80202, and Castle Creek Technology Partners LLC (the "Purchaser"):
                                                      ---------

                                    RECITALS
                                    --------

          A.  The Company and the Purchaser are executing and delivering this
Agreement in reliance upon the exemption from securities registration afforded
by the provisions of Regulation D ("Regulation D"), as promulgated by the United
                                    ------------
States Securities and Exchange Commission (the "SEC") under the Securities Act
                                                ---
of 1933, as amended (the "Securities Act").
                          --------------

          B.  The Purchaser desires to purchase, and the Company desires to
issue and sell, upon the terms and conditions stated in this Agreement, (i) an
amount of the Company's three-year 10% Convertible Promissory Notes (the "Note")
                                                                          ----
in the form of Exhibit A which is convertible into shares of the Company's
               ---------
Common Stock, no par value (the "Common Stock"), (ii) a warrant in the form of
                                 ------------
Exhibit B (the "Warrant" and, when taken together with the Note, the "Purchased
- ---------       -------                                               ---------
Securities") entitling the holder thereof to purchase the number of shares (the
- ----------
"Warrant Shares") of Common Stock as set forth below.  The Note and the PIK
 --------------
Notes (as defined in the Note) are collectively referred to herein as the
"Convertible Securities".  The shares of Common Stock issuable upon conversion
- -----------------------
of or otherwise pursuant to the Convertible Securities are referred to herein as
the "Conversion Shares."  The Convertible Securities, the Warrant, the
     -----------------
Conversion Shares and the Warrant Shares are collectively referred to herein as
the "Securities".
     ----------

          C.  Contemporaneously with the execution and delivery of this
Agreement, the parties hereto are executing and delivering a Registration Rights
Agreement in the form attached hereto as Exhibit C (the "Registration Rights
                                         ---------       -------------------
Agreement"), pursuant to which the Company has agreed to provide certain
- ---------
registration rights under the Securities Act, the rules and regulations
promulgated thereunder and applicable state securities laws.

                                   AGREEMENTS
                                   ----------

          NOW, THEREFORE, in consideration of their respective promises
contained herein and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the Company and the Purchaser
hereby agree as follows:
<PAGE>

                                   ARTICLE 1
                   PURCHASE AND SALE OF SECURITIES; SECURITY

          1.1  Purchase of Note and Warrant.  The purchase price (the "Purchase
               ----------------------------                            --------
Price") to be paid by the Purchaser for the Note and Warrant being purchased by
- -----
the Purchaser shall be Five Million Dollars ($5,000,000.00).  On the Closing
Date (as defined herein), subject to the terms and the satisfaction (or waiver)
of the conditions set forth in Articles VI and VII, the Company shall issue and
sell to the Purchaser, and the Purchaser shall purchase from the Company (i) a
Note in principal amount equal to the Purchase Price and (ii) a Warrant
entitling the holder thereof to purchase 136,519 Warrant Shares.

          1.2  Form of Payment.  At the Closing, the Purchaser shall pay the
               ---------------
Purchase Price for the Note and Warrant by wire transfer to the Company, in
accordance with the Company's written wiring instructions, against delivery of a
duly executed Note and Warrant, and the Company shall deliver to the Purchaser
such executed Note and Warrant against delivery of such Purchase Price from the
Purchaser.

          1.3  Closing Date.  Subject to the satisfaction (or waiver) of the
               ------------
conditions set forth in Articles VI and VII below, the date and time of the
issuance, sale and purchase of the Note and Warrant pursuant to this Agreement
shall be August 25 , 1999.  (the "Closing").  The Closing shall occur at 11:00
                                  -------
a.m. Chicago time, at the offices of Altheimer & Gray, 10 S. Wacker Drive,
Chicago, IL 60606.  The date of the Closing is hereinafter referred to as the
"Closing Date."

                                   ARTICLE 2
                  PURCHASER'S REPRESENTATIONS AND WARRANTIES

          The Purchaser represents and warrants to the Company as set forth in
this Article II.  The Purchaser makes no other representations or warranties,
express or implied, to the Company in connection with the transactions
contemplated hereby and any and all prior representations and warranties, if
any, which may have been made by the Purchaser to the Company in connection with
the transactions contemplated hereby shall be deemed to have been merged in this
Agreement and any such prior representations and warranties, if any, shall not
survive the execution and delivery of this Agreement.

          2.1  Purchase for Own Account.  The Purchaser is purchasing the Note
               ------------------------
and Warrant for the Purchaser's own account for investment only and not with a
view toward or in connection with the public resale or distribution thereof,
except pursuant to sales that are exempt from the registration requirements of
the Securities Act and/or sales registered under the Securities Act.  The
Purchaser will not resell any of the Purchased Securities or any securities
which may be issued upon exchange or conversion thereof except pursuant to sales
that are exempt from the registration requirements of the Securities Act and/or
sales registered under the Securities Act.  The Purchaser understands that the
Purchaser must bear the economic risk of this investment indefinitely, unless
the Securities are registered pursuant to the Securities Act and any applicable
state securities laws or an exemption from such registration is available, and
<PAGE>

that the Company has no present intention of registering any such Securities
other than as contemplated by the Registration Rights Agreement.  By making the
representations in this Section 2.1, the Purchaser does not agree to hold any
Securities for any minimum or other specific term and reserves the right to
dispose of any or all of the Securities at any time in accordance with or
pursuant to a registration statement or an exemption from registration under the
Securities Act.

          2.2  Accredited Investor Status.  The Purchaser is an "accredited
               --------------------------
investor" as that term is defined in Rule 501(a) of Regulation D.

          2.3  Reliance on Exemptions.  The Purchaser understands that the
               ----------------------
Securities are being offered and sold to the Purchaser in reliance upon specific
exemptions from the registration requirements of the United States federal and
state securities laws and that the Company is relying upon the truth and
accuracy of the representations and warranties of the Purchaser set forth herein
in order to determine the availability of such exemptions and the eligibility of
the Purchaser to acquire the Securities.

          2.4  Information.  The Purchaser and its counsel have been furnished
               -----------
all materials relating to the business, finances and operations of the Company
and materials relating to the offer and sale of the Purchased Securities which
have been specifically requested by the Purchaser.  The Purchaser has been
afforded the opportunity to ask questions of the Company and has received what
the Purchaser believes to be complete and satisfactory answers to any such
inquiries.  Neither such materials or inquiries nor any other due diligence
investigation conducted by the Purchaser nor any of its representations,
warranties, covenants or agreements shall modify, amend or affect the
Purchaser's right to rely on the Company's representations and warranties
contained in Article III.  The Purchaser understands that the Purchaser's
investment in the Securities involves a high degree of risk.

          2.5  Governmental Review.  The Purchaser understands that no United
               -------------------
States federal or state agency or any other government or governmental agency
has passed upon or made any recommendation or endorsement of the Securities or
an investment therein.

          2.6  Transfer or Resale.  The Purchaser understands that (i) except as
               ------------------
provided in the Registration Rights Agreement, the Securities have not been and
are not being registered under the Securities Act or any state securities laws,
and may not be transferred unless subsequently registered thereunder or an
exemption from such registration is available (which exemption the Company
expressly agrees may be established as contemplated in clauses (b) and (c) of
Section 5.1 hereof or as otherwise may be permissible under the Securities Act);
(ii) any sale of such Securities made in reliance on Rule 144 under the
Securities Act (or a successor rule) ("Rule 144") may be made only in accordance
                                       --------
with the terms of said Rule and further, if said Rule is not applicable, any
resale of such Securities without registration under the Securities Act) may
require compliance with some other exemption under the Securities Act or the
rules and regulations of the SEC thereunder; and (iii) neither the Company nor
any other person is
<PAGE>

under any obligation to register such Securities under the Securities Act or any
state securities laws or to comply with the terms and conditions of any
exemption thereunder (in each case, other than pursuant to this Agreement or the
Registration Rights Agreement).

          2.7  Legends.  The Purchaser understands that, subject to Article V
               -------
hereof, the certificates for the Note, the Warrant and, until such time as the
Conversion Shares and Warrant Shares have been registered under the Securities
Act as contemplated by the Registration Rights Agreement or otherwise may be
sold by the Purchaser pursuant to Rule 144 or otherwise without registration,
the certificates for the Conversion Shares and the Warrant Shares will bear a
restrictive legend (the "Legend") in the following form:
                         ------

          THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR THE SECURITIES LAWS
OF ANY STATE OF THE UNITED STATES.  THE SECURITIES REPRESENTED HEREBY MAY NOT BE
OFFERED OR SOLD OR OTHERWISE TRANSFERRED IN THE ABSENCE OF AN EFFECTIVE
REGISTRATION STATEMENT FOR THE SECURITIES UNDER APPLICABLE SECURITIES LAWS OR
UNLESS OFFERED, SOLD OR TRANSFERRED PURSUANT TO AN AVAILABLE EXEMPTION FROM THE
REGISTRATION REQUIREMENTS OF THOSE LAWS.

          Except for the Legend in accordance with this Section 2.7 and Section
5.1 hereof, the Securities shall bear no other legend.

          2.8  Authorization; Enforcement.  This Agreement and the Registration
               --------------------------
Rights Agreement have been duly and validly authorized, executed and delivered
on behalf of the Purchaser and are valid and binding agreements of the Purchaser
enforceable against Purchaser in accordance with their terms.

          2.9  Residency.  The Purchaser is a resident of the State of Illinois.
               ---------


                                   ARTICLE 3
                 REPRESENTATIONS AND WARRANTIES OF THE COMPANY

          The Company represents and warrants to the Purchaser that:

          3.1  Organization and Qualification.  The Company and each of its
               ------------------------------
subsidiaries is a corporation duly organized, validity existing and in good
standing under the laws of the jurisdiction in which it is incorporated, and has
the requisite corporate power and authority to own its properties and to carry
on its business as now being conducted.  The Company and each of its
subsidiaries is duly qualified as a foreign corporation to do business and is in
good standing in every jurisdiction where the failure to so qualify would have a
Material Adverse Effect.  "Material Adverse Effect" means any material adverse
                           -----------------------
effect on (i) the business, operations, properties, financial condition,
operating results or prospects of the Company and its subsidiaries, taken as a
whole on a
<PAGE>

consolidated basis, (ii) the transactions contemplated hereby, (iii) the ability
of the Company to perform its obligations under this Agreement, the Note, the
Warrant or the Registration Rights Agreement, including any exhibits thereto
(collectively, the "Investment Agreements") or (iv) the Purchaser's interest in
                    ---------------------
the Securities.

          3.2  Authorization; Enforcement.  (a) The Company has the requisite
               --------------------------
corporate power and authority to (i) enter into, and perform its obligations
under each of the Investment Agreements, (ii) issue, sell and perform its
obligations with respect to the Note and the Warrant in accordance with the
terms hereof and thereof, and (v) issue the Conversion Shares in accordance with
the terms and conditions of the Note and the Warrant Shares in accordance with
the terms and conditions of the Warrant; (b) the execution, delivery and
performance of this Agreement and the Registration Rights Agreement and the
execution and delivery of the Note and the Warrant by the Company and the
consummation by it of each of the transactions contemplated hereby and thereby
(including without limitation the issuance of the Convertible Securities and the
Warrant and the reservation for issuance and issuance of the Conversion Shares
and the Warrant Shares) have been duly authorized by all necessary corporate
action and no further consent or authorization of the Company, its board of
directors, or its stockholders or any other person, body or agency is required
with respect to any of the transactions contemplated hereby or thereby (whether
under rules of the Nasdaq Small Cap Market ("Nasdaq") or Nasdaq National Market
                                             ------
System ("Nasdaq NMS"), the New York Stock Exchange ("NYSE") or any other
         ----------                                  ----
exchange on which the Company's Securities are traded, the National Association
of Securities Dealers or otherwise); (c) this Agreement, the Note, the Warrant
and the Registration Rights Agreement have been duly executed and delivered by
the Company; and (d) each of the Investment Agreements constitutes a legal,
valid and binding obligation of the Company enforceable against the Company in
accordance with its terms.

          3.3  Capitalization.  The capitalization of the Company as of the date
               --------------
of this Agreement, including the authorized capital stock, the number of shares
issued and outstanding, the number of shares reserved for issuance pursuant to
the Company's stock option plans, the number of shares reserved for issuance
pursuant to securities (other than the Convertible Securities and the Warrant),
directly or indirectly, exercisable for, or convertible into or exchangeable for
any shares of Common Stock and the number of shares to be initially reserved for
issuance upon conversion of the Convertible Securities and the exercise of the
Warrant is set forth on Schedule 3.3.  All of such outstanding shares of capital
                        ------------
stock have been, or upon issuance will be, validly issued, fully paid and non-
assessable.  No shares of capital stock of the Company (including the Warrant
Shares and the Conversion Shares) are subject to preemptive rights or any other
similar rights of the stockholders of the Company or any liens or encumbrances.
Except as disclosed in Schedule 3.3, as of the date of this Agreement, (i) there
                       ------------
are no outstanding options, warrants, scrip, rights to subscribe for, calls or
commitments of any character whatsoever relating to, or securities or rights
convertible into or exercisable or exchangeable for, directly or indirectly, any
shares of capital stock of the Company or any of its subsidiaries, or contracts,
commitments, understandings or arrangements by which the
<PAGE>

Company or any of its subsidiaries is or may become bound to issue additional
shares of capital stock of the Company or any of its subsidiaries, and (ii)
there are no agreements or arrangements under which the Company or any of its
subsidiaries is obligated to register the sale of any of its or their securities
under the Securities Act (except the Registration Rights Agreement). The Company
has furnished to the Purchaser true and correct copies of the Company's
Certificate of Incorporation as currently in effect ("Certificate of
                                                      --------------
Incorporation"), and the Company's By-laws as currently in effect (the "By-laws)
- -------------                                                           -------
The Company has set forth on Schedule 3.3 all instruments and agreements (other
                             ------------
than the Certificate of Incorporation and By-laws) governing securities
convertible into or exercisable or exchangeable for Common Stock of the Company
(and the Company shall provide to the Purchaser copies thereof upon the request
of the Purchaser). Except as set forth on Schedule 3.3, the Company has no
                                          ------------
indebtedness for borrowed money and no agreement providing for indebtedness for
borrowed money. The Company has no share purchase agreements, rights plans,
agreements or instruments containing similar provisions and no agreements
containing anti-dilution provisions. The Company shall provide the Purchaser
with a written update of this representation signed by the Company's Chief
Executive Officer or Chief Financial Officer on behalf of the Company as of the
Closing Date and it shall be a condition to the Purchaser's obligations at
Closing that there are no material changes in such capitalization since the
Company's representation on the date hereof. The Company has no subsidiaries,
except as provided on Schedule 3.3. All such subsidiaries included on Schedule
                      ------------                                    --------
3.3. are one hundred percent (100%) owned by the Company.  Except as provided on
- ---
Schedule 3.3, the Company has no investments, either debt or equity, in any
- ------------
other entity.

          3.4  Issuance of Shares.  The Conversion Shares and Warrant Shares are
               ------------------
duly authorized and reserved for issuance, and, upon conversion of the
Convertible Securities or exercise of the Warrant, each in accordance with the
terms thereof, will be validly issued, fully paid and non-assessable, and free
from all taxes, liens, claims and encumbrances and will not be subject to
preemptive rights or other similar rights of stockholders of the Company.  The
Convertible Securities and the Warrant are duly authorized and reserved for
issuance, and are validly issued, fully paid and non-assessable, and free from
all taxes, liens claims and encumbrances and are not and will not be subject to
preemptive rights or other similar rights of stockholders of the Company.  No
further corporate authorization or approval (other than authorization and
approval of the Rule 4460(i) Authorization by the shareholders of the Company
(the "Shareholder Approval") is required under the rules of the Nasdaq with
respect to the transaction contemplated by this Agreement, including, without
limitation, the issuance of the Conversion Shares and the Warrant Shares.  The
"Rule 4460(i) Authorization" shall mean (i) if Nasdaq has confirmed in writing
- ---------------------------
to the Company that the Warrant Shares issuable upon full exercise of the
Warrant (without giving effect to any limitations thereon) are not subject to
Rule 4460(i) and are not integrated with the issuance of shares of Common Stock
upon conversion of the Convertible Securities, the issuance of shares of Common
Stock upon conversion of the Convertible Securities (without giving effect to
any limitations thereon, including Rule 4460(i)), and (ii) otherwise, the
issuance of shares of Common Stock upon conversion of the Convertible Securities
and upon full exercise
<PAGE>

of the Warrant (in each case, without giving effect to any limitations thereon,
including Rule 4460(i)).

          3.5  No Conflicts.  The execution, delivery and performance of each of
               ------------
the Investment Agreements, by the Company and the consummation by the Company of
the transactions contemplated hereby and thereby (including the issuance and
reservation for issuance, as applicable, of the Warrant Shares and the
Conversion Shares) do not and will not (a) result in a violation of the
Certificate of Incorporation or By-laws of the Company or any of its
subsidiaries, (b) conflict with, or constitute a default (or an event which with
notice or lapse of time or both would become a default) under, or give to others
any rights of termination, amendment, acceleration or cancellation of, any
agreement, indenture or instrument to which the Company or any of its
subsidiaries is a party (except for such conflicts, defaults, terminations,
amendments, accelerations, and cancellations as would not, individually or in
the aggregate, have a Material Adverse Effect), or (c) result in a violation of
any law, rule, regulation, order, judgment or decree (including, without
limitation, U.S. federal and state securities laws and regulations) applicable
to the Company or any of its subsidiaries, or by which any property or asset of
the Company or any of its subsidiaries, is bound or affected.  Neither the
Company nor any of its subsidiaries is in violation of its Certificate of
Incorporation, by-laws or other organizational documents, and neither the
Company nor any of its subsidiaries is in default (and no event has occurred
which, with notice or lapse of time or both, would put the Company or any of its
subsidiaries in default) under, nor has there occurred any event giving others
(with notice or lapse of time or both) any rights of termination, amendment,
acceleration or cancellation of, any agreement, indenture or instrument to which
the Company or any of its subsidiaries is a party, except for possible defaults
or rights as would not, individually or in the aggregate, have a Material
Adverse Effect.  The business of the Company and its subsidiaries is not being
conducted, and shall not be conducted so long as the Purchaser owns any of the
Securities, in violation of any law, ordinance, rule, regulation, order,
judgment or decree of any governmental entity, court or arbitration tribunal
except for possible violations the sanctions for which either singly or in the
aggregate would not have a Material Adverse Effect.  The Company is not required
to obtain any consent, authorization or order of, or make any filing or
registration with, any court or governmental agency or any regulatory or self-
regulatory agency or authority in order for it to execute, deliver or perform
any of its obligations under any of the Investment Agreements or to perform its
obligations in accordance with the terms hereof or thereof.  The purchase and
acquisition of the Securities by the Purchaser does not violate any law, rule,
regulation, order, judgment or decree applicable to the Company, or require
further filing by the Company or the Purchaser under such law, rule, regulation,
order, judgment or decree, by virtue of the Company's business or assets.  The
Company is not in violation of the listing requirements of Nasdaq and does not
reasonably anticipate that the Common Stock will be de-listed by Nasdaq for the
foreseeable future.  The Company will make all necessary filings and
notifications with, and will obtain all necessary approvals from, Nasdaq with
respect to the transactions contemplated hereby, including, without limitation,
the issuance of the Securities and the listing of the
<PAGE>

Conversion Shares and the Warrant Shares on Nasdaq immediately upon request by
the Purchaser.

          3.6  Registration and SEC Documents.  The Common Stock is registered
               ------------------------------
under Section 12 of the Securities Exchange Act of 1934, as amended (the
"Exchange Act") and has been so registered since May 23, 1996.  Since June 30,
1998, the Company has timely filed all reports, schedules, forms, statements and
other documents required to be filed by it with the SEC pursuant to the
reporting requirements of the Exchange Act (all of the foregoing filed after
January 1, 1998 and all exhibits included therein and financial statements and
schedules thereto and documents incorporated by reference therein, being
referred to herein as the "SEC Documents").  The Company has delivered to the
                           -------------
Purchaser true and complete copies of the SEC Documents (the SEC documents filed
prior to the date hereof, the "Filed SEC Documents").  As of their respective
                               -------------------
dates, the SEC Documents complied in all material respects with the requirements
of the Exchange Act and the rules and regulations of the SEC promulgated
thereunder applicable to the SEC Documents, and none of the SEC Documents, at
the time they were filed with the SEC, contained any untrue statement of a
material fact or omitted to state a material fact required to be stated therein
or necessary in order to make the statements therein, in light of the
circumstances under which they were made, not misleading.  Except as disclosed
on Schedule 3.6 of this Agreement, none of the statements made in any such SEC
Document is, or has been, required to be updated or amended under applicable
law.  The financial statements of the Company included in the SEC Documents were
prepared in accordance with U.S. generally accepted accounting principles,
consistently applied, and the rules and regulations of the SEC during the
periods involved (except (i) as may be otherwise indicated in such financial
statements or the notes thereto, or (ii) in the case of unaudited interim
statements, to the extent they do not include footnotes or are condensed or
summary statements) and present accurately and completely the consolidated
financial position of the Company and its consolidated subsidiaries as of the
dates thereof and the consolidated results of their operations and cash flows
for the periods then ended (subject, in the case of unaudited statements, to
normal, immaterial year-end audit adjustments).  Except as set forth in the
financial statements of the Company included in the Filed SEC Documents, the
Company has no liabilities, contingent or otherwise, other than (i) liabilities
incurred subsequent to the date of such financial statements in the ordinary
course of business consistent with past practice and (ii) obligations under
contracts and commitments incurred in the ordinary course of business and not
required under generally accepted accounting principles to be reflected in such
financial statements, in each case of clause (i) and (ii) next above which,
individually and in the aggregate, are not material to the financial condition,
business, operations, properties, operating results or prospects of the Company
and its subsidiaries taken on a whole.  The Filed SEC Documents, as supplemented
by Schedule 3.6 hereto, contain a complete and accurate list of all material
   ------------
undischarged written or oral contracts, agreements, leases or other instruments
to which the Company or any subsidiary is a party or by which the Company or any
subsidiary is bound or to which any of the properties or assets of the Company
or any subsidiary is subject (each a "Contract").  None of the Company, its
                                      --------
subsidiaries or, to the best knowledge of the Company, any of the other parties
thereto, is in breach or violation of
<PAGE>

any Contract, which breach or violation relates to indebtedness for borrowed
money, is with respect to an obligation in excess of One Hundred Thousand
dollars ($100,000) or would have a Material Adverse Effect. No event, occurrence
or condition exists which, with the lapse of time, the giving of notice, or
both, or the happening of any further event or condition, would become a breach
or default by the Company or its subsidiaries under any Contract which breach or
default would have a Material Adverse Effect.

          3.7  Absence of Certain Changes.  Since June 30, 1999, there has been
               --------------------------
no material adverse change and no material adverse development in the business,
properties, operations, financial condition, results of operations or prospects
of the Company.

          3.8  Absence of Litigation.  Except as disclosed in Schedule 3.8,
               ---------------------                          ------------
there is no action, suit, proceeding, inquiry or investigation before or by any
court, public board, governmental agency or authority, or self-regulatory
organization or body pending or, to the knowledge of the Company or any of its
subsidiaries, threatened against or affecting the Company, any of its
subsidiaries, or any of their respective directors or officers in their
capacities as such, wherein an unfavorable decision, ruling or finding could
have a Material Adverse Effect or would adversely affect the transactions
contemplated by this Agreement or any of the documents contemplated hereby or
which would adversely affect the validity or enforceability of, or the authority
or ability of the Company to perform its obligations under, this Agreement or
any of such other documents.  There are no facts which, if known by a potential
claimant or governmental agency or authority, could give rise to a claim or
proceeding which, if asserted or conducted with results unfavorable to the
Company or any of its subsidiaries, could have a Material Adverse Effect.

          3.9  Disclosure.  No information relating to or concerning the Company
               ----------
set forth in this Agreement or provided to the Purchaser in connection with the
transactions contemplated hereby contains an untrue statement of a material fact
or omits to state a material fact necessary in order to make the statements made
herein or therein, in light of the circumstances under which they were made, not
misleading.  Except for the execution and performance of this Agreement, no
material fact (within the meaning of the federal securities laws of the United
States) exists with respect to the Company or any of its subsidiaries which has
not been publicly disclosed.

          3.10  Acknowledgment Regarding Purchaser's Purchase of the Securities.
                ----------------------------------------------------------------
The Company acknowledges and agrees that the Purchaser is acting independently
and is not acting as a financial advisor or fiduciary of the Company (or in any
similar capacity) with respect to this Agreement or the transactions
contemplated hereby, that this Agreement and the transaction contemplated
hereby, and the relationship between the Purchaser and the Company, are "arms-
length", and that any statement made by the Purchaser, or any of its
representatives or agents, in connection with this Agreement or the transactions
contemplated hereby is not advice or a recommendation, is merely incidental to
the Purchaser's purchase of the Securities and has not been relied upon in any
way by the Company, its officers, directors or other representatives.  The
Company further represents
<PAGE>

to the Purchaser that the Company's decision to enter into this Agreement and
the transactions contemplated hereby has been based solely on an independent
evaluation by the Company and its representatives.

          3.11  Current Public Information.  The Company is currently eligible
                --------------------------
to register the resale of the Conversion Shares and Warrant Shares by the
Purchaser on a registration statement on Form S-3 under the Securities Act for
the account of Purchaser (and not for or on behalf of Company).

          3.12  No General Solicitation.  Neither the Company nor any person
                -----------------------
acting on behalf of the Company has conducted any "general solicitation," as
described in Rule 502(c) under Regulation D, with respect to any of the
Securities being offered hereby.

          3.13  No Integrated Offering.  Neither the Company, nor any of its
                ----------------------
affiliates, nor any person acting on its or their behalf, has directly or
indirectly made any offers or sales of any security or solicited any offers to
buy any security under circumstances that would prevent the parties hereto from
consummating the transactions contemplated hereby pursuant to an exemption from
registration under the Securities Act pursuant to the provisions of Regulation
D.  The transactions contemplated hereby are exempt from the registration
requirements of the Securities Act, assuming the accuracy of the representations
and warranties herein contained of the Purchaser to the extent relevant for such
determination.

          3.14  No Brokers.  The Company has taken no action which would give
                ----------
rise to any claim by any person for brokerage commissions, finder's fees or
similar payments by the Purchaser relating to this Agreement or the transactions
contemplated hereby, except for dealings with Paine Webber Incorporated (the
fees of which shall be paid in full by the Company)

          3.15  Acknowledgment of Dilution.  The number of Conversion Shares
                --------------------------
issuable upon conversion of the Convertible Securities and/or Warrant Shares
issuable upon exercise of the Warrant may increase substantially in certain
circumstances, including the circumstance wherein the trading price of the
Common Stock declines.  The Company's executive officers and directors have
studied and fully understand the terms of this Agreement and the transactions
contemplated hereby and the nature of the securities being sold hereunder and
recognize that they have a potential dilutive effect.  The board of directors of
the Company has unanimously concluded in its good faith business judgment that
the issuance of the Securities as contemplated hereby is in the best interests
of the Company.  The Company acknowledges that its obligation to issue
Conversion Shares upon conversion of the Convertible Securities and the Warrant
Shares upon exercise of the Warrant is binding upon it and enforceable
regardless of the dilution that such issuance may have on the ownership
interests of other stockholders.

          3.16  Intellectual Property.  Each of the Company and its subsidiaries
                ---------------------
owns or possesses adequate and enforceable rights to use all patents, patent
applications, trademarks, trademark applications, trade names, service marks,
copyrights, copyright
<PAGE>

applications, licenses, know-how (including trade secrets and other unpatented
and/or unpatentable proprietary or confidential information, systems or
procedures) and other similar rights and proprietary knowledge (collectively,
"Intangibles") used or necessary for the conduct of its business as now being
 -----------
conducted and as previously described in the Company's Annual Report on Form 10-
KSB most recently filed and any subsequently filed reports on Form 10-QSB and
Form 8-K. Neither the Company nor any subsidiary of the Company infringes on or
is in conflict with any right of any other person with respect to any
Intangibles nor is there any claim of infringement made by a third party against
or involving the Company or any of its subsidiaries, which infringement,
conflict or claim, individually or in the aggregate, if the subject of an
unfavorable decision, ruling or finding, would have a Material Adverse Effect.

          3.17  Foreign Corrupt Practices.  Except as provided in Schedule 3.17,
                -------------------------
neither the Company, nor any of its subsidiaries, nor any director, officer,
agent, employee or other person acting on behalf of the Company or any
subsidiary has, in the course of his actions for, or on behalf of, the Company,
used any corporate funds for any unlawful contribution, gift, entertainment or
other unlawful expenses relating to political activity; made any direct or
indirect unlawful payment to any foreign or domestic government official or
employee from corporate funds; violated or is in violation of any provision of
the U.S. Foreign Corrupt Practices Act of 1977, as amended; or made any bribe,
rebate, payoff, influence payment, kickback or other unlawful payment to any
foreign or domestic government official or employee.  Without limiting the
generality of the foregoing, the Company and its subsidiaries have not directly
or indirectly made or agreed to make (whether or not said payment is lawful) any
payment to obtain, sales other than usual and regular compensation to its or
their employees and sales representatives with respect to such sales.

          3.18  Key Employees.  Each Key Employee (as defined below) is
                -------------
currently serving the Company in the capacity disclosed in Schedule 3.18.  No
                                                           -------------
Key Employee, to the best of the knowledge of the Company and its subsidiaries,
is, or is now expected to be, in violation of any material term of any
employment contract, confidentiality, disclosure or proprietary information
agreement, non-competition agreement, or any other contract or agreement or any
restrictive covenant, and the continued employment of each Key Employee does not
subject the Company or any of its subsidiaries to any liability with respect to
any of the foregoing matters.  No Key Employee has, to the best of the knowledge
of the Company and its subsidiaries, any intention to terminate or limit his
employment with, or services to, the Company or any of its subsidiaries, nor is
any such Key Employee subject to any constraints (e.g., litigation) which would
cause such employee to be unable to devote his full time and attention to such
employment or services.  "Key Employee" means each of R. Steven Adams, Lindley
                          ------------
S. Branson, William R. Cullen, Perry Evans, Andre Durand, Simon Greenman, and
Gwenael Hagen and any individual hired by the Company after the date hereof to
perform or assume any of the duties of any Key Officer.
<PAGE>

          3.19  Solvency.  Immediately before and after giving effect to the
                --------
transactions contemplated by this Agreement, the Company (i) has not incurred
and does not intend to incur, or believe that it will incur, debts beyond its
ability to pay such debts as they become due, and (ii) owns and will have
assets, the fair saleable value of which is (a) greater than the total amount of
its liabilities (including contingent liabilities) and (b) greater than the
amount that will be required to pay the probable liabilities of its then
existing debts as they become absolute and matured.

          3.20  Year 2000 Compliance.  The information set forth in the Filed
                --------------------
SEC Documents with respect to Year 2000-related compliance by the Company does
not contain any untrue statement of a material fact or omit any material fact
necessary to make the statements contained therein not misleading.  The
Company's testing compliance program and contingency plan, in each case
regarding Year 2000-related matters, are adequate to prevent a Material Adverse
Effect and such Year 2000-related matters will not cause a Material Adverse
Effect.

                                   ARTICLE 4
                                   COVENANTS

          4.1  Best Efforts.  The Company shall use its best efforts timely to
               ------------
satisfy each of the conditions described in Articles VI and VII of this
Agreement.

          4.2  Securities Laws.  The Company agrees to file a Form D with
               ---------------
respect to the Securities with the SEC as required under Regulation D and to
provide a copy thereof to the Purchaser on or prior to the date of Closing.  The
Company agrees to file a Form 8-K disclosing this Agreement and the transactions
contemplated hereby with the SEC within three (3) days following the Closing
Date.  Such Form 8-K shall contain as exhibits this Agreement, the form of Note,
the form of Warrant and the Registration Rights Agreement.  The Company shall,
on or prior to the date of Closing, take such action as is necessary to sell the
Securities to the Purchaser in accordance with applicable securities laws of the
states of the United States, and shall provide evidence of any such action so
taken to the Purchaser on or prior to the date of the applicable Closing.
Without limiting any of the Company's obligations under any Investment Agreement
from and after the Closing Date, neither the Company nor any person acting on
its behalf shall take any action which would adversely affect any exemptions
from registration under the Securities Act with respect to the transactions
contemplated hereby.

          4.3  Reporting Status.  So long as the Purchaser beneficially owns any
               ----------------
of the Securities, the Company shall timely file all reports required to be
filed with the SEC pursuant to the Exchange Act, and the Company shall not
terminate its status as an issuer required to file reports under the Exchange
Act even if the Exchange Act or the rules and regulations thereunder would
permit such termination.

          4.4  Use of Proceeds.  The Company shall use the proceeds from the
               ---------------
sale of the Securities for working capital and general corporate purposes.
<PAGE>

          4.5  Issuance of Additional Securities.
               ---------------------------------

               (a) The Company shall use its best efforts to consummate an
     equity, equity-linked or equity-like offering of at least Twenty Million
     Dollars ($20,000,000.00) on or before the date which is one hundred twenty
     (120) days after the Closing Date (the "Financing").
                                             ---------

               (b) For a period (the "Restricted Period") beginning on the date
     hereof and ending the earlier of one-year from Closing or the completion of
     a Financing transaction in compliance with this Section 4.5 and in which
     (i) investors other than Purchaser invest $10 million and (ii) the
     Purchaser had a right, pursuant to this Section 4.5, to acquire Additional
     Securities (as defined below) with a purchase price of at least Ten Million
     Dollars ($10,000,000.00) (subject, however, to the $5 million limitation
     contained below for strategic investors), the Company shall not issue or
     agree to issue, (except (i) to the Purchaser pursuant to this Agreement,
     the Convertible Securities or the Warrant, (ii) equity securities issued in
     an underwritten public offering which raises proceeds to Company of at
     least Twenty Million Dollars ($20,000,000), (iii) equity securities issued
     as payment for corporate acquisitions or (iv) stock options issued to
     directors, officers and employees pursuant to any employee stock option,
     stock purchase or restricted stock plan of the Company in effect on the
     date hereof up to the aggregate amounts set forth on Schedule 4.5 hereto),
                                                          ------------
     any equity securities, any equity-like or any equity-linked securities (or
     any security convertible into or exercisable or exchangeable, directly or
     indirectly, for equity, equity-like or equity-linked securities of the
     Company) (each of the foregoing being an "Additional Security") unless the
                                               -------------------
     Company first offers such Additional Securities to the Purchaser and
     provides Purchaser with at least twenty (20) days advance written notice of
     the proposed terms and conditions of the proposed offering of Additional
     Securities, including, without limitation, pricing and aggregate amount of
     such offering.  Purchaser shall have the right, but not the obligation, by
     written notice to the Company prior to the closing of such offering, to
     participate in such offering (which notice of participation may be
     conditioned upon the successful consummation of such offering in an amount
     of at least Twenty Million Dollars ($20,000,000) including any amount to be
     so taken up by Purchaser (provided that in the event such offering is
     consummated in accordance with this Section 4.5 with investments by
     investors other than Purchaser investing an aggregate amount of at least
     $10 million, Purchaser's right of participation shall terminate as
     aforesaid regardless of whether Purchaser participates in such offering)).
     In the event that Purchaser elects to so participate in an offering under
     this paragraph, Purchaser shall be entitled to pay the purchase price for
     the Additional Securities to be purchased by it in such offering by
     exchanging outstanding Notes.  Any Notes so exchanged in
<PAGE>

     satisfaction of the payment of the purchase price by Purchaser in such
     offering shall be credited against such purchase price on a dollar for
     dollar basis in an amount equal to the sum of the outstanding principal
     amount of such Notes so exchanged plus interest accrued thereon through the
     date of such exchange. Notwithstanding the foregoing, the Company may limit
     Purchaser's rights under this Section 4.5(b) to acquire Additional
     Securities having a purchase price of up to Five Million Dollars
     ($5,000,000.00) if the balance of capital to be raised is funded by
     strategic investors. Without the consent of Purchaser, the Company may not
     consummate an offering which was the subject of a notice pursuant to this
     paragraph except on terms and conditions (including, without limtation,
     price) which are the same or are less favorable to the investors than set
     forth in such notice to Purchaser pursuant to this paragraph unless the
     Company again complies with the provisions of this Section 4.5(b) with
     respect thereto. Following such Restricted Period, the Company may issue
     Additional Securities provided that any securities so issued (and any
     securities issued or issuable, directly or indirectly, upon conversion,
     exercise or exchange of any of such securities) shall be ineligible for
     conversion, exercise, exchange, sale, resale and registration under Federal
     and state securities laws for a period of nine (9) months following the
     Closing Date.

               (c) While the Purchaser holds any Convertible Securities, the
     Company and each of its subsidiaries shall not, directly or indirectly,
     issue, or authorize for issuance, or enter into any commitment to issue,
     sell, transfer, distribute or otherwise dispose of any debt or equity
     security, bond, note or other security of, or with respect to, any of the
     Company's subsidiaries.

          4.6  Expenses.  The Company shall pay to the Purchaser Fifty Thousand
               --------
Dollars ($50,000.00) at the Closing for the expenses incurred by it and its
affiliates and advisors in connection with the negotiation, preparation,
execution, and delivery of this Agreement and the other agreements and documents
to be executed in connection herewith, including, without limitation,
Purchaser's and its affiliates' and advisors' due diligence and attorneys' fees
and expenses (the "Expenses").
                   --------

          4.7  Information.  The Company agrees to send the following reports to
               -----------
the Purchaser until the Purchaser transfers, assigns or sells all of its
Securities:  (a) within three (3) days after the filing with the SEC, a copy of
its Annual Report on Form 10-KSB, its Quarterly Reports on Form 10-QSB, any
proxy statements and any Current Reports on Form 8-K; and (b) within one (1) day
after release, copies of all press releases issued by the Company or any of its
subsidiaries.  The Company further agrees to promptly provide to the Purchaser
any information with respect to the Company, its properties, or its business or
the Purchaser's investment as the Purchaser may reasonably request; provided,
however, that if any information requested by the Purchaser from the
<PAGE>

Company contains material non-public information, the Company shall inform the
Purchaser in writing that the information requested contains material non-public
information and shall in no event provide the material non-public portion of
such information to the Purchaser without the express prior written consent of
the Purchaser after being so informed, and in the case of any such consent the
Company shall make public disclosure of such information simultaneously with
providing such information to Purchaser (unless the Board of Directors of the
Company determines in its good faith business judgment that such public
disclosure would have a Material Adverse Effect, in which event no such public
disclosure shall be made and no such material non-public information shall be
provided to Purchaser). In the event that the Company shall be required under
the terms of this Agreement or any other Investment Agreement to make disclosure
of material non-public information, the Company shall upon provision thereof to
Purchaser make simultaneous public disclosure thereof.

          4.8  Intentionally omitted.
               ---------------------

          4.9  Listing Requirement.  The Company shall continue the trading and
               -------------------
listing of its Common Stock on the Nasdaq Small Cap Market and the Company shall
use its best efforts to become listed on the Nasdaq National Market System or
the New York Stock Exchange and shall include from and after the Closing all
Conversion Shares and Warrant Shares in such listing(s) and shall comply in all
respects with the Company's filing and other obligations under the rules of
Nasdaq Small Cap Market or Nasdaq National Market System or the New York Stock
Exchange, as applicable, and shall not permit the suspension or termination of
any such trading.

          4.10  Prospectus Delivery Requirement.  The Purchaser understands that
                -------------------------------
the Securities Act may require delivery of a prospectus relating to the Common
Stock in connection with any sale thereof pursuant to a registration statement
under the Securities Act covering the resale by the Purchaser of the Common
Stock being sold.

          4.11  Intentional Acts or Omissions.  The Company shall not
                -----------------------------
intentionally perform any act which if performed, or intentionally omit to
perform any act which, if omitted to be performed, would prevent or excuse the
performance of this Agreement or any of the transactions contemplated hereby or
the benefits intended to be secured thereby by the Purchaser (including, without
limitation, pursuant to any agreements or documents obtained by the Company as a
condition to any Closing hereunder).

          4.12  Corporate Existence.  So long as the Purchaser beneficially owns
                -------------------
any Convertible Securities or the Warrant, the Company shall maintain its
corporate existence, except in the event of a merger, consolidation or sale of
all or substantially all of the Company's assets, as long as the surviving or
successor entity in such transaction assumes the Company's obligations hereunder
and under the agreements and instruments entered into in connection herewith
regardless of whether or not the Company would have had a sufficient number of
shares of Common Stock authorized and available for
<PAGE>

issuance in order to effect the conversion of all Convertible Securities
outstanding as of the date of such transaction.

          4.13  Intentionally omitted.
                ---------------------

          4.14  Intentionally omitted.
                ---------------------

          4.15  Reserved Amount.  On the Closing Date and thereafter, the
                ---------------
Company shall have authorized and reserved and keep available for issuance not
less than 1,129,568 shares (subject to equitable adjustment for any stock
splits, stock dividends, reclassification or similar events and subject to
reduction for the number of any shares of Common Stock issued upon conversion of
the Convertible Securities and upon the exercise of the Warrants)) shares of
Common Stock (the "Reserved Amount") solely for the purpose of effecting the
                   ---------------
conversion of the Convertible Securities and the exercise of the Warrant.  The
Company shall at all times reserve and keep available out of its authorized but
unissued shares of Common Stock a sufficient number of shares of Common Stock to
provide for the full conversion of all Convertible Securities and issuance of
the shares of Common Stock in connection therewith in each of the foregoing
cases without regard to any limitation on conversion or exercise and the full
exercise of the Warrant and issuance of the shares of Common Stock in connection
therewith in each of the foregoing cases without regard to any limitation on
conversion or exercise.  If the Reserved Amount for any three (3) consecutive
trading days (the last of such three (3) trading days being the "Authorization
                                                                 -------------
Trigger Date") shall be less than 175% of the number of shares of Common Stock
- ------------
issuable upon conversion of Convertible Securities and exercise of the Warrant
on such trading days, the Company shall immediately notify the Purchaser of such
occurrence and shall take action as soon as possible, but in any event within
sixty (60) days after an Authorization Trigger Date (including, if necessary,
shareholder approval to authorize the issuance of additional shares of Common
Stock), to increase the Reserved Amount to two hundred percent (200%) of the
number of shares of Common Stock then issuable upon conversion of the
Convertible Securities and exercise of the Warrant in each of the foregoing
cases without regard to any limitation on conversion or exercise.

          4.16  [Intentionally Deleted].
                ------------------------

          4.17  Waiver of Usury Defense.  To the extent permitted by applicable
                -----------------------
law, the Company agrees that it will not assert, plead (as a defense or
otherwise) or in any manner whatsoever claim (and will actively resist any
attempt to compel it to assert, plead or claim) in any action, suit or
proceeding that the effective interest rate on the Convertible Securities
violates present or future usury or other laws relating to the interest payable
on any indebtedness and will not otherwise avail itself (and will actively
resist any attempt to compel it to avail itself) of the benefits or advantages
of any such laws.
<PAGE>

                                   ARTICLE 5
                  LEGEND REMOVAL, TRANSFER, AND CERTAIN SALES

          5.1  Removal of Legend.  The Legend shall be removed and the Company
               -----------------
shall issue a certificate without any legend to the holder of any Security upon
which such Legend is stamped, and a certificate for a Security shall be
originally issued without the Legend if (a) the sale of such Security is
registered under the Securities Act, (b) such holder provides the Company with
an opinion of counsel, in form, substance and scope customary for opinions of
counsel in comparable transactions (the reasonable cost of which shall be borne
by the Company, so long as the Securities represented by such Legended
certificate(s) are not registered on an effective Registration Statement which
is available for immediate use and all the Securities may be publicly sold or
transferred in reliance thereon) to the effect that a public sale or transfer of
such Security may be made without registration under the Securities Act or (c)
such Security can be sold pursuant to Rule 144 and a registered broker dealer
provides to the Company's transfer agent and counsel copies of (i) a "will sell"
letter satisfying the guidelines established by the SEC and its staff from time
to time and (ii) a customary seller's representation letter with respect to such
a sale to be made pursuant to Rule 144 and (iii) a Form 144 in respect of such
Security executed by such holder and filed (or mailed for filing) with the SEC
or (d) such Security can be sold pursuant to Rule 144(k).  The Purchaser agrees
to sell all Securities, including those represented by a certificate(s) from
which the Legend has been removed, or which were originally issued without the
Legend, pursuant to an effective registration statement and to deliver a
prospectus in connection with such sale or in compliance with an exemption from
the registration requirements of the Securities Act.  In the event the Legend is
removed from any Security or any Security is issued without the Legend and
thereafter the effectiveness of a registration statement covering the resale of
such Security is suspended or a supplement or amendment thereto is required by
applicable securities laws, then upon reasonable advance notice to the Purchaser
holding such Security, the Company may require that the Legend be placed on any
such Security that cannot then be sold pursuant to an effective registration
statement or Rule 144 or with respect to which the opinion referred to in clause
(b) next above has not been rendered, which Legend shall be removed when such
Security may be sold pursuant to an effective Registration Statement or Rule 144
or such holder provides the opinion with respect thereto described in clause (b)
next above.

          5.2  Transfer Agent Instructions.  The Company shall instruct its
               ---------------------------
transfer agent to issue certificates, registered in the name of the Purchaser or
its nominee, for the Conversion Shares or Warrant Shares in such amounts as
specified from time to time by the Purchaser to the Company upon, and in
accordance with, the conversion of the Convertible Securities and the exercise
of the Warrant.  Such certificates shall bear a legend only in the form of the
Legend and only to the extent permitted by Section 5.1 above.  The Company
warrants that no instruction other than such instructions referred to in this
Article V, and no stop transfer instructions other than stop transfer
instructions to give effect to Section 2.6 hereof in the case of the Conversion
Shares or Warrant Shares prior to registration under the Securities Act, will be
given by the Company to its transfer
<PAGE>

agent and that the Securities shall otherwise be freely transferable on the
books and records of the Company. Nothing in this Section shall affect in any
way the Purchaser's obligations and agreement set forth in Section 5.1 hereof to
resell the Securities pursuant to an effective registration statement and to
deliver a prospectus in connection with such sale or in compliance with an
exemption from the registration requirements of applicable securities laws.
Without limiting any other rights of the Purchaser or obligations of the
Company, if (a) the Purchaser provides the Company with an opinion of counsel,
which opinion of counsel shall be in form, substance and scope customary for
opinions of counsel in comparable transactions (the reasonable cost of which
shall be borne by the Company, so long as the Securities represented by such
Legended certificate(s) are not registered on an effective Registration
Statement which is available for immediate use and all the Securities may be
publicly sold or transferred in reliance thereon), to the effect that the
Securities to be sold or transferred may be sold or transferred pursuant to an
exemption from registration or (b) the Purchaser transfers Securities pursuant
to Rule 144, the Company shall permit the transfer, and, in the case of the
Conversion Shares and Warrant Shares, promptly instruct its transfer agent to
issue one or more certificates in such name and in such denomination as
specified by the Purchaser in order to effect such a transfer or sale. The
Company acknowledges that a breach by it of its obligations hereunder will cause
irreparable harm to the Purchaser by vitiating the intent and purpose of the
transaction contemplated hereby. Accordingly, the Company acknowledges that the
remedy at law for a breach of its obligations under this Article V will be
inadequate and agrees, in the event of a breach or threatened breach by the
Company of the provisions of this Article V, that the Purchaser shall be
entitled, in addition to all other available remedies, to an injunction
restraining any breach and requiring immediate issuance and transfer, without
the necessity of showing economic loss and without any bond or other security
being required.

                                   ARTICLE 6
                CONDITIONS TO THE COMPANY'S OBLIGATION TO SELL

          6.1  Conditions to the Company's Obligation to Sell.  The obligation
               ----------------------------------------------
of the Company hereunder to issue and sell the Purchased Securities to the
Purchaser at Closing is subject to the satisfaction, as of the date of such
Closing, of each of the following conditions thereto, provided that these
conditions are for the Company's sole benefit and may be waived by the Company
at any time in its sole discretion:

               (a) The Purchaser shall have executed the signature page to this
     Agreement and the Registration Rights Agreement and delivered the same to
     the Company.

               (b) The Purchaser shall deliver the applicable Purchase Price for
     the Note and the Warrant purchased at Closing.

               (c) The representations and warranties of the Purchaser shall be
     true and correct as of the date when made and as of the Closing as though
<PAGE>

     made at that time, and the Purchaser shall have performed, satisfied and
     complied in all material respects with the covenants and agreements
     required by this Agreement to be performed or complied with by the
     Purchaser at or prior to the Closing.

               (d) No statute, rule, regulation, executive order, decree, ruling
     or injunction shall have been enacted, entered, promulgated or endorsed by
     any court or governmental authority of competent jurisdiction or any self-
     regulatory organization having authority over the matters contemplated
     hereby which restricts or prohibits the consummation of any of the
     transactions contemplated by this Agreement.

                                   ARTICLE 7
                CONDITIONS TO PURCHASER'S OBLIGATION TO PURCHASE

          7.1  Conditions to the Closing.  The obligation of the Purchaser
               -------------------------
hereunder to purchase the Convertible Securities and the Warrant to be purchased
by it on the Closing Date is subject to the satisfaction of each of the
following conditions, provided that these conditions are for the Purchaser's
sole benefit and may be waived by the Purchaser at any time in the Purchaser's
sole discretion:

               (a) The Company shall have executed the signature page to this
     Agreement, the Warrant and the Registration Rights Agreement and delivered
     the same to the Purchaser.

               (b) The Company shall have delivered a duly executed Note (in
     such denominations as the Purchaser shall request) being so purchased by
     the Purchaser at the Closing.

               (c) The Common Stock, including all Conversion Shares and Warrant
     Shares, shall be listed on The Nasdaq Small Cap Market and the Company
     shall use its best efforts to become listed on the Nasdaq National Market
     System or the New York Stock Exchange (individually or collectively,
     "Exchange") and trading in the Common Stock shall not have been suspended
     by the Exchange, the SEC or any other regulatory authority and no de-
     listing or suspension shall be reasonably likely to occur in the judgment
     of the Purchaser for the foreseeable future.

               (d) The representations and warranties of the Company shall be
     true and correct as of the date when made and as of the Closing as though
     made at that time and the Company shall have performed, satisfied and
     complied with the covenants and agreements required by this Agreement to be
     performed or complied with by the Company at or prior to the Closing.  The
     Purchaser shall have received a certificate, executed by the Chief
     Executive Officer or Chief Financial Officer of the Company, dated
<PAGE>

     as of the Closing to the foregoing effect and as to such other matters as
     may be reasonably requested by the Purchaser.

               (e) No statute, rule, regulation, executive order, decree, ruling
     or injunction shall have been enacted, entered, promulgated or endorsed by
     any court or governmental authority of competent jurisdiction or any self-
     regulatory organization having authority over the matters contemplated
     hereby which prohibits the consummation of any of the transactions
     contemplated by this Agreement.

               (f) The Purchaser shall have received the officer's certificate
     described in Section 3.3, dated as of the Closing.

               (g) The Purchaser shall have received an opinion of the Company's
     counsel, dated as of the Closing, in the form attached hereto as Exhibit E.
                                                                      ---------

               (h) The Company's transfer agent has agreed to act in accordance
     with irrevocable instructions in the form attached hereto as Exhibit F.
                                                                  ---------

               (i) [intentionally omitted]

               (j) No event has occurred which constitutes an Event of Default
     (as defined in the Note) or an event of default under any capitalized lease
     or which would constitute an Event of Default or an event of default under
     any capitalized lease with notice or the passage of time or both which have
     not been cured or waived to the satisfaction of the Purchaser.

               (k) The Company has timely filed an application for listing of
     additional shares as required under the rules of Nasdaq or has obtained an
     effective waiver of such requirement.

                                   ARTICLE 8
                             ADDITIONAL COVENANTS

          8.1  Effect.  Except as specifically provided below, the provisions of
               ------
this Article VIII will remain in effect until the earliest of the following to
occur:  (i) the Note is paid in full, (ii) the Note is terminated in connection
with a Financing (as defined in Section 4.5), and (iii) six months from the date
of this Agreement.

          8.2  Definitions.  For purposes of this Article VIII, the following
               -----------
terms shall have the indicated meaning:
<PAGE>

               "Affiliate" means (i) any officer, director or shareholder of the
                ---------
     Company or any of its subsidiaries, (ii) any corporation or any other
     person or entity that directly or indirectly, through one or more
     intermediaries, controls or is controlled by or is under common control
     with the Company or any of its subsidiaries or (iii) any officer, director,
     trustee, partner or shareholder of any corporation or any other person or
     entity that directly or indirectly, through one or more intermediaries,
     controls or is controlled by or is under common control with the Company or
     any of its subsidiaries.

               "Employee Plan" includes any pension, retirement, disability,
                -------------
     medical, dental or other health plan, life insurance or other death benefit
     plan, profit sharing, deferred compensation, stock option, bonus or other
     incentive plan, vacation benefit plan, severance plan, or other employee
     benefit plan or arrangement, including, without limitation, those pension,
     profit-sharing and retirement plans of the Company and each of its
     subsidiaries and any pension plan, welfare plan, Defined Benefit Pension
     Plans (as defined in the Employee Retirement Income Security Act of 1974,
     as amended from time to time ("ERISA")) or any multi-employer plan,
                                    -----
     maintained or administered by the Company or any of its subsidiaries to
     which the Company or any of its subsidiaries is a party or may have any
     liability or by which the Company or any of its subsidiaries is bound.

               "Environmental Laws" means all federal, state and local Laws
                ------------------
     (including, without limitation, the common law), statutes, ordinances,
     rules, regulations and other requirements (including, without limitation,
     administrative orders, consent agreements and conditions contained in the
     applicable permits), relating to health, safety or the protection of the
     environment, including, without limitation, the Comprehensive Environmental
     Response, Compensation and Liability Act ("CERCLA"), 42 U.S.C. ss. 9601 et
                                                ------
     seq., the Resource Conservation and Recovery Act ("RCRA"), 42 U.S.C. ss.
                                                        ----
     6901 et seq., and the Clean Air Act 42.  U.S.C. ss. 7401 et seq., as
     amended or hereafter amended.

               "Information Technology" means, with respect to a person or
                ----------------------
     entity, all systems, software, hardware, information technology, microcode,
     embedded chips, and all electronic or electronically controlled systems,
     machinery or components reliant on or included within the foregoing, which
     are owned, leased, licensed or used by such person or entity, including,
     without limitation, items of the foregoing description related to the
     facilities, equipment, manufacturing and order entry processes, quality
     control activities, accounting and bookkeeping, records and record-keeping
     activities of such person or entity.
<PAGE>

          "Year 2000 Compliant" means (i) with respect to data that includes
           -------------------
     date or time information or that is otherwise derived from or dependent
     upon date or time information ("Date Data"), that such data is in proper
                                     ---------
     format and accurate for all dates and times (A) from, into and between the
     twentieth and twenty-first centuries, (B) from and into date values
     representing September 9, 1999, and (C) for date values representing dates
     during leap years, and (ii) with respect to all Information Technology of a
     Person, that such Information Technology accurately processes (including,
     without limitation, calculating, receiving, comparing, sequencing, storing,
     transmitting or displaying) Date Data, including processing such data
     described in clauses (A) through (C) of clause (i) hereof, without loss of
     any functionality or performance, when used as a stand-alone system or in
     combination with other software, hardware, system, component, equipment,
     embedded chips or other information technology.

     8.3  Intentionally omitted.
          ---------------------

     8.4  Financial Information and Reporting.  The Company shall cause to be
          -----------------------------------
furnished to the Purchaser:

          (a) As soon as practicable and, in any event, within ninety (90) days
     after the end of each of the Company's fiscal years, beginning with the
     fiscal year ending December 31, 1999, a written statement of such Company's
     independent certificated public accountant (i) that in performing the audit
     such accountant has not obtained knowledge of any Event of Default or
     disclosing all Events of Default of which it has obtained knowledge and
     (ii) that such accountant and is aware that the Purchaser is relying on
     such accountant's certification, together with a copy of Company's 10-KSB,
     as filed with the SEC;

          (b) Together with the delivery of the Company's 10-QSB and 10-KSB
     required to be delivered under this Agreement, a certificate of the Company
     executed by an authorized officer of the Company stating whether any Event
     of Default or any event which, with the passage of time or giving of notice
     or both, would constitute such an Event of Default currently exists and is
     continuing and what action, if any, the Company and/or any of its
     subsidiaries is taking or propose to take with respect thereto; and

          (c) Promptly (but in any event within five business days) after the
     occurrence of a Material Adverse Effect or a prepayment event under the
     Note, written notice thereof (together with simultaneous public disclosure
     thereof if not previously made).

     8.5  Intentionally omitted.
          ---------------------
<PAGE>

          8.6  Corporate Existence.  The Company and each of its material
               -------------------
subsidiaries shall maintain and preserve their corporate existence, good
standing, certificates of authority, licenses, permits, franchises, patents,
trademarks, trade names, service marks, copyrights, leases and all other
contracts and rights necessary or desirable to continue their operations and
business as now conducted and will generally continue its existing lines of
business or such businesses as are substantially related to those being
presently conducted by the Company and its material subsidiaries.

          8.7  Taxes and Laws.  The Company and each of its subsidiaries will
               --------------
pay when due all taxes, including excise taxes and duty, assessments, charges
and levies imposed on the Company and each of its subsidiaries or any of their
income, profits, property or assets, or which they are required to withhold and
pay out, and will comply with all applicable present and future laws unless the
Company or any of its affiliates is contesting in good faith, by an appropriate
proceeding, the validity, amount or imposition of the above, subject to
appropriate reserves, and such contest does not have or cause a Material Adverse
Effect or impair the Company or any of its affiliates ability to perform any of
its material obligations.

          8.8  Repair and Maintenance.  The Company and each of its subsidiaries
               ----------------------
will maintain all of their assets and properties in good condition and repair
and in proper working order, normal wear and tear excepted, and will pay and
discharge, or cause to be paid and discharged, when due, the cost of repairs,
replacement or maintenance to the foregoing and all rentals or mortgage payments
on the foregoing.  Notwithstanding the foregoing, the Company may determine not
to repair and maintain certain of its asset(s) so long as such determination and
failure to repair and maintain such asset(s) shall not have a Material Adverse
Effect on the business of the Company and its subsidiaries, taken as a whole.

          8.9   Intentionally omitted.
                ---------------------

          8.10  Employee Plans.  The Company and each of its subsidiaries shall
                --------------
(i) keep in full force and effect any and all Employee Plans which are presently
in existence or may, from time to time, come into existence under ERISA, and not
withdraw from any such Employee Plans, unless such withdrawal can be effected or
such Employee Plans can be terminated without material liability to the Company
and each of its subsidiaries; (ii) make contributions to all of such Employee
Plans in a timely manner and in a sufficient amount to comply with the
requirements of ERISA, including the minimum funding standards of Section 302 of
ERISA; (iii) comply with all material requirements of ERISA which relate to such
Employee Plans; (iv) notify the Purchaser immediately upon receipt by the
Company or any of its subsidiaries of any notice concerning the imposition of
any withdrawal liability or of the institution of any proceeding or other action
which may result in the termination of any such Employee Plans or the
appointment of a trustee to administer such Employee Plans; and (v) promptly
advise the Purchaser of the occurrence of any Reportable Event or Prohibited
Transaction that is not exempt by statute, as defined in ERISA, with respect to
any such Employee Plans.
<PAGE>

          8.11  Intentionally deleted.
                ---------------------

          8.12  Environmental Matters - Indemnification.  The Company and each
                ---------------------------------------
of its subsidiaries shall take or cause to be taken all actions to comply in all
material respects with the requirements of all Environmental Laws including,
without limitation, all filing and reporting requirements thereof.  The Company
hereby agrees to indemnify, hold harmless and reimburse the Purchaser for any
and all loss, damage, expenses or costs of any kind or nature arising out of or
incurred in connection with any prior, existing or future violations by the
Company and each of its subsidiaries of any Environmental Laws.

          8.13  Transfer of Assets.  The Company and each of its subsidiaries
                ------------------
shall not sell, lease, transfer or otherwise dispose of any of their assets,
properties or rights, except in the ordinary course of business consistent with
past practice or to the extent such assets or property and/or rights to transfer
are not individually or in the aggregate material to the Company and its
subsidiaries taken as a whole.

          8.14  Investments and Loans.  The Company shall not make any loans to
                ---------------------
or investments in any person or entity, including any officer, director or
employee, except that the Company may make a loan to or invest in a wholly-owned
subsidiary of the Company.

          8.15  Prepayment or Modification of Indebtedness; New Indebtedness.
                ------------------------------------------------------------
The Company and each of its subsidiaries will not (i) prepay any indebtedness
for money borrowed or any indebtedness secured by any of their assets (except
for obligations under a capital lease), (ii) enter into or modify any agreement
as a result of which the terms of payment of any of the foregoing indebtedness
are amended or modified in a manner which would accelerate its payment, or (iii)
enter into any note or other arrangement which would result in, or otherwise
incur, additional indebtedness in an amount in excess of one hundred thousand
dollars ($100,000.00).

          8.16  Transactions with Affiliates.  The Company and each of its
                ----------------------------
subsidiaries will not enter into any agreement or arrangement, written or oral,
directly or indirectly, with an Affiliate, or provide services or sell goods to,
or for the benefit of, or pay or otherwise distribute monies, goods or other
valuable consideration to, an Affiliate, except upon fair and reasonable terms
no less favorable to the Company and each of its subsidiaries than terms in a
comparable arm's length transaction with an unaffiliated person or entity and
except for existing intercompany debt.

          8.17  Guarantees.  The Company and each of its subsidiaries shall not
                ----------
guarantee, assume, endorse or otherwise, in any way, become directly or
contingently liable in any manner with respect to the obligations or liabilities
of any other person or entity, except by endorsement of instruments or items for
payment or deposit or collection.

          8.18  Capital Structure.  The Company and each of its subsidiaries
                -----------------
shall not make any material change in their capital structures, enter into any
new business or make
<PAGE>

any material change in their business objectives, purposes and operations, any
of which would have a Material Adverse Effect.

          8.19  Leases.  Except for those leases currently contemplated by the
                ------
Company and which are fully set forth in Schedule 8.19 of this Agreement, the
Company and each of its subsidiaries shall not incur or permit to exist (i) any
obligations under any operating leases other than leases having an aggregate
rent not in excess of Two Hundred Fifty Thousand $250,000 per fiscal year, and
(ii) any indebtedness with respect to purchase money indebtedness and
obligations with respect to leases which have been, or, in accordance with GAAP,
should be, recorded as capitalized leases, for which the Company and each of its
subsidiaries are obligated to pay in excess of Two Hundred and Fifty Thousand
Dollars ($250,000) in the aggregate at any time ("Permitted Liens").

          8.20  Capital Expenditures.  The Company and each of its subsidiaries
                --------------------
shall not make or incur any capital expenditures in excess of One Million
Dollars ($1,000,000.00) in any fiscal year.

          8.21  Limitation of Agreements.  The Company will not, and will not
                ------------------------
permit any subsidiary to, enter into any contract, or any amendment,
modification, extension or supplement to any existing contract, which
contractually prohibits the Company from paying interest on, or principal of,
the Notes or effecting the conversion of the Notes.

          8.22  Compliance Certification.  At the end of each quarter of the
                ------------------------
Company's fiscal year, the Company shall deliver to each Purchaser a certificate
of an authorized financial officer of the Company regarding compliance by the
Company with the covenants set forth herein and certifying that no default under
this Agreement, default or Event of Default under the Loan Agreement, or default
or Event of Failure under the Debentures shall have occurred and be continuing.

          8.23  Notice of Breach.  As promptly as practicable, and in any event
                ----------------
not later than five business days after senior management of the Company becomes
aware thereof, the Company shall provide each Purchaser with written notice of
any breach by the Company of any provision of this Agreement, any Capital Lease,
any note representing indebtedness of the Company or any of its subsidiaries or
the Notes, including, without limitation, this Article VIII, specifying the
nature of such breach and any actions proposed to be taken by the Company to
cure such breach.

          8.24  Year 2000 Compliance.  All of Company's Information Technology
                --------------------
(as defined below), and, to the best of Company's knowledge, all Information
Technology of all parties with whom Company exchanges information electronically
("EDI Parties") (as defined below), significant suppliers and significant
customers, is and shall be Year 2000 Compliant (as defined below).  The Company
has developed (i) a testing and compliance program, and (ii) a contingency plan,
in each case regarding Year 2000-related matters pertaining to Company's
Information Technology and that of the EDI Parties.  Such program and plan, are
adequate to prevent a Material Adverse Effect upon the Company
<PAGE>

as a consequence of any Information Technology of the Company and/or the EDI
Parties not being Year 2000 Compliant from and after the date hereof through
March 31, 2001.

          8.25  Liens.  The Company shall not create or suffer to exist any Lien
                -----
upon any of its property now owned or hereafter acquired, or acquire any
property upon any conditional sale or other title retention device or
arrangement or any purchase money security agreement other than those Permitted
Liens provided for in Section 8.19(ii) or this Agreement.

                                   ARTICLE 9
                         GOVERNING LAW; MISCELLANEOUS

          9.1  Governing Law; Jurisdiction.  This Agreement shall be governed by
               ---------------------------
and construed in accordance with the laws of the State of New York applicable to
contracts made and to be performed in the State of New York.  The parties hereto
irrevocably consent to the jurisdiction of the United States federal courts
located in the State of New York in any suit or proceeding based on or arising
under this Agreement or the transactions contemplated hereby and irrevocably
agree that all claims in respect of such suit or proceeding may be determined in
such courts.  The Company irrevocably waives the defense of an inconvenient
forum to the maintenance of such suit or proceeding.  The Company further agrees
that service of process upon the Company mailed by the first class mail shall be
deemed in every respect effective service of process upon the Company in any
suit or proceeding arising hereunder.  Nothing herein shall affect the
Purchaser's right to serve process in any other manner permitted by law.  The
parties hereto agree that a final non-appealable judgment in any such suit or
proceeding shall be conclusive and may be enforced in other jurisdictions by
suit on such judgment or in any other lawful manner.

          9.2  Counterparts.  This Agreement may be executed in two or more
               ------------
counterparts, including, without limitation, by facsimile transmission, all of
which counterparts shall be considered one and the same agreement and shall
become effective when counterparts have been signed by each party and delivered
to the other party.  In the event any signature page is delivered by facsimile
transmission, the party using such means of delivery shall cause additional
original executed signature pages to be promptly delivered to the other parties.

          9.3  Headings.  The headings of this Agreement are for convenience of
               --------
reference and shall not form part of, or affect the interpretation of, this
Agreement.

          9.4  Severability.  If any provision of this Agreement shall be
               ------------
invalid or unenforceable in any jurisdiction, such invalidity or
unenforceability shall not affect the validity or enforceability of the
remainder of this Agreement or the validity or enforceability of this Agreement
in any other jurisdiction.

          9.5  Scope of Agreement; Amendments.  This Agreement and the documents
               ------------------------------
and instruments referenced herein contain the entire understanding of the
parties with
<PAGE>

respect to the matters covered herein and therein and, except as specifically
set forth herein, the Purchaser makes no representation, warranty, covenant or
undertaking with respect to the transactions contemplated hereby. No provision
of this Agreement may be waived other than by an instrument in writing signed by
the party to be charged with enforcement and no provision of this Agreement may
be amended other than by an instrument in writing signed by the Company and the
Purchaser.

          9.6  Notice.  Any notice herein required or permitted to be given
               ------
shall be in writing and may be personally served or delivered by courier or by
facsimile-machine confirmed telecopy, and shall be deemed delivered at the time
and date of receipt (which shall include telephone line facsimile transmission).
The addresses for such communications shall be:

               If to the Company:

               Online System Services, Inc.
               1800 Glenarm Place, Suite 700
               Denver, Colorado 80202
               Telecopy:  (303) 292-3059
               Attention:  William Cullen

               with a copy to:

               Gray, Plant, Mooty, Mooty & Bennett, P.A.
               3400 City Center
               33 South Sixth Street
               Minneapolis, MN 55402-3796
               Telecopy:  (612) 333-0066
               Attention:  Lindley S. Branson, Esq.

               If to the Purchaser:

               Castle Creek Technology Partners LLC
               c/o Castle Creek Partners LLC
               77 West Wacker Drive, Suite 4040
               Chicago, Illinois 60601
               Telecopy:  (312) 499-6999
               Attention:  Portfolio Manager

          Each party shall provide notice to the other party of any change in
address.

          9.7  Successors and Assigns.  This Agreement shall be binding upon and
               ----------------------
inure to the benefit of the parties and their successors and assigns.  Neither
the Company nor the Purchaser shall assign this Agreement or any rights or
obligations hereunder without the prior written consent of the other, which, in
the case of any consent required of the Company, shall not be unreasonably
withheld.  Notwithstanding the foregoing, the
<PAGE>

Purchaser may assign its rights and obligations hereunder and may transfer any
or all of its Securities to any of its "affiliates",as that term is defined
under the Exchange Act, without the consent of the Company so long as such
affiliate is an accredited investor. This provision shall not limit the
Purchaser's right to transfer the Securities pursuant to the terms of this
Agreement. In addition, and notwithstanding anything to the contrary contained
in this Agreement, the Convertible Securities, the Warrant or the Registration
Rights Agreement, the Securities may be pledged, and all rights of the Purchaser
under this Agreement or any other agreement or document related to the
transaction contemplated hereby may be assigned, without further consent of the
Company, to a bona fide pledgee in connection with the Purchaser's margin or
brokerage accounts.

          9.8   Third Party Beneficiaries.  This Agreement is intended for the
                -------------------------
benefit of the parties hereto and their respective permitted successors and
assigns and is not for the benefit of, nor may any provision hereof be enforced
by, any other person.

          9.9   Survival.  The representations, warranties, agreements and
                --------
covenants of the Company in this Agreement shall survive the Closing hereunder
notwithstanding any due diligence investigation conducted by or on behalf of the
Purchaser.  The Company agrees to indemnify and hold harmless the Purchaser and
each of the Purchaser's officers, directors, shareholders, members, employees,
partners, agents and affiliates and any direct or indirect investors,
shareholders, officers, directors, agents, partners, employees, members, agents
or affiliates of any of the foregoing for loss or damage arising as a result of
or related to (a) any breach by the Company of any of its representations or
covenants set forth herein or the unenforceability or invalidity of any
provision of any of the Investment Agreements, or (b) any cause of action, suit
or claim brought or made against such indemnitee (other than directly by the
Company solely for breach of this Agreement, the Warrant, the Note or the
Registration Rights Agreement by the indemnitee or by governmental or regulatory
authorities), and arising out of or resulting from (whether in whole or in part)
the execution, delivery, performance or enforcement of this Agreement or any
other Investment Agreements or any other instrument, document or agreement
executed pursuant hereto or thereto or contemplated hereby or thereby (including
without limitation the acquisition of the Convertible Securities, the Warrants,
the Convertible Shares, and/or the Warrant Shares), any transaction financed or
to be financed in whole or in part, directly or indirectly, with the proceeds of
the issuance of the Securities or the status of the Purchaser as an investor in
the Company, except to the extent that such actual loss or damage directly
results from a breach by such indemnitee of this Agreement, the Warrant, the
Note or the Registration Rights Agreement or from a violation of law.  The right
to indemnification shall include the right to advancement of expenses as they
are incurred.

          9.10  Public Filings; Publicity.  Immediately following execution of
                -------------------------
this Agreement, the Company shall issue a press release with respect to the
transactions contemplated hereby.  The Company and the Purchaser shall have the
right to approve before issuance any press releases (including the foregoing
press release), SEC or other filings, or any other public statements, with
respect to the transactions contemplated
<PAGE>

hereby; provided, however, that the Company shall be entitled, without the prior
approval of the Purchaser, to make any press release or SEC, Nasdaq, NASD or
exchange filings with respect to such transactions as is required by applicable
law and regulations (although the Purchaser shall (to the extent time permits)
be consulted by the Company in connection with any such press release prior to
its release and shall be provided with a copy thereof).

          9.11  Further Assurances.  Each party shall do and perform, or cause
                ------------------
to be done and performed, all such further acts and things, and shall execute
and deliver all such other agreements, certificates, instruments and documents,
as the other party may reasonably request in order to carry out the intent and
accomplish the purposes of this Agreement and the consummation of the
transactions contemplated hereby.

          9.12  Remedies.  No provision of this Agreement providing for any
                --------
remedy to the Purchaser shall limit any remedy which would otherwise be
available to the Purchaser at law or in equity.  Nothing in this Agreement shall
limit any rights the Purchaser may have with any applicable federal or state
securities laws with respect to the investment contemplated hereby.

          9.13  Directly or Indirectly.  Where any provision in this Agreement
                ----------------------
refers to action to be taken by any Person, or which such Person is prohibited
from taking, such provision shall be applicable whether the action in question
is taken directly or indirectly by such Person.

          9.14  Termination.  In the event that the Closing shall not have
                -----------
occurred by August 30, 1999, unless the parties agree otherwise, this Agreement
shall terminate.

          IN WITNESS WHEREOF, the undersigned Purchaser and the Company have
caused this Agreement to be duly executed as of the date first above written.

                                # # #
<PAGE>

[signature page to Securities Purchase Agreement]

COMPANY:

ONLINE SYSTEM SERVICES, INC.

By:  /s/ William R. Cullen
     -----------------------------------------
     Name:  William R. Cullen
            ----------------------------------
     Title:  EVP & CFO
             ---------------------------------



PURCHASER:

CASTLE CREEK TECHNOLOGY PARTNERS LLC

By:  CASTLE CREEK PARTNERS LLC
Its:  Managing Member

By:  /s/ John Ziegelman
     -----------------------------------------
     Name:  John Ziegelman
            ----------------------------------
     Title:  Managing Member
             ---------------------------------
<PAGE>

                         SECURITIES PURCHASE AGREEMENT
                         -----------------------------
                       SCHEDULE OF EXHIBITS AND SCHEDULES
                       ----------------------------------

EXHIBIT A       Note
EXHIBIT B       Warrant
EXHIBIT C       Registration Rights Agreement
EXHIBIT D       [Intentionally Omitted]
EXHIBIT E       Opinion of Counsel
EXHIBIT F       Irrevocable Instruction
EXHIBIT G       [Intentionally Omitted]
EXHIBIT H       Amendment to Capital Lease or other indebtedness, if applicable

SCHEDULE 3.3    Capitalization
SCHEDULE 3.6    Registration & SEC Documents
SCHEDULE 3.8    Litigation
SCHEDULE 3.17   Foreign Corrupt Practices
SCHEDULE 3.18   Key Employees
SCHEDULE 4.5    Stock Options
SCHEDULE 8.19   Leases
<PAGE>

                                                                EXHIBIT E to the
                                                                ---------
                                                        Stock Purchase Agreement

                               [FORM OF OPINION]

       [ATTACHED HERETO OPINION FROM GRAY PLANT, MOOTY, MOOTY & BENNETT]
<PAGE>

EXHIBIT F
to Securities Purchase Agreement

      [FORM OF IRREVOCABLE INSTRUCTION - SUBJECT TO REVIEW AND DISCUSSION]

                              [COMPANY LETTERHEAD]


                                August __, 1999

COMPANY
ADDRESS

Attn:  Stock Transfer Dept.

Ladies and Gentlemen:

Reference is made to that certain Securities Purchase Agreement (the "Securities
                                                                      ----------
Purchase Agreement"), a copy of which is enclosed, dated as of even date
- ------------------
herewith, by and between Online system Services, Inc., a Colorado corporation
(the "Company"), and the Purchasers set forth in the Securities Purchase
      -------
Agreement (the "Holders"), pursuant to which the Company is issuing to the
                -------
Holders the 10% Promissory Note, which are convertible into shares of Common
Stock ("Common Stock"), $________ par value per share, of the Company (such
        ------------
shares of Common Stock, the "Conversion Shares") and Warrants to acquire shares
                             -----------------
of Common Stock (such shares of Common Stock, the "Warrant Shares").  This
                                                   --------------
letter shall serve as our irrevocable authorization and direction to you with
respect to the issuance of Conversion Shares and the Warrant Shares.
Certificates for the Conversion Shares and the Warrant Shares shall not bear any
legend restricting their transfer and shall not be subject to any stop-transfer
restriction other than as permitted in Article V of the Securities Purchase
Agreement; provided, however, if the Conversion Shares and the Warrant Shares
are not registered for resale under the Securities Act of 1933, as amended,
then, subject to Article V of the Securities Purchase Agreement, the
certificates for the Conversion Shares and the Warrant Shares shall bear the
following legend (and only the following legend):

          THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN
          REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR THE
          SECURITIES LAWS OF ANY STATE OF THE UNITED STATES.  THE SECURITIES
          REPRESENTED HEREBY MAY NOT BE OFFERED OR SOLD OR OTHERWISE TRANSFERRED
          IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT FOR THE
          SECURITIES UNDER
<PAGE>

          APPLICABLE SECURITIES LAWS OR UNLESS OFFERED, SOLD OR
          TRANSFERRED PURSUANT TO AN AVAILABLE EXEMPTION FROM THE REGISTRATION
          REQUIREMENTS OF THOSE LAWS.

Please be advised that each Holder is relying upon this letter as an inducement
to enter into the Securities Purchase Agreement and, accordingly, it is agreed
that each Holder is a third party beneficiary of these instructions.  Moreover,
the Company cannot revoke or modify these instructions as to a particular Holder
(or its transferee) without the prior written consent of such Holder (or
transferee, as the case may be).  Please execute this letter in the space
indicated to acknowledge your agreement to act in accordance with these
instructions.  Should you have any questions concerning this matter, please
contact me at (___) ___-____.

                              Very truly yours,

                              ONLINE SYSTEM SERVICES, INC.


                              By:__________________________________________
                              Its:_________________________________________

Agreed and Acknowledged as of ________________:


____________________________

By:____________________________

Name:__________________________

Title:_________________________

Enclosures

                           cc:  [Initial Purchasers]
<PAGE>

                                   EXHIBIT A

                            Pro Forma Balance Sheet


[To be provided by the Company]
<PAGE>

EXHIBIT B
to Securities Purchase Agreement

VOID AFTER 5:00 P.M., CENTRAL TIME ON AUGUST 25, 2004

THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER
THE SECURITIES ACT OF 1933, AS AMENDED, OR THE SECURITIES LAWS OF ANY STATE OF
THE UNITED STATES.  THE SECURITIES REPRESENTED HEREBY MAY NOT BE OFFERED OR SOLD
OR OTHERWISE TRANSFERRED IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT
FOR THE SECURITIES UNDER APPLICABLE SECURITIES LAWS, OR UNLESS OFFERED, SOLD OR
TRANSFERRED PURSUANT TO AN AVAILABLE EXEMPTION FROM THE REGISTRATION
REQUIREMENTS OF THOSE LAWS.

                                             Right to Purchase 136,519 Shares of
                                                      Common Stock, no par value

Date:  August 25, 1999

                          ONLINE SYSTEM SERVICES, INC.
                             STOCK PURCHASE WARRANT

          THIS CERTIFIES THAT, for value received, Castle Creek Technology
Partners LLC ("Castle Creek"), or its registered assigns, is entitled to
               ------------
purchase from Online System Services, Inc., a Colorado corporation doing
business as Webb Interactive Services, Inc. (the "Company"), at any time or from
                                                  -------
time to time during the period specified in Section 2 hereof, 136,519 fully paid
and nonassessable shares of the Company's Common Stock, no par value (the
"Common Stock"), at an exercise price of $11.44 per share (the "Exercise
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Price").  This Warrant is being issued pursuant to that certain Securities
Purchase Agreement dated August 25, 1999 by and between the Company and Castle
Creek (the "Securities Purchase Agreement").  The number of shares of Common
            -----------------------------
Stock purchasable hereunder (the "Warrant Shares") and the Exercise Price are
                                  --------------
subject to adjustment as provided in Section 4 hereof.

          The term "Closing Bid Price" means, for any security as of any date,
                    -----------------
the closing bid price of such security on the principal securities exchange or
trading market where such security is listed or traded as reported by Bloomberg
Financial Markets or a comparable reporting service of national reputation
selected by the Company and reasonably acceptable to the holder hereof (the
"Holder") if Bloomberg Financial Markets is not then reporting closing bid
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prices of such security (collectively, "Bloomberg"), or if the foregoing does
                                        ---------
not apply, the last reported sale price of such security in the over-the-counter
market on the electronic bulletin board of such security as reported by
Bloomberg, or, if no sale price is reported for such security by Bloomberg, the
average of the bid prices of any market makers for such security as reported in
the "pink sheets" by the National Quotation Bureau, Inc. If the Closing Bid
Price cannot be calculated for such
<PAGE>

security on such date on any of the foregoing bases, the Closing Bid Price of
such security on such date shall be the fair market value as reasonably
determined by an investment banking firm selected by the Company and reasonably
acceptable to the Holder with the costs of such appraisal to be borne by the
Company.

          This Warrant is subject to the following terms, provisions, and
conditions:

          1.  Mechanics of Exercise.  Subject to the provisions hereof,
              ---------------------
including, without limitation, the limitations contained in Section 8(f) hereof,
this Warrant may be exercised as follows:

              (a) Manner of Exercise.  This Warrant may be exercised by the
                  ------------------
     Holder, in whole or in part, by the surrender of this Warrant (or evidence
     of loss, theft, destruction or mutilation thereof in accordance with
     Section 8(c) hereof), together with a completed exercise agreement in the
     Form of Exercise Agreement attached hereto as Exhibit 1 (the "Exercise
                                                                   --------
     Agreement"), to the Company at the Company's principal executive offices
     ---------
     (or such other office or agency of the Company as it may designate by
     notice to the Holder), and upon (i) payment to the Company in cash, by
     certified or official bank check or by wire transfer for the account of the
     Company, of the Exercise Price for the Warrant Shares specified in the
     Exercise Agreement or (ii) if the Holder elects to effect a Cashless
     Exercise (as defined in Section 12(c) below), delivery to the Company of a
     written notice of an election to effect a Cashless Exercise for the Warrant
     Shares specified in the Exercise Agreement.  The Warrant Shares so
     purchased shall be deemed to be issued to the Holder or Holder's designees,
     as the record owner of such shares, as of the date on which this Warrant
     shall have been surrendered, the completed Exercise Agreement shall have
     been delivered, and payment (or notice of an election to effect a Cashless
     Exercise) shall have been made for such shares as set forth above.

              (b) Issuance of Certificates.  Subject to Section 1(c),
                  ------------------------
     certificates for the Warrant Shares so purchased, representing the
     aggregate number of shares specified in the Exercise Agreement, shall be
     delivered to the Holder within a reasonable time, not exceeding three (3)
     business days, after this Warrant shall have been so exercised (the
     "Delivery Period").  The certificates so delivered shall be in such
     ----------------
     denominations as may be requested by the Holder and shall be registered in
     the name of Holder or such other name as shall be designated by such
     Holder.  If this Warrant shall have been exercised only in part, then,
     unless this Warrant has expired, the Company shall, at its expense, at the
     time of delivery of such certificates, deliver to the Holder a new Warrant
     representing the number of shares with respect to which this Warrant shall
     not then have been exercised.
<PAGE>

           (c)   Exercise Disputes. In the case of any dispute with respect to
                 -----------------
     an exercise, the Company shall promptly issue such number of shares of
     Common Stock as are not disputed in accordance with this Section. If such
     dispute involves the calculation of the Exercise Price, the Company shall
     submit the disputed calculations to a nationally recognized independent
     accounting firm (selected by the Company and reasonably acceptable to
     Holder) via facsimile within three (3) business days of receipt of the
     Exercise Agreement. The accounting firm shall audit the calculations and
     notify the Company and the converting Holder of the results no later than
     two (2) business days from the date it receives the disputed calculations.
     The accounting firm's calculation shall be deemed conclusive, absent
     manifest error. The Company shall then issue the appropriate number of
     shares of Common Stock in accordance with this Section.

           (d)   Fractional Shares.  No fractional shares of Common Stock are
                 -----------------
     to be issued upon the exercise of this Warrant, but the Company shall pay a
     cash adjustment in respect of any fractional share which would otherwise be
     issuable in an amount equal to the same fraction of the Exercise Price of a
     share of Common Stock (as determined for exercise of this Warrant into
     whole shares of Common Stock); provided that in the event that sufficient
     funds are not legally available for the payment of such cash adjustment any
     fractional shares of Common Stock shall be rounded up to the next whole
     number.

     2.    Period of Exercise.  This Warrant is exercisable at any time and from
           ------------------
time to time on or after the date hereof and before 5:00 P.M., Central Standard
Time on the fifth (5th) anniversary of the date hereof (the "Exercise Period").
                                                             -------- ------

     3.    Certain Agreements of the Company. The Company hereby covenants and
           ---------------------------------
agrees as follows:

           (a)   Shares to be Fully Paid. All Warrant Shares will, upon issuance
                 -----------------------
         in accordance with the terms of this Warrant, be validly issued, fully
         paid, and non-assessable and free from all taxes, liens, claims and
         encumbrances.

           (b)   Reservation of Shares. During the Exercise Period, the Company
                 ---------------------
     shall at all times have authorized, and reserved for the purpose of
     issuance upon exercise of this Warrant, a sufficient number of shares of
     Common Stock to provide for the exercise of this Warrant.

           (c)   Listing.  The Company shall promptly secure the listing of
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     the shares of Common Stock issuable upon exercise of this Warrant upon the
     Nasdaq Small Cap Market ("Nasdaq") and use its best efforts to secure the
                               ------
     listing of its securities on the Nasdaq National Market System, or the
<PAGE>

     New York Stock Exchange, as required by Section 4.9 of the Securities
     Purchase Agreement and upon each such national securities exchange or
     automated quotation system, if any, upon which shares of Common Stock are
     then listed or become listed and shall maintain, so long as any other
     shares of Common Stock shall be so listed, such listing of all shares of
     Common Stock from time to time issuable upon the exercise of this Warrant;
     and the Company shall so list on each national securities exchange or
     automated quotation system, as the case may be, and shall maintain such
     listing of any other shares of capital stock of the Company issuable upon
     the exercise of this Warrant so long as any shares of the same class shall
     be listed on such national securities exchange or automated quotation
     system.

         (d) Certain Actions Prohibited.  The Company will not, by amendment of
             --------------------------
     its charter or through any reorganization, transfer of assets,
     consolidation, merger, dissolution, issue or sale of securities, or any
     other voluntary action, avoid or seek to avoid the observance or
     performance of any of the terms to be observed or performed by it
     hereunder, but will at all times in good faith assist in the carrying out
     of all the provisions of this Warrant and in the taking of all such actions
     as may reasonably be requested by the Holder of this Warrant in order to
     protect the exercise privilege of the Holder of this Warrant, consistent
     with the tenor and purpose of this Warrant. Without limiting the generality
     of the foregoing, the Company (i) will not increase the par value of any
     shares of Common Stock receivable upon the exercise of this Warrant above
     the Exercise Price then in effect, and (ii) will take all such actions as
     may be necessary or appropriate in order that the Company may at all times
     validly and legally issue fully paid and nonassessable shares of Common
     Stock upon the exercise of this Warrant.

     4.  Antidilution Provisions.  During the Exercise Period, the Exercise
         -----------------------
Price and the number of Warrant Shares shall be subject to adjustment from time
to time as provided in this Section 4.  In the event that any adjustment of the
Exercise Price as required herein results in a fraction of a cent, such Exercise
Price shall be rounded up or down to the nearest cent.

         (a)     Adjustment of Exercise Price and Number of Shares upon
                 ------------------------------------------------------
     Issuance of Common Stock.  Except as otherwise provided in Section 4(c) and
     ------------------------
     4(e) hereof, if and whenever after the initial issuance of this Warrant,
     the Company issues or sells, or in accordance with Section 4(b) hereof is
     deemed to have issued or sold, any shares of Common Stock for no
     consideration or for a consideration per share less than the greater of the
     then current Market Price (as herein defined) and the then current Exercise
     Price on the date of issuance (a "Dilutive Issuance"), then effective
                                       -----------------

<PAGE>

     immediately upon the Dilutive Issuance, the Exercise Price will be adjusted
     in accordance with the following formula:

                          E' = (E) (O + P/M) / (CSDO)

          where:

          E       =       the adjusted Exercise Price
          E       =       the then current Exercise Price;
          M       =       the greater of the then current Market Price and the
                          then current Exercise Price;
          O       =       the number of shares of Common Stock outstanding
                          immediately prior to the Dilutive Issuance;
          P       =       the aggregate consideration, calculated as set forth
                          in Section 4(b) hereof, received by the
                          Company upon such Dilutive Issuance; and
          CSDO    =       the total number of shares of Common Stock Deemed
                          Outstanding (as herein defined) immediately after the
                          Dilutive Issuance.

          (b)   Effect on Exercise Price of Certain Events.  For purposes of
                ------------------------------------------
     determining the adjusted Exercise Price under Section 4(a) hereof, the
     following will be applicable:

                (i) Issuance of Rights or Options.  If the Company in any manner
                    -----------------------------
          issues or grants any warrants, rights or options, whether or not
          immediately exercisable, to subscribe for or to purchase Common Stock
          or other securities exercisable, convertible into or exchangeable for
          Common Stock ("Convertible Securities"), but not to include the grant
                         ----------------------
          or exercise of any stock or options which may hereafter be granted or
          exercised under any employee or Director benefit plan of the Company
          now existing or to be implemented in the future, so long as the
          issuance of such stock or options is approved by a majority of the
          non-employee members of the Board of Directors of the Company or a
          majority of the members of a committee of non-employee directors
          established for such purpose (such warrants, rights and options to
          purchase Common Stock or Convertible Securities are hereinafter
          referred to as "Options"), and the price per share for which Common
                          -------
          Stock is issuable upon the exercise of such Options is less than the
          greater of the Exercise Price or the Market Price on the date of
          issuance ("Below Market Options"), then the maximum total number of
                     --------------------
          shares of Common Stock
<PAGE>

          issuable upon the exercise of all such Below Market Options (assuming
          full exercise, conversion or exchange of Convertible Securities, if
          applicable) will, as of the date of the issuance or grant of such
          Below Market Options, be deemed to be outstanding and to have been
          issued and sold by the Company for such price per share. For purposes
          of the preceding sentence, the price per share for which Common Stock
          is issuable upon the exercise of such Below Market Options is
          determined by dividing (i) the total amount, if any, received or
          receivable by the Company as consideration for the issuance or
          granting of such Below Market Options, plus the minimum aggregate
          amount of additional consideration, if any, payable to the Company
          upon the exercise of all such Below Market Options, plus, in the case
          of Convertible Securities issuable upon the exercise of such Below
          Market Options, the minimum aggregate amount of additional
          consideration payable upon the exercise, conversion or exchange
          thereof at the time such Convertible Securities first become
          exercisable, convertible or exchangeable, by (ii) the maximum total
          number of shares of Common Stock issuable upon the exercise of all
          such Below Market Options (assuming full conversion of Convertible
          Securities, if applicable). No further adjustment to the Exercise
          Price will be made upon the actual issuance of such Common Stock upon
          the exercise of such Below Market Options or upon the exercise,
          conversion or exchange of Convertible Securities issuable upon
          exercise of such Below Market Options.

               (ii) Issuance of Convertible Securities.
                    ----------------------------------

                    (1)   If the Company in any manner issues or sells any
               Convertible Securities, whether or not immediately convertible
               (other than where the same are issuable upon the exercise of
               Options) and the price per share for which Common Stock is
               issuable upon such exercise, conversion or exchange (as
               determined pursuant to Section 4(b)(ii)(B) if applicable) is less
               than the greater of the Market Price or the Exercise Price then
               in effect on the date of issuance, then the maximum total number
               of shares of Common Stock issuable upon the exercise, conversion
               or exchange of all such Convertible Securities will, as of the
               date of the issuance of such Convertible Securities, be deemed
<PAGE>

               to be outstanding and to have been issued and sold by the Company
               for such price per share. For the purposes of the preceding
               sentence, the price per share for which Common Stock is issuable
               upon such exercise, conversion or exchange is determined by
               dividing (i) the total amount, if any, received or receivable by
               the Company as consideration for the issuance or sale of all such
               Convertible Securities, plus the minimum aggregate amount of
               additional consideration, if any, payable to the Company upon the
               exercise, conversion or exchange thereof at the time such
               Convertible Securities first become exercisable, convertible or
               exchangeable, by (ii) the maximum total number of shares of
               Common Stock issuable upon the exercise, conversion or exchange
               of all such Convertible Securities. No further adjustment to the
               Exercise Price will be made upon the actual issuances of such
               Common Stock upon exercise, conversion or exchange of such
               Convertible Securities.

                     (2)   If the Company in any manner issues or sells any
               Convertible Securities with a fluctuating conversion or exercise
               price or exchange ratio (a "Variable Rate Convertible Security"),
                                           ----------------------------------
               then the price per share for which Common Stock is issuable upon
               such exercise, conversion or exchange for purposes of the
               calculation contemplated by Section 4(b)(ii)(A) shall be deemed
               to be the lowest price per share which would be applicable
               assuming that (1) all holding period and other conditions to any
               discounts contained in such Convertible Security have been
               satisfied, and (2) the Market Price on the date of issuance of
               such Convertible Security was 80% of the Market Price on such
               date (the "Assumed Market Price").
                          --------------------

               (iii)  Change in Option Price or Conversion Rate. Except for the
                      -----------------------------------------
       grant or exercise of any stock or options which may hereafter be granted
       or exercised under any employee or Director benefit plan of the Company
       now existing or to be implemented in the future, so long as the issuance
       of such stock or options is approved by a majority of the non-employee
       members of the Board of Directors of
<PAGE>

       the Company or a majority of the members of a committee of non-employee
       directors established for such purpose, if there is a change at any time
       in (i) the amount of additional consideration payable to the Company upon
       the exercise of any Options; (ii) the amount of additional consideration,
       if any, payable to the Company upon the exercise, conversion or exchange
       or any Convertible Securities; or (iii) the rate at which any Convertible
       Securities are convertible into or exchangeable for Common Stock (other
       than under or by reason of provisions designed to protect against
       dilution), the Exercise Price in effect at the time of such change will
       be readjusted to the Exercise Price which would have been in effect at
       such time had such Options or Convertible Securities still outstanding
       provided for such changed additional consideration or changed conversion
       rate, as the case may be, at the time initially granted, issued or sold.

               (iv) Treatment of Expired Options and Unexercised Convertible
                    --------------------------------------------------------
          Securities.  If, in any case, the total number of shares of Common
          ----------
          Stock issuable upon exercise of any Options or upon exercise,
          conversion or exchange of any Convertible Securities is not, in fact,
          issued and the rights to exercise such option or to exercise, convert
          or exchange such Convertible Securities shall have expired or
          terminated, the Exercise Price then in effect will be readjusted to
          the Exercise Price which would have been in effect at the time of such
          expiration or termination had such Options or Convertible Securities,
          to the extent outstanding immediately prior to such expiration or
          termination (other than in respect of the actual number of shares of
          Common Stock issued upon exercise or conversion thereof), never been
          issued.

               (v) Calculation of Consideration Received.  If any Common Stock,
                   -------------------------------------
          Options or Convertible Securities are issued, granted or sold for
          cash, the consideration received therefor for purposes of this Warrant
          will be the amount received by the Company therefor, before deduction
          of reasonable commissions, underwriting discounts or allowances or
          other reasonable expenses paid or incurred by the Company in
          connection with such issuance, grant or sale.  In case any Common
          Stock, Options or Convertible Securities are issued or sold for a
          consideration part or all of which shall be other than cash, the
          amount of the consideration other than cash received by the Company
          will
<PAGE>

          be the fair market value of such consideration except where such
          consideration consists of freely-tradeable securities, in which case
          the amount of consideration received by the Company will be the Market
          Price thereof as of the date of receipt. In case any Common Stock,
          Options or Convertible Securities are issued in connection with any
          merger or consolidation in which the Company is the surviving
          corporation, the amount of consideration therefor will be deemed to be
          the fair market value of such portion of the net assets and business
          of the non-surviving corporation as is attributable to such Common
          Stock, Options or Convertible Securities, as the case may be. The fair
          market value of any consideration other than cash or securities will
          be determined in the good faith reasonable business judgment of the
          Board of Directors.

               (vi) Exceptions to Adjustment of Exercise Price.  No adjustment
                    ------------------------------------------
          to the Exercise Price will be made (i) upon the exercise of any
          warrants, options or convertible securities issued and outstanding on
          the date hereof in accordance with the terms of such securities as of
          such date; (ii) upon the grant or exercise of any stock or options
          which may hereafter be granted or exercised under any employee or
          Director benefit plan of the Company now existing or to be implemented
          in the future, so long as the issuance of such stock or options is
          approved by a majority of the non-employee members of the Board of
          Directors of the Company or a majority of the members of a committee
          of non-employee directors established for such purpose; (iii) upon the
          issuance of the Conversion Shares (as defined in the Securities
          Purchase Agreement) or the Warrant in accordance with terms of the
          Securities Purchase Agreement; or (iv) upon the exercise of the
          Warrant.

          (c) Subdivision or Combination of Common Stock.  If the Company, at
              ------------------------------------------
     any time after the initial issuance of this Warrant, subdivides (by any
     stock split, stock dividend, recapitalization, reorganization,
     reclassification or otherwise) its shares of Common Stock into a greater
     number of shares, then, after the date of record for effecting such
     subdivision, the Exercise Price in effect immediately prior to such
     subdivision will be proportionately reduced.  If the Company, at any time
     after the initial issuance of this Warrant, combines (by reverse stock
     split, recapitalization, reorganization, reclassification or otherwise) its
     shares of Common Stock into a smaller number of shares, then, after the
     date of
<PAGE>

     record for effecting such combination, the Exercise Price in effect
     immediately prior to such combination will be proportionately increased.

          (d)  Adjustment in Number of Shares.  Upon each adjustment of the
               ------------------------------
     Exercise Price pursuant to the provisions of this Section 4, the number of
     shares of Common Stock issuable upon exercise of this Warrant shall be
     adjusted by multiplying a number equal to the Exercise Price in effect
     immediately prior to such adjustment by the number of shares of Common
     Stock issuable upon exercise of this Warrant immediately prior to such
     adjustment and dividing the product so obtained by the adjusted Exercise
     Price.

          (e)  Major Transactions.  If the Company shall consolidate or
               ------------------
     merge with any other corporation or entity (other than a consolidation or
     merger in which the Company is the surviving or continuing entity and its
     capital stock is unchanged and unissued in such transaction (except for
     issuances which do not exceed fifty percent (50%) of the Common Stock)) or
     there shall occur any share exchange pursuant to which all of the
     outstanding shares of Common Stock are converted into other securities or
     property or any such other reclassification or change of the outstanding
     shares of Common Stock or the Company shall sell all or substantially all
     of its assets (each of the foregoing being a "Major Transaction"), then the
                                                   -----------------
     holder of this Warrant may, at its option, either (a) in the event that the
     Common Stock remains outstanding or holders of Common Stock receive any
     common stock or substantially similar equity interest, in each of the
     foregoing cases which is publicly traded, retain this Warrant and this
     Warrant shall continue to apply to such Common Stock or shall apply, as
     nearly as practicable, to such other common stock or equity interest, as
     the case may be, or (b) regardless of whether (a) applies, receive
     consideration, in exchange for this Warrant (without payment of any
     exercise price hereunder), equal to the greater of, as determined in the
     sole discretion of such holder, (i) the number of shares of stock or
     securities or property of the Company, or of the entity resulting from such
     Major Transaction (the "Major Transaction Consideration"), to which a
                             -------------------------------
     holder of the number of shares of Common Stock delivered upon the exercise
     of this Warrant (pursuant to the cashless exercise feature hereof) would
     have been entitled upon such Major Transaction had such holder so exercised
     this Warrant (without regard to any limitations on exercise herein or
     elsewhere contained) on the trading date immediately preceding the public
     announcement of the transaction resulting in such Major Transaction and had
     such Common Stock been issued and outstanding and had such Holder been the
     holder of record of such Common Stock at the time of the consummation of
     such Major Transaction, and (ii) cash paid by the Company in immediately
     available funds in an amount equal to the Black-Scholes Amount (as defined
     herein) times the number of shares of
<PAGE>

     Common Stock for which this Warrant was exercisable (without regard to any
     limitations on exercise herein contained and assuming payment of the
     exercise payment in cash hereunder) but in no event shall such amount
     exceed the Black Scholes value of the Warrant as of the Closing Date as
     determined by the Company's Auditors, and the Company shall make lawful
     provision for the foregoing as a part of such Major Transaction and shall
     cause the issuer of any security in such transaction which constitutes
     Registrable Securities under that certain Registration Rights Agreement
     dated August 25, 1999 by and between the Company and Castle Creek (the
     "Registration Rights Agreement") to assume all of the Company's obligations
      -----------------------------
     under the Registration Rights Agreement. In the event that the Company
     shall consolidate or merge with any other corporation in a transaction in
     which common stock of the surviving corporation or the parent thereof (the
     "Exchange Securities") is issued to the holders of Common Stock in such
     transaction in exchange for all such Common Stock, and (a) the Exchange
     Securities are publicly traded, (b) the average daily dollar trading volume
     of the Exchange Securities during the one hundred eighty (180) day period
     ending on the date on which such transaction is publicly disclosed is
     greater than One Million Dollars ($1,000,000.00) per day as reported by
     Bloomberg, (c) the historical one hundred (100) day volatility of the
     Exchange Securities during the period ending on the date on which such
     transaction is publicly disclosed is greater than fifty percent (50%), and
     (d) the market capitalization of the issuer of the Exchange Securities is
     not less than One hundred Million Dollars ($100,000,000.00) based on the
     last sale price of the Exchange Securities on the date immediately before
     the date on which such transaction is publicly disclosed (in each case,
     with respect to the foregoing clauses (a) through (d), as reported by
     Bloomberg), then the provisions of clause (b) of the preceding sentence
     shall not apply. In the event that the Company shall, in a Major
     Transaction, consolidate or merge with any other corporation in a
     transaction in which the Company is the survivor (a "Company Transaction"),
                                                          -------------------
     the provisions of clause (ii) of the second preceding sentence shall not
     apply to the extent that each of the following conditions remain true for
     the thirty (30) business days commencing as of the date of the consummation
     of such transaction (the "Measurement Period"): (a) the Common Stock
                               ------------------
     remains publicly traded during the period, (b) the average daily dollar
     trading volume of the Common Stock is greater than One Million Dollars
     ($1,000,000.00), (c) the historical thirty (30) day volatility of the
     Company's Common Stock is greater than fifty percent (50%), and (d) the
     market capitalization of the Company is not less than One Hundred Million
     Dollars ($1,000,000.00) on the last day of the period (in each case, with
     respect to the foregoing clauses (a) through (d), as reported by Bloomberg.
     No sooner than ten (10) business days nor later than five (5) business days
     prior to the consummation of the Major Transaction, but not prior to the
     public
<PAGE>

     announcement of such Major Transaction, the Company shall deliver written
     notice ("Notice of Major Transaction") to each holder of a Warrant, which
              ---------------------------
     Notice of Major Transaction shall be deemed to have been delivered one (1)
     business day after the Company's sending such notice by telecopy (provided
     that the Company sends a confirming copy of such notice on the same day by
     overnight courier) of such Notice of Major Transaction. Such Notice of
     Major Transaction shall indicate the amount and type of the Major
     Transaction consideration which such holder of a Warrant would receive
     under this Section. If the Major Transaction Consideration is cash and does
     not consist entirely of United States currency, such holder may elect to
     receive United States currency in an amount equal to the value of the Major
     Transaction Consideration in lieu of the Major Transaction Consideration by
     delivering notice of such election to the Company within five (5) business
     days of such holder's receipt of the Notice of Major Transaction.

               The "Black-Scholes Amount" shall be the amount determined by
                    --------------------
     calculating the "Black-Scholes" value of an option to purchase one share of
     Common Stock on the applicable page on the Bloomberg online page, using the
     following variable values:  (i) the current market price of the Common
     Stock equal to the closing trade price on the last trading day before the
     date of the Notice of the Major Transaction; (ii) volatility of the Common
     Stock equal to the volatility of the common Stock during the 100 trading
     day period preceding the date of the Notice of the Major Transaction; (iii)
     a risk free rate equal to the interest rate on the United States treasury
     bill or treasury note with a maturity corresponding to the remaining term
     of this Warrant on the date of the Notice of the Major Transaction; and
     (iv) an exercise price equal to the Exercise Price on the date of the
     Notice of the Major Transaction.  In the event such calculation function is
     no longer available utilizing the Bloomberg online page, the Holder shall
     calculate such amount in its sole discretion using the closest available
     alternative mechanism and variable values to those available utilizing the
     Bloomberg online page for such calculation function.

               (f) Distribution of Assets.  In case the Company shall declare or
                   ----------------------
     make any distribution of its assets (or rights to acquire its assets) to
     holders of Common Stock as a partial liquidating dividend, by way of return
     of capital or otherwise (including any dividend or distribution to the
     Company's shareholders of cash or shares (or rights to acquire shares) of
     capital stock of a subsidiary) (a "Distribution"), at any time after the
                                        ------------
     initial issuance of this Warrant, then the Holder shall be entitled upon
     exercise of this Warrant for the purchase of any or all of the shares of
     Common Stock subject hereto, to receive the amount of such assets (or
     rights) which would have been payable to the Holder had such Holder been
     the holder of
<PAGE>

     such shares of Common Stock on the record date for the determination of
     shareholders entitled to such Distribution.

               (g) Special Adjustment and Notices of Adjustment.  Upon the
                   --------------------------------------------
     occurrence of any event which requires any adjustment of the Exercise
     Price, then, and in each such case, the Company shall give notice thereof
     to the Holder, which notice shall state the Exercise Price resulting from
     such adjustment and the increase or decrease in the number of Warrant
     Shares purchasable at such price upon exercise, setting forth in reasonable
     detail the method of calculation and the facts upon which such calculation
     is based.  Such calculation shall be certified by the chief financial
     officer of the Company.  If the Company takes any actions (including under
     or by virtue of Section 4 of the Warrant) which would have a dilutive
     effect on the Holder or which would materially and adversely affect the
     Holder with respect to its investment in the Warrant, and if the provisions
     of Section 4 of the Warrant, are not strictly applicable to such actions
     or, if applicable to such actions, would not operate to equitably protect
     the Holder against such actions, then the Company shall promptly upon
     notice from Holder appoint its independent certified public accountants to
     determine as promptly as practicable an appropriate adjustment to the terms
     hereof, including without limitation adjustments to the Exercise Price, or
     another appropriate action to so equitably protect such Holder and prevent
     any such dilution and any such material adverse effect, as the case may be.
     Following such determination, the Company shall forthwith make the
     adjustments or take the other actions described therein.

               (h) Minimum Adjustment of Exercise Price.  No adjustment of the
                   ------------------------------------
     Exercise Price shall be made in an amount of less than 1% of the Exercise
     Price in effect at the time such adjustment is otherwise required to be
     made, but any such lesser adjustment shall be carried forward and shall be
     made at the time and together with the next subsequent adjustment which,
     together with any adjustments so carried forward, shall amount to not less
     than 1% of such Exercise Price.

               (i)  [Intentionally Omitted]

               (h) Other Notices.  In case at any time:
                   -------------

               (i) the Company shall declare any dividend upon the Common Stock
          payable in shares of stock of any class or make any other distribution
          to the holders of the Common Stock;

               (ii) the Company shall offer for subscription pro rata to the
          holders of the Common Stock any additional shares of stock of any
          class or other rights;
<PAGE>

               (iii)  there shall be any capital reorganization of the Company,
          or reclassification of the Common Stock, or consolidation or merger of
          the Company with or into, or sale of all or substantially all of its
          assets to, another corporation or entity; or

               (iv) there shall be a voluntary or involuntary dissolution,
          liquidation or winding-up of the Company;

     then, in each such case, the Company shall give to the Holder (a) notice of
     the date on which the books of the Company shall close or a record shall be
     taken for determining the holders of Common Stock entitled to receive any
     such dividend, distribution, or subscription rights or for determining the
     holders of Common Stock entitled to vote in respect of any such
     reorganization, reclassification, consolidation, merger, sale, dissolution,
     liquidation or winding-up and (b) in the case of any such reorganization,
     reclassification, consolidation, merger, sale, dissolution, liquidation or
     winding-up, notice of the date (or, if not then known, a reasonable
     approximation thereof by the Company) when the same shall take place.  Such
     notice shall also specify the date on which the holders of Common Stock
     shall be entitled to receive such dividend, distribution, or subscription
     rights or to exchange their Common Stock for stock or other securities or
     property deliverable upon such reorganization, reclassification,
     consolidation, merger, sale, dissolution, liquidation, or winding-up, as
     the case may be.  Such notice shall be given at least thirty (30) days
     prior to the record date or the date on which the Company's books are
     closed in respect thereto, but in no event earlier than public announcement
     of such proposed transaction or event.  Failure to give any such notice or
     any defect therein shall not affect the validity of the proceedings
     referred to in clauses (i), (ii), (iii) and (iv) above.

               (i)  Certain Definitions.
                    -------------------

                    (1)  "Common Stock Deemed Outstanding" shall mean the number
                          -------------------------------
          of shares of Common Stock actually outstanding (not including shares
          of Common Stock held in the treasury of the Company), plus (x) in case
          of any adjustment required by Section 4(a) resulting from the issuance
          of any Options, the maximum total number of shares of Common Stock
          issuable upon the exercise of the Options for which the adjustment is
          required (including any Common Stock issuable upon the conversion of
          Convertible Securities issuable upon the exercise of such Options),
          and (y) in the case of any adjustment required by Section 4(a)
          resulting from the issuance of any Convertible
<PAGE>

          Securities, the maximum total number of shares of Common Stock
          issuable upon the exercise, conversion or exchange of the Convertible
          Securities for which the adjustment is required, as of the date of
          issuance of such Convertible Securities, if any.

               (2) "Market Price," as of any date, (i) means the average of the
                    ------------
          Closing Bid Prices for the shares of Common Stock as reported to
          Nasdaq for the ten (10) trading days immediately preceding such date,
          or (ii) if Nasdaq is not the principal trading market for the Common
          Stock, the average of the last reported bid prices on the principal
          trading market for the Common Stock during the same period, or, if
          there is no bid price for such period, the last reported sales price
          for such period, or (iii) if market value cannot be calculated as of
          such date on any of the foregoing bases, the Market Price shall be the
          average fair market value as reasonably determined by an investment
          banking firm selected by the Company and reasonably acceptable to the
          Holders of a majority in interest of the Warrant, with the costs of
          the appraisal to be borne by the Company.  The manner of determining
          the Market Price of the Common Stock set forth in the foregoing
          definition shall apply with respect to any other security in respect
          of which a determination as to market value must be made hereunder.

               (3) "Common Stock," for purposes of this Section 4, includes the
                    ------------
          Common Stock and any additional class of stock of the Company having
          no preference as to dividends or distributions on liquidation,
          provided that the shares purchasable pursuant to this Warrant shall
          include only Common Stock in respect of which this Warrant is
          exercisable, or shares resulting from any subdivision or combination
          of such Common Stock, or in the case of any reorganization,
          reclassification, consolidation, merger, or sale of the character
          referred to in Section 4(e) hereof, the stock or other securities or
          property provided for in such Section.

          (j)  Key Officer or Director Transfers.  If any Key Officer (as
               ---------------------------------
     defined below) or director (in each case, or any member of his/her family
     or any trust or other entity for the benefit of any member of his/her
     family), during the period beginning on the date of the Closing and ending
     on the date that is six (6) months after the Registration Statement
     required
<PAGE>

     pursuant to Section 2.1 of the Registration Rights Agreement is declared
     effective, and while a Key Officer or director, directly or indirectly,
     offers, sells, transfers, assigns, pledges, or otherwise disposes of any
     shares of Common Stock, or any securities directly or indirectly
     convertible into or exercisable or exchangeable for, or warrants, options
     or rights to purchase or acquire shares of Common Stock (all such
     securities, "Options") or enters into any agreement, contract, arrangement
     or understanding with respect to any such offer, sale, transfer,
     assignment, pledge or other disposition of any Common Stock or Options or
     provides or files any public notice, including pursuant to Rule 144 of the
     Securities Act, of a bona fide intent to dispose of a specified amount of
     Common Stock or Options (an "Executive Transfer"), then the Exercise Price
                                  ------------------
     shall be adjusted to be reduced by twenty (20%) percent of that Exercise
     Price calculated pursuant to this Agreement; provided, however that a Key
                                                  --------  -------
     Officer or director (and all such entities for the benefit of any member of
     his/her family, collectively) may in the aggregate sell during the six (6)
     month period following effectiveness of such Registration Statement up to
     ten percent (10%) of his/her total holdings as of the date hereof without
     triggering any adjustments pursuant to this section. For purposes of this
     Section, a Key Officer shall mean R. Steven Adams, Lindley S. Branson,
                -----------
     William R. Cullen, Perry Evans, Andre Durand, Gwenael Hagan and Simon
     Greenman and any individual who assumes or performs any of the duties of
     any Key Officer.

           5.  Intentionally omitted.
               ---------------------

           6.  Issue Tax.  The issuance of certificates for Warrant Shares upon
               ---------
the exercise of this Warrant shall be made without charge to the Holder or such
shares for any issuance tax or other costs in respect thereof, provided that the
Company shall not be required to pay any tax which may be payable in respect of
any transfer involved in the issuance and delivery of any certificate in a name
other than the Holder.

           7.  No Rights or Liabilities as a Shareholder. This Warrant shall not
               -----------------------------------------
entitle the Holder to any voting rights or other rights as a shareholder of the
Company. No provision of this Warrant, in the absence of affirmative action by
the Holder to purchase Warrant Shares, and no mere enumeration herein of the
rights or privileges of the Holder, shall give rise to any liability of the
Holder for the Exercise Price or as a shareholder of the Company, whether such
liability is asserted by the Company or by creditors of the Company.

           8.  Transfer, Exchange, Redemption and Replacement of Warrant.
               ---------------------------------------------------------

               a.  Restriction on Transfer.  This Warrant and the rights granted
                   -----------------------
     to the Holder are transferable, in whole or in part, upon surrender of this
     Warrant, together with a properly executed assignment in the Form
<PAGE>

     of Assignment attached hereto as Exhibit 2, at the office or agency of the
     Company referred to in Section 8(e) below, provided, however, that any
     transfer or assignment shall be subject to the provisions of Section 5.1
     and 5.2 of the Securities Purchase Agreement. Until due presentment for
     registration of transfer on the books of the Company, the Company may treat
     the registered holder hereof as the owner and holder hereof for all
     purposes, and the Company shall not be affected by any notice to the
     contrary. Notwithstanding anything to the contrary contained herein, the
     registration rights described in Section 9 hereof are assignable only in
     accordance with the provisions of the Registration Rights Agreement.

               b.  Warrant Exchangeable for Different Denominations.  This
                   ------------------------------------------------
     Warrant is exchangeable, upon the surrender hereof by the Holder at the
     office or agency of the Company referred to in Section 8(e) below, for new
     Warrants, in the form hereof, of different denominations representing in
     the aggregate the right to purchase the number of shares of Common Stock
     which may be purchased hereunder, each of such new Warrants to represent
     the right to purchase such number of shares as shall be designated by the
     Holder of at the time of such surrender.

               c.  Replacement of Warrant.  Upon receipt of evidence reasonably
                   ----------------------
     satisfactory to the Company of the loss, theft, destruction, or mutilation
     of this Warrant or, in the case of any such loss, theft, or destruction,
     upon delivery, of an indemnity agreement reasonably satisfactory in form
     and amount to the Company, or, in the case of any such mutilation, upon
     surrender and cancellation of this Warrant, the Company, at its expense,
     will execute and deliver, in lieu thereof, a new Warrant, in the form
     hereof, in such denominations as Holder may request.

               d.  Cancellation; Payment of Expenses.  Upon the surrender of
                   ---------------------------------
     this Warrant in connection with any transfer, exchange, or replacement as
     provided in this Section 8, this Warrant shall be promptly canceled by the
     Company.  The Company shall pay all issuance taxes (other than securities
     transfer taxes) and charges payable in connection with the preparation,
     execution, and delivery of Warrants pursuant to this Section 8.

               e.  Warrant Register.  The Company shall maintain, at its
                   ----------------
     principal executive offices (or such other office or agency of the Company
     as it may designate by notice to the Holder), a register for this Warrant,
     in which the Company shall record the name and address of the person in
     whose name this Warrant has been issued, as well as the name and address of
     each transferee and each prior owner of this Warrant.

               f.  Additional Restriction on Exercise or Transfer.
                   ----------------------------------------------
     Notwithstanding anything to the contrary contained herein, the Warrant
<PAGE>

     shall not be exercisable by the Holder to the extent (but only to the
     extent) that, if exercisable by Holder, Holder would beneficially own in
     excess of 4.99% (the "Applicable Percentage") of the shares of Common
                           ---------------------
     Stock.  To the extent the above limitation applies, the determination of
     whether the Warrant shall be exercisable (vis-a-vis other securities owned
     by Holder which contain similar limitations on conversion) and of which
     Warrants shall be exercisable (as among Warrants) shall be made on the
     basis of the earliest submission of the Warrants (vis-a-vis other
     securities owned by the Holder which contain similar limitations on
     conversion and vis a vis other Warrants), in each case subject to such
     aggregate percentage limitation.  No prior inability to exercise Warrants
     pursuant to this paragraph shall have any effect on the applicability of
     the provisions of this paragraph with respect to any subsequent
     determination of exercisability.  For the purposes of this paragraph,
     beneficial ownership and all determinations and calculations, including
     without limitation, with respect to calculations of percentage ownership,
     shall be determined in accordance with Section 13(d) of the Securities
     Exchange Act of 1934, as amended, and Regulation 13D and G thereunder.  The
     provisions of this paragraph may be implemented in a manner otherwise than
     in strict conformity with the terms of this Section 8(f) with the approval
     of the Board of Directors of the Company and the Holder:  (i) with respect
     to any matter to cure any ambiguity herein, to correct this paragraph (or
     any portion hereof) which may be defective or inconsistent with the
     intended Applicable Percentage beneficial ownership limitation herein
     contained or to make changes or supplements necessary or desirable to
     properly give effect to such Applicable Percentage limitation; and (ii)
     with respect to any other matter, with the further consent of the holders
     of a majority of the then outstanding shares of Common Stock.  For
     clarification, it is expressly a term of this security that the limitations
     contained in this Section shall apply to each successor Holder.  The
     holders of Common Stock of the Company shall be third-party beneficiaries
     of this Section 8(f) and the Company may not waive this Section 8(f)
     without the consent of holders of a majority of its Common Stock.

     9.  Registration Rights.  The initial holder of this Warrant (and certain
         -------------------
assignees thereof) is entitled to the benefit of such registration rights in
respect of the Warrant Shares as are set forth in the Registration Rights
Agreement.

     10.  Notices.  Any notice herein required or permitted to be given shall
          -------
be in writing and may be personally served or delivered by courier or by
confirmed telecopy, and shall be deemed delivered at the time and date of
receipt (which shall include telephone line facsimile transmission). The
addresses for such communications shall be:
<PAGE>

               If to the Company:

               Online System Services, Inc.
               1800 Glenarm Place, Suite 700
               Denver, Colorado 80202
               Telecopy:  (303) 292-5039
               Attention:  William Cullen

               with a copy to:

               Gray, Plant, Mooty, Mooty & Bennett, P.A.
               3400 City Center
               33 South Sixth Street
               Minneapolis, MN 55402-3796
               Telecopy:  (612) 333-0066
               Attention:  Lindley S. Branson, Esq.

and if to the Holder, at such address as Holder shall have provided in writing
to the Company, or at such other address as each such party furnishes by notice
given in accordance with this Section 10.

          11.  Governing Law; Jurisdiction.  This Warrant shall be governed by
               ---------------------------
and construed in accordance with the laws of the State of New York applicable to
contracts made and to be performed in the State of New York.  The Company
irrevocably consents to the jurisdiction of the United States federal courts
located in the State of New York in any suit or proceeding based on or arising
under this Warrant and irrevocably agrees that all claims in respect of such
suit or proceeding may be determined in such courts.  The Company irrevocably
waives the defense of an inconvenient forum to the maintenance of such suit or
proceeding.  The Company agrees that a final nonappealable judgment in any such
suit or proceeding shall be conclusive and may be enforced in other
jurisdictions by suit on such judgment or in any other lawful manner.

          12.  Miscellaneous.
               -------------

               12.1 Amendments.  This Warrant and any provision hereof may only
                    ----------
     be amended by an instrument in writing signed by the Company and the
     Holder.

               12.2  Descriptive Headings.  The descriptive headings of the
                     --------------------
     several Sections of this Warrant are inserted for purposes of reference
     only, and shall not affect the meaning or construction of any of the
     provisions hereof.

               12.3  Cashless Exercise.  Notwithstanding anything to the
                     -----------------
     contrary contained in this Warrant, this Warrant may be exercised by
     presentation and surrender of this Warrant to the Company at its principal
<PAGE>

     executive offices with a written notice of the Holder's intention to effect
     a cashless exercise, including a calculation of the number of shares of
     Common Stock to be issued upon such exercise in accordance with the terms
     hereof (a "Cashless Exercise").  In the event of a Cashless Exercise, in
                -----------------
     lieu of paying the Exercise Price in cash, the Holder shall surrender this
     Warrant for the number of shares of Common Stock determined by multiplying
     the number of Warrant Shares to which it would otherwise be entitled by a
     fraction, the numerator of which shall be the difference between the then
     current Market Price per share of the Common Stock and the Exercise Price,
     and the denominator of which shall be such then current Market Price per
     share of Common Stock.  Notwithstanding the provisions of this section
     12(c), so long as a Registration Statement is effective and is available
     for immediate use pursuant to the Registration Rights Agreement dated even
     date herewith, the Holder shall not have the rights provided to it under
     this provision.

               12.4  Assignability.  This Warrant shall be binding upon the
                     -------------
     Company and its successors and assigns and shall inure to the benefit of
     Holder and its successors and assigns.  The Holder shall notify the Company
     upon the assignment of this Warrant.

                                     * * *
<PAGE>

      IN WITNESS WHEREOF, the Company has caused this Warrant to be signed by
its duly authorized officer.

                              Online System Services, Inc.


                              By:    /s/ William R. Cullen
                                     -----------------------
                              Name:  William R. Cullen
                                     -------------------
                              Title: EVP & CFO
                                     -----------
<PAGE>

                          FORM OF EXERCISE AGREEMENT

        (To be Executed by the Holder in order to Exercise the Warrant)

     The undersigned hereby irrevocably exercises the right to purchase
____________ of the shares of common stock of Online System Services, Inc., a
Colorado corporation doing business as Webb Interactive Services, Inc. (the
"Company"), evidenced by the attached Warrant, and [herewith makes payment of
 -------
the Exercise Price with respect to such shares in full/ elects to effect a
Cashless Exercise pursuant to the terms of the Warrant], all in accordance with
the conditions and provisions of said Warrant.

     (i)  The undersigned agrees not to offer, sell, transfer or otherwise
dispose of any Common Stock obtained on exercise of the Warrant, except under
circumstances that will not result in a violation of the Securities Act of 1933,
as amended, or any state securities laws.

     (ii) The undersigned requests that stock certificates for such shares be
issued, and a Warrant representing any unexercised portion hereof be issued,
pursuant to the Warrant in the name of the Holder (or such other person or
persons indicated below) and delivered to the undersigned (or designee(s) at the
address (or addresses) set forth below:

Date:_____________                     _________________________________________
                                       Signature of Holder


                                       Name of Holder (Print)

                                       Address:
<PAGE>

                              FORM OF ASSIGNMENT

     FOR VALUE RECEIVED, the undersigned hereby sells, assigns, and transfers
all rights of the undersigned under the within Warrant, with respect to the
number of shares of Common Stock covered thereby set forth hereinbelow, to:

Name of Assignee             Address                  No. of Shares
- ----------------             -------                  -------------


, and hereby irrevocably constitutes and appoints ______________________________
as agent and attorney-in-fact to transfer said Warrant on the books of the
within-named corporation, with full power of substitution in the premises.

Date:____________, _____,

In the presence of


                                  Name:_________________________________________

                                  Signature:____________________________________

                                       Title of Signing Officer or Agent (if
                                       any):

                                       Address:  _______________________________

                                       Note:  The above signature should
                                              correspond exactly with the name
                                              on the face of the within Warrant.
<PAGE>

EXHIBIT C
to Securities Purchase Agreement

                         REGISTRATION RIGHTS AGREEMENT

     THIS REGISTRATION RIGHTS AGREEMENT (this "Agreement"), is made as of
                                               ---------
August 25, 1999, by and among Online System Services, Inc., a Colorado
corporation doing business as Webb Interactive Services, Inc. (the "Company"),
                                                                    -------
with headquarters located at 1800 Glenarm Place, Suite 700, Denver, Colorado,
80202, and Castle Creek Technology Partners LLC (the "Initial Purchaser").
                                                      -----------------

                                   RECITALS
                                   --------

     A.   In connection with the Securities Purchase Agreement dated of even
date herewith by and between the Company and the Initial Purchaser (the
"Securities Purchase Agreement"), the Company has agreed, upon the terms and
 -----------------------------
subject to the conditions contained therein, to issue and sell to the Initial
Purchaser (i) an amount of the Company's three-year 10% Promissory Note (the
"Note") which is convertible into shares of the Company's Common Stock, no par
 ----
value (the "Common Stock"), (ii) a warrant in the form of Exhibit B (the
            ------------                                  ---------
"Warrant") entitling the holder thereof to purchase the number of shares (the
- --------
"Warrant Shares") of Common Stock as set forth below.  The Note and the PIK
- ---------------
Notes (as defined in the Note) are collectively referred to herein as the
"Convertible Securities".  The shares of Common Stock issuable upon conversion
- -----------------------
of or otherwise pursuant to the Convertible Securities are referred to herein as
the "Conversion Shares."  The Convertible Securities, the Warrant, the
     -----------------
Conversion Shares and the Warrant Shares are collectively referred to herein as
the "Securities".
     ----------

     B.   To induce the Initial Purchaser to execute and deliver the Securities
Purchase Agreement, the Company has agreed to provide certain registration
rights under the Securities Act of 1933, as amended, and the rules and
regulations thereunder, or any similar successor statute (collectively, the
"Securities Act"), and applicable state securities laws.
 --------------

                                  AGREEMENTS
                                   ----------

     NOW THEREFORE, in consideration of the premises and the mutual covenants
contained herein and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the Company, and the Initial
Purchaser hereby agree as follows:

                                   ARTICLE I
                                  DEFINITIONS
                                  -----------

     1.1  Definitions.  As used in this Agreement, the following terms
          -----------
shall have the following meanings:
<PAGE>

          (a)  "Purchasers" means the Initial Purchaser and any transferees or
                ----------
     assignees who agree to become bound by the provisions of this Agreement
     in accordance with Article IX hereof.

          (b)  "register," "registered," and "registration" refer to a
                --------    ----------        ------------
     registration effected by preparing and filing a Registration Statement or
     Statements in compliance with the Securities Act and pursuant to Rule 415
     under the Securities Act or any successor rule providing for offering
     securities on a continuous basis ("Rule 415"), and the declaration or
                                        --------
     ordering of effectiveness of such Registration Statement by the United
     States Securities and Exchange Commission (the "SEC").
                                                     ---

          (c)  "Registrable Securities" means the Conversion Shares (including
                ----------------------
     any Conversion Shares issuable with respect to payments under the Note)
     issued or issuable with respect to the Convertible Securities and the
     Warrant Shares issued or issuable with respect to the Warrant (without
     regard to any limitations on conversion or exercise) and any shares of
     capital stock or other securities issued or issuable, from time to time
     (with any adjustments), on or in exchange for or otherwise with respect to
     the Common Stock or any other Registrable Securities.

          (d)  "Registration Statement" means a registration statement of the
                ----------------------
     Company under the Securities Act pursuant to the provisions of this
     Agreement.

     1.2  Capitalized Terms.  Capitalized terms used herein and not otherwise
          -----------------
defined herein shall have the respective meanings set forth in the Securities
Purchase Agreement.

                                  ARTICLE II
                                 REGISTRATION
                                 ------------

     2.1  Mandatory Registration.  The Company shall prepare and file as soon as
          ----------------------
practicable but in any event on or prior to thirty (30) days after the date of
the Closing with the SEC a Registration Statement on Form S-3 (or, if Form S-3
is not then available, on such form of Registration Statement as is then
available to effect a registration of all of the Registrable Securities, subject
to the consent of the Initial Purchaser) covering the resale of all of the
Registrable Securities issuable upon full conversion of the Convertible
Securities and full exercise of the Warrant purchased and sold at the Closing,
including for purposes of this Section 2.1 any PIK Notes and without regard to
any limitation on any conversion or exercise, but limited to 1,129,568 shares of
Common Stock.  The Registration Statement (and each amendment or supplement
thereto, and each request for acceleration of effectiveness thereof) shall be
provided to (and subject to the approval of (which approval shall not be
unreasonably withheld or denied)) the Initial Purchaser and its counsel at least
seven (7) business days (or fewer to the extent provided herein) prior to its
filing or other submission.  The Company shall also prepare and file such
<PAGE>

amendments to registration statements and such additional registration
statements as may from time to time be required by this Agreement.

     2.2  Underwritten Offering.  If any offering pursuant to a Registration
          ---------------------
Statement pursuant to Section 2.1 hereof involves an underwritten offering, the
initial Purchaser shall have the right to select legal counsel to represent it
and an investment banker or bankers and manager or managers to administer the
offering, which investment banker or bankers or manager or managers shall be
reasonably satisfactory to the Company.

     2.3  Payments by the Company.  The Company shall use its best efforts to
          -----------------------
cause each Registration Statement required to be filed pursuant to Section 2.1
hereof to become effective as soon as practicable, but in no event later than
the ninetieth (90th) day (but 120th day if reviewed by SEC) following the
Closing Date (the "Registration Deadline"). If a Registration Statement covering
                   ---------------------
the Registrable Securities required to be filed by the Company pursuant to
Section 2.1 or Section 3.2 hereof is not declared effective by the SEC on or
before the applicable Registration Deadline (a "Registration Failure"), or if
                                                --------------------
after such Registration Statement has been declared effective by the SEC, sales
of all the Registrable Securities covered thereby cannot be made pursuant to
such Registration Statement (by reason of a stop order or the Company's failure
to update the registration statement or any other reason outside the control of
the Purchasers) (a "Registration Suspension"), then the Company will make
                    -----------------------
payments to the Purchasers in such amounts and at such times as shall be
determined pursuant to this Section 2.3 as partial relief for the damages to the
Purchasers by reason of any such delay in or reduction of their ability to sell
the Registrable Securities (which remedy shall not be exclusive of any other
remedies available at law or in equity).  In the event of a Registration
Failure, the Company shall pay to the Purchasers an amount equal to (A) the
Multiplier (as defined below) times (B) the Funded Amount (as defined below)
                              -----
times (C) the number of months (prorated per day for partial months) following
- -----
the applicable Registration Deadline prior to the date the applicable
Registration Statement filed pursuant to Section 2.1 or Section 3.2 is declared
effective by the SEC.  In addition, in the event of a Registration Suspension,
the Company shall pay to the Purchasers an amount equal to (D) the Multiplier
times (E) the Funded Amount times (F) the number of months (prorated per day for
- -----
partial months) from (x) the date on which sales of all the Registrable
Securities first cannot be made to (y) the date on which sales of all such
Registrable Securities can again be made.  With respect to any given
Registration Statement, the "Funded Amount" means the aggregate purchase price
                             -------------
of the Convertible Securities and the Warrant relating to the Common Stock
registered (or to be registered) on such Registration Statement.  Amounts to be
paid pursuant to this Section 2.3 shall be paid pro rata to Purchasers based
upon the number of Conversion Shares and Warrant Shares owned by them
(including, for these purposes, Conversion Shares issuable upon full conversion
of the Convertible Securities and Warrant Shares issuable upon full exercise of
the Warrant by each Purchaser, in each case without regard to any limitations
upon exercise and conversion contained therein) and shall be paid in cash.  Such
payments shall be made within five (5) days after the end of each period that
gives rise to
<PAGE>

such obligation, provided that, if any such period extends for more than thirty
(30) days, payments shall be made for each such thirty (30) day period within
five (5) days after the end of such thirty (30) day period. For purposes of this
Section 2.3, the "Multiplier" is equal to (a) for the first thirty (30) days in
                  ----------
the aggregate of any Registration Failures and Registration Suspensions, 0.01;
(b) for the second thirty (30) days in the aggregate of any Registration
Failures and Registration Suspensions, 0.015; (c) for the third thirty (30) days
in the aggregate and all successive thirty (30) day periods thereafter in the
aggregate of any Registration Failures and Registration Suspensions, 0.02.
Without limiting the foregoing, the Company shall cause the initial such
Registration Statement required to be filed pursuant to Section 2.1 hereof to
become effective within 180 days of the Closing Date and shall not permit such
Registration Statement (or any other Registration Statement hereunder) after it
becomes so effective to cease to be effective or available for use for five
consecutive trading days or ten trading days in any twelve month period.

     2.4  Piggy-Back Registrations.  If at any time prior to the expiration of
          ------------------------
the Registration Period (as hereinafter defined) the Company shall file with the
SEC a Registration Statement relating to an offering for its own account or the
account of others under the Securities Act of any of its equity securities
(other than on Form S-4 or Form S-8 or their then equivalents relating to equity
securities to be issued solely in connection with any acquisition of any entity
or business or equity securities issuable in connection with stock option or
other employee benefit plans), then the Company shall send to each Purchaser who
has a right to have Registrable Securities covered by a Registration Statement
pursuant to this Agreement written notice of such determination and, if within
fifteen (15) days after the date of such notice, such Purchaser shall so request
in writing, the Company shall include in such Registration Statement all or any
part of the Registrable Securities such Purchaser requests to be registered,
except that if, in connection with any underwritten public offering for the
account of the Company the managing underwriter(s) thereof shall impose a
limitation on the number of shares of Common Stock which may be included in the
Registration Statement because, in such underwriter(s)' judgment, marketing or
other factors dictate such limitation is necessary to facilitate public
distribution, then the Company shall be obligated to include in such
Registration Statement only such limited portion of the Registrable Securities
with respect to which such Purchaser has requested inclusion hereunder as the
underwriter shall permit. Any exclusion of Registrable Securities shall be made
pro rata among the Purchasers seeking to include Registrable Securities, in
proportion to the number of Registrable Securities sought to be included by such
Purchasers; provided, however, that the Company shall not exclude any
Registrable Securities unless the Company has first excluded all outstanding
securities, the holders of which are not entitled to inclusion of such
securities in such Registration Statement or are not entitled to pro rata
inclusion with the Registrable Securities; and provided, further, however, that,
after giving effect to the immediately preceding proviso, any exclusion of
Registrable Securities shall be made pro rata with holders of other securities
having the right to include such securities in the Registration Statement. No
right to registration of Registrable Securities under this Section 2.4 shall be
construed to limit any registration required under Section 2.1 or 3.2 hereof. If
an offering in connection with which a Purchaser is entitled to registration
<PAGE>

under this Section 2.4 is an underwritten offering, then each Purchaser whose
Registrable Securities are included in such Registration Statement shall, unless
otherwise agreed by the Company, offer and sell such Registrable Securities in
an underwritten offering using the same underwriter or underwriters and, subject
to the provisions of this Agreement, on the same terms and conditions as other
shares of Common Stock included in such underwritten offering.  So long as a
Registration Statement is effective and immediately available for use so that
all of the Registrable Securities may be sold in reliance thereon, the
provisions of this section shall not apply.

     2.5  Eligibility for Form S-3.  The Company represents and warrants that it
          ------------------------
is currently eligible to register the resale of the Conversion Shares, Warrant
Shares and all Registrable Securities by the Purchaser on a Registration
Statement on Form S-3 under the Securities Act for the account of Purchaser (and
not for or on behalf of Company). The Company shall file all reports required to
be filed by the Company with the SEC in a timely manner and take all other
actions which may be required so as to maintain such eligibility for the use of
Form S-3.

                                  ARTICLE III
                          OBLIGATIONS OF THE COMPANY
                          --------------------------

     In connection with the registration of the Registrable Securities, the
Company shall have the following obligations, including with respect to each
Registration Statement required to be filed hereunder:

     3.1  The Company shall prepare promptly and file with the SEC the
Registration Statement required by Section 2.1, and cause such Registration
Statement relating to Registrable Securities to become effective as soon as
practicable after such filing, and keep the Registration Statement effective
pursuant to Rule 415 and available for use at all times until such date as is
the earlier of (i) the date on which all of the Registrable Securities have been
sold (and no further Registrable Securities may be issued in the future) and
(ii) the date on which all of the Registrable Securities (in the reasonable
opinion of counsel to the Initial Purchaser) may be immediately sold to the
public without registration and without restriction as to the number of
Registrable Securities to be sold, whether pursuant to Rule 144 or otherwise
(the "Registration Period").  The Registration Statement (including any
      -------------------
amendments or supplements thereto and prospectuses contained therein and all
documents incorporated by reference therein) shall not contain any untrue
statement of a material fact or omit to state a material fact required to be
stated therein, or necessary to make the statements therein not misleading.

     3.2  The Company shall prepare and file with the SEC such amendments
(including post-effective amendments) and supplements to a Registration
Statement and the prospectus used in connection with the Registration Statement
as may be necessary to keep the Registration Statement effective and immediately
available for use at all times during the Registration Period, and, during such
period, comply with the provisions of the Securities Act with respect to the
disposition of all Registrable Securities of the Company
<PAGE>

covered by the Registration Statement until the termination of the Registration
Period or, if earlier, such time as all of such Registrable Securities have been
disposed of in accordance with the intended methods of disposition by the seller
or sellers thereof as set forth in the Registration Statement. In the event the
number of shares available under a Registration Statement filed pursuant to this
Agreement is, at any time, insufficient to cover one hundred fifty percent
(150%) of the Registrable Securities issued or issuable upon conversion of the
Convertible Securities or upon exercise of the Warrant (in each case, without
giving effect to any limitation on conversion or exercise thereof) held by any
Purchaser and required to be covered by such Registration Statement pursuant to
Section 2.1 or Section 3.2 hereof, the Company shall amend, if permissible, the
Registration Statement, or file a new Registration Statement (on the short form
available therefor, if applicable), or both, so as to cover two hundred percent
(200%) of the Registrable Securities issued or issuable to such Purchaser upon
such exercise or conversion (in each case, without giving effect to any
limitation on conversion or exercise thereof), in each case, as soon as
practicable, but in any event within five (5) business days. The Company shall
cause such amendment and/or new Registration Statement to become effective as
soon as practicable following the filing thereof, but in any event within five
(5) business days with respect to amendment and ten (10) business days with
respect to a new Registration Statement (each such deadline also being a
"Registration Deadline").

     Notwithstanding the foregoing, in the event the SEC reviews an amendment or
a new Registration Statement filed pursuant to this Agreement and so long as (i)
the Company in good faith uses its best efforts to address and resolve each and
all of the SEC comments made pursuant to such review and (ii) the Purchaser may
sell up to and including 100% of the Registrable Securities under an effective
Registration Statement which is immediately available for use so that all of the
Registrable Securities may be sold in reliance thereon, then the Company shall
not be subject to the payment provisions of Section 2.3 until such date of not
more than thirty (30) days from the date when such Registration Deadline or
Registration Failure first occurred.

     3.3  The Company shall furnish to each Purchaser whose Registrable
Securities are included in the Registration Statement and its legal counsel (a)
promptly after the same is prepared and publicly distributed, filed with the
SEC, or received by the Company, one copy of the Registration Statement and any
amendment thereto, each preliminary prospectus and prospectus and each amendment
or supplement thereto, and, in the case of the Registration Statement referred
to in Section 2.1, each letter written by or on behalf of the Company to the SEC
or the staff of the SEC, and each item of correspondence from the SEC or the
staff of the SEC, in each case relating to such Registration Statement (other
than any portion, if any, thereof which contains information for which the
Company has sought confidential treatment), and (b) such number of copies of a
prospectus, including a preliminary prospectus, and all amendments and
supplements thereto and such other documents as such Purchaser may reasonably
request in order to facilitate the disposition of the Registrable Securities
owned (or to be owned) by such Purchaser.
<PAGE>

     3.4  The Company shall (a) register and qualify the Registrable Securities
covered by the Registration Statement under securities laws of such
jurisdictions in the United States as each Initial Purchaser who holds (or has
the right to hold) Registrable Securities being offered reasonably requests, (b)
prepare and file in those jurisdictions such amendments (including post-
effective amendments) and supplements to such registrations and qualifications
as may be necessary to maintain the effectiveness thereof and availability for
use during the Registration Period, (c) take such other actions as may be
necessary to maintain such registrations and qualifications in effect at all
times during the Registration Period, and (d) take all other actions reasonably
necessary or advisable to qualify the Registrable Securities for sale in such
jurisdictions; provided, however, that the Company shall not be required in
connection therewith or as a condition thereto to (i) qualify to do business in
any jurisdiction where it would not otherwise be required to qualify but for
this Section 3.4, (ii) subject itself to general taxation in any such
jurisdiction, (iii) file a general consent to service of process in any such
jurisdiction, (iv) make any change in its charter or by-laws, which in each case
the board of directors of the Company determines to be contrary to the best
interests of the Company and its stockholders. Notwithstanding the foregoing,
this Section 3.4 shall only be for the benefit of Initial Purchaser and any
transferee of Initial Purchaser of $500,000 of the face amount of Securities at
the time of such transfer.

     3.5  In the event the Purchaser in an offering pursuant to a Registration
Statement or any amendment or supplement thereto under Section 2.1 or Section
3.2 hereof and the Initial Purchaser elects underwriters for the offering, the
Company shall enter into and perform its obligations under an underwriting
agreement, in usual and customary form, including, without limitation, customary
indemnification and contribution obligations, with the underwriters of such
offering.

     3.6  As soon as practicable after becoming aware of such event, the Company
shall notify (by telephone and also by facsimile and reputable overnight
courier) each Purchaser of the happening of any event, of which the Company has
knowledge, as a result of which the prospectus included in the Registration
Statement, as then in effect, includes an untrue statement of a material fact or
omission to state a material fact required to be stated therein or necessary to
make the statements therein not misleading, and use its best efforts as soon as
possible (but in any event within five (5) days) to prepare a supplement or
amendment to the Registration Statement (and make all required filings with the
SEC) to correct such untrue statement or omission, and the Company shall
simultaneously (and thereafter as requested) deliver such number of copies of
such supplement or amendment (or other applicable document) to each Purchaser as
such Purchaser may request in writing.

     3.7  The Company shall use its best efforts to prevent the issuance of any
stop order or other suspension of effectiveness of a Registration Statement,
and, if such an order is issued, to obtain the withdrawal of such order at the
earliest practicable time and the Company shall immediately notify by facsimile
each Purchaser (at the facsimile number for such Purchaser set forth on the
signature page hereto) who holds Registrable
<PAGE>

Securities being sold (or, in the event of an underwritten offering, the
managing underwriters) of the issuance of such order and the resolution thereof.

     3.8  The Company shall permit a counsel designated by the Initial Purchaser
to review the Registration Statement and all amendments and supplements thereto
a reasonable period of time prior to their filing with the SEC, and not file any
document in a form to which such counsel reasonably objects.

     3.9  The Company shall make generally available to its security holders as
soon as practical, but not later than ninety (90) days after the close of the
period covered thereby, an earnings statement (in form complying with the
provisions of Rule 158 under the Securities Act) covering a twelve-month period
beginning not later than the first day of the Company's fiscal quarter next
following the effective date of the Registration Statement.

     3.10  At the request of any Purchaser, the Company shall use reasonable
efforts to furnish, on the date of effectiveness of the Registration Statement
and thereafter from time to time on such dates as a Purchaser may reasonably
request but not more frequently than once every three months (a) an opinion,
dated as of such applicable date, from counsel representing the Company
addressed to the Purchasers and in form, scope and substance as is customarily
given in an underwritten public offering and (b) a letter, dated as of such
applicable date, from the Company's independent certified public accountants
addressed to the Purchasers and in form, scope and substance as customarily
given to underwriters in an underwritten public offering. Such requests made by
Purchaser shall not result in the Company bearing expenses which in light of all
the facts and circumstances and existing law and interpretations would be
unreasonable.

     3.11  The Company shall make available for inspection by (i) any Purchaser,
(ii) any underwriter participating in any disposition pursuant to the
Registration Statement, (iii) attorneys and accountants retained by any
Purchaser, and (iv) attorneys retained by such underwriters (collectively, the
"Inspectors") all pertinent financial and other records, and pertinent corporate
 ----------
documents and properties of the Company (collectively, the "Records"), as shall
                                                            -------
be reasonably deemed necessary by each Inspector and cause the Company's
officers, directors and employees to supply all information which any Inspector
may reasonably request; provided, however, that each Inspector shall hold in
confidence and shall not make any disclosure (except to a Purchaser) of any
Record or other information which the Company determines in good faith to be
confidential, and of which determination the Inspectors are so notified in
writing, unless (a) the disclosure of such Records is necessary to avoid or
correct a misstatement or omission in any Registration Statement or is otherwise
required to be disclosed in such Registration Statement to permit Purchaser to
sell under such Registration Statement, (b) the release of such Records is
ordered pursuant to a subpoena or other order from a court or government body of
competent jurisdiction, or is otherwise required by applicable law or legal
process or (c) the information in such Records has been made generally available
to the public other than by disclosure in violation of this or any other
agreement (to the
<PAGE>

knowledge of the relevant Purchaser). The Company shall not be required to
disclose any confidential information in such Records to any Inspector until and
unless such Inspector shall have entered into confidentiality agreements (in
form and reasonable substance satisfactory to the Company) with the Company with
respect thereto, substantially in the form of this Section 3.11. Each Purchaser
agrees that it shall, upon learning that disclosure of such Records is sought in
or by a court or governmental body of competent jurisdiction or through other
means, give prompt notice to the Company and allow the Company, at its expense,
to undertake appropriate action to prevent disclosure of, or to obtain a
protective order for, the Records deemed confidential. Nothing herein shall be
deemed to limit a Purchaser's ability to sell Registrable Securities in a manner
which is consistent with applicable laws and regulations.

     3.12  The Company shall hold in confidence and not make any disclosure of
information concerning a Purchaser provided to the Company unless (a) disclosure
of such information is necessary to comply with federal or state securities
laws, (b) the disclosure of such information is necessary to avoid or correct a
misstatement or omission in any Registration Statement, (c) the release of such
information is ordered pursuant to a subpoena or other order from a court or
governmental body of competent jurisdiction or is otherwise required by
applicable law or legal process, (d) such information has been made generally
available to the public other than by disclosure in violation of this or any
other agreement (to the knowledge of the Company), or (e) such Purchaser
consents to the form and content of any such disclosure. The Company agrees that
it shall, upon learning that disclosure of such information concerning a
Purchaser is sought in or by a court or governmental body of competent
jurisdiction or through other means, give prompt notice to such Purchaser prior
to making such disclosure, and allow the Purchaser, at its expense, to undertake
appropriate action to prevent disclosure of, or to obtain a protective order
for, such information.

     3.13  From and after Closing, the Company shall cause the listing and the
continuation of listing of all the Registrable Securities on Nasdaq Smallcap
Market and the Company shall use its best efforts to list its Common Stock on
the Nasdaq National Market System or the New York Stock Exchange and cause the
Registrable Securities to be quoted or listed on each additional national
securities exchange or quotation system upon which the Common Stock is then
listed or quoted.

     3.14  The Company shall provide a transfer agent and registrar, which may
be a single entity, for the Registrable Securities not later than the effective
date of the Registration Statement.

     3.15  The Company shall cooperate with the Purchasers who hold Registrable
Securities being offered and the managing underwriter or underwriters, if any,
to facilitate the timely preparation and delivery of certificates (not bearing
any restrictive legends) representing Registrable Securities to be offered
pursuant to the Registration Statement and enable such certificates to be in
such denominations or amounts, as the case may be, as the managing underwriter
or underwriters, if any, or the Purchasers may reasonably
<PAGE>

request and registered in such names as the managing underwriter or
underwriters, if any, or the Purchasers may request, and, within one (1)
business day after a Registration Statement which includes Registrable
Securities is ordered effective by the SEC, the Company shall cause legal
counsel selected by the Company to deliver, to the transfer agent for the
Registrable Securities (with copies to the Purchasers whose Registrable
Securities are included in such Registration Statement) an opinion of such
counsel in the form attached hereto as Exhibit 1.
                                       ---------

     3.16  At the request of any Purchaser, the Company shall promptly prepare
and file with the SEC such amendments (including post-effective amendments) and
supplements to a Registration Statement and the prospectus used in connection
with the Registration Statement as may be necessary in order to change the plan
of distribution set forth in such Registration Statement.

     3.17  The Company shall comply with all applicable laws related to a
Registration Statement and offering and sale of securities covered by the
Registration Statement and all applicable rules and regulations of governmental
authorities in connection therewith (including, without limitation, the
Securities Act and the Securities Exchange Act of 1934, as amended, and the
rules and regulations promulgated by the Commission).

     3.18  The Company shall take all such other actions as any Purchaser or the
underwriters, if any, reasonably request in order to expedite or facilitate the
disposition of such Registrable Securities.

     3.19  From and after the date of this Agreement, the Company shall not, and
shall not agree to, allow the holders of any securities of the Company (other
than Purchasers with respect to Registrable Securities) to include any of their
securities in any Registration Statement or any amendment or supplement thereto
under Section 2.1 or 3.2 hereof without the consent of the Initial Purchaser.

     3.20  The Registration Statement shall state that it covers such
indeterminate number of additional shares as may be issuable upon conversion of
the Convertible Securities or exercise of the Warrant to prevent dilution
resulting from stock splits, stock dividends and other similar transactions.

                                  ARTICLE IV
                         OBLIGATIONS OF THE PURCHASERS
                         -----------------------------

     In connection with the registration of the Registrable Securities, each
Purchaser shall have the following obligations:

     4.1  Purchaser shall furnish to the Company such information regarding
itself, the Registrable Securities held by it and the intended method of
disposition of the Registrable Securities held by it as shall be required to
effect the registration of such Registrable Securities.  At least five (5)
business days prior to the first anticipated filing
<PAGE>

date of the Registration Statement, the Company shall notify each Purchaser of
the information the Company requires from each such Purchaser.

     4.2  Each Purchaser, by such Purchaser's acceptance of the Registrable
Securities, agrees to cooperate with the Company as reasonably requested by the
Company in connection with the preparation and filing of the Registration
Statements hereunder, unless such Purchaser has notified the Company in writing
of such Purchaser's election to exclude all of such Purchaser's Registrable
Securities from the Registration Statement.

     4.3  Each Purchaser whose Registrable Securities are included in a
Registration Statement understands that the Securities Act may require delivery
of a prospectus relating thereto in connection with any sale thereof pursuant to
such Registration Statement, and each such Purchaser shall use its reasonable
efforts to comply with the applicable prospectus delivery requirements of the
Securities Act in connection with any such sale.

     4.4  Intentionally Deleted.
          ---------------------

     4.5  Each Purchaser agrees that, upon receipt of written notice from the
Company of the happening of any event of the kind described in Section 3.6, such
Purchaser will immediately discontinue disposition of Registrable Securities
pursuant to the Registration Statement covering such Registrable Securities
until such Purchaser's receipt of the copies of the supplemented or amended
prospectus contemplated by Section 3.6 or advice that a supplement or amendment
is not required and, if so directed by the Company, such Purchaser shall deliver
to the Company (at the expense of the Company) or destroy (and deliver to the
Company a certificate of destruction) all copies in such Purchaser's possession
(other than a limited number of permanent file copies), of the prospectus
covering such Registrable Securities current at the time of receipt of such
notice. Purchaser's obligations under this paragraph shall in no way limit the
Company's obligations under this Agreement or Purchaser's rights or remedies
against the Company with respect to any breach or threatened breach by the
Company of any such obligations.

     4.6  Without limiting a Purchaser's rights under Section 2.1 or 3.2 hereof,
no Purchaser may participate in any underwritten distribution hereunder unless
such Purchaser (a) agrees to sell such Purchaser's Registrable Securities on the
basis provided in any underwriting agreements in usual and customary form
entered into by the Company pursuant to Section 3.5 hereof, (b) completes and
executes all questionnaires, powers of attorney, indemnities, underwriting
agreements and other documents reasonably required under the terms of such
underwriting arrangements, and (c) agrees to pay its pro rata share of all
underwriting discounts and commissions and any expenses in excess of those
payable by the Company pursuant to Article V. Without implication that the
contrary would otherwise be true, it is expressly understood and agreed that no
Purchaser shall be required to participate in any such underwritten
distribution.
<PAGE>

                                   ARTICLE V
                           EXPENSES OF REGISTRATION
                           ------------------------

     All expenses, other than underwriting discounts and commissions, incurred
in connection with registrations, filings or qualifications pursuant to Articles
II and III, including, without limitation, all registration, listing and
qualification fees, printers and accounting fees, the fees and disbursements of
counsel for the Company, and the reasonable fees and disbursements of the
Inspectors selected by the Initial Purchaser pursuant to Section 3.11, hereof
shall be borne by the Company; provided that the Company shall not be obligated
                               --------
to pay any fees or expenses of the Inspectors in an amount in excess of Five
Thousand Dollars ($5,000.00) for each Registration Statement.

                                  ARTICLE VI
                                INDEMNIFICATION
                                ---------------

     In the event any Registrable Securities are included in a Registration
Statement under this Agreement:

     6.1  To the extent permitted by law, the Company will indemnify, hold
harmless and defend (a) each Purchaser who holds such Registrable Securities,
(b) each underwriter of Registrable Securities and (c) the directors, officers,
partners, members, employees, agents and persons who control any Purchaser
within the meaning of Section 15 of the Securities Act or Section 20 of the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), if any, (each,
                                                  ------------
an "Indemnified Person"), against any losses, claims, damages, liabilities or
    ------------------
expenses (collectively, together with actions, proceedings or inquiries whether
or not in any court, before any administrative body or by any regulatory or
self-regulatory organization, whether commenced or threatened, in respect
thereof, "Claims") to which any of them may become subject insofar as such
          ------
Claims arise out of or are based upon: (i) any untrue statement or alleged
untrue statement of a material fact in a Registration Statement or the omission
or alleged omission to state therein a material fact required to be stated or
necessary to make the statements therein not misleading, (ii) any untrue
statement or alleged untrue statement of a material fact contained in any
preliminary prospectus if used prior to the effective date of such Registration
Statement, or contained in the final prospectus (as amended or supplemented, if
the Company files any amendment thereof or supplement thereto with the SEC) or
the omission or alleged omission to state therein any material fact necessary to
make the statements made therein, in light of the circumstances under which the
statements therein were made, not misleading, or (iii) any violation or alleged
violation by the Company of the Securities Act, the Exchange Act, any other law,
including, without limitation, any state securities law, or any rule or
regulation thereunder relating to the offer or sale of the Registrable
Securities (the matters in the foregoing clauses (i) through (iii) being,
collectively, "Violations").  The Company shall reimburse each such Indemnified
               ----------
Person, promptly as such expenses are incurred and are due and payable, for any
reasonable legal fees or other reasonable expenses incurred by them in
connection with investigating or defending any such Claim.  Notwithstanding
anything to the
<PAGE>

contrary contained herein, the indemnification agreement contained in this
Section 6.1: (x) shall not apply to an Indemnified Person with respect to a
Claim arising out of or based upon a Violation which occurs in reliance upon and
in conformity with information furnished in writing to the Company by such
Indemnified Person expressly for use in the Registration Statement or any such
amendment thereof or supplement thereto; (y) shall not apply to amounts paid in
settlement of any Claim if such settlement is effected without the prior written
consent of the Company, which consent shall not be unreasonably withheld; and
(z) with respect to any preliminary prospectus, shall not inure to the benefit
of any Indemnified Person if the untrue statement or omission of material fact
contained in the preliminary prospectus was corrected on a timely basis in the
prospectus, as then amended or supplemented, if such corrected prospectus was
timely made available by the Company pursuant to Section 3.3 hereof, and the
Indemnified Person was promptly advised in writing not to use the incorrect
prospectus prior to the use giving rise to a Violation and such Indemnified
Person, notwithstanding such advice, used it. Such indemnity shall remain in
full force and effect regardless of any investigation made by or on behalf of
the Indemnified Person and shall survive the transfer of the Registrable
Securities by a Purchaser pursuant to Article IX.

     6.2  In connection with any Registration Statement in which a Purchaser is
participating, each such Purchaser agrees to indemnify, hold harmless and
defend, to the same extent and in the same manner set forth in Section 6.1, the
Company, each of its directors, each of its officers who signs the Registration
Statement, its employees, agents and persons, if any, who control the Company
within the meaning of Section 15 of the Securities Act or Section 20 of the
Exchange Act, and any other stockholder selling securities pursuant to the
Registration Statement, together with its directors, officers and members, and
any person who controls such stockholder or underwriter within the meaning of
the Securities Act or the Exchange Act (such an "Indemnified Party"), against
                                                 -----------------
any Claim to which any of them may become subject, under the Securities Act, the
Exchange Act or otherwise, insofar as such Claim arises out of or is based upon
any Violation, in each case to the extent (and only to the extent) that such
Violation occurs in reliance upon and in conformity with written information
furnished to the Company by such Purchaser expressly for use in connection with
such Registration Statement; and such Purchaser will reimburse any legal or
other expenses (promptly as such expenses are incurred and are due and payable)
reasonably incurred by them in connection with investigating or defending any
such Claim; provided, however, that the indemnity agreement contained in this
Section 6.2 shall not apply to amounts paid in settlement of any Claim if such
settlement is effected without the prior written consent of such Purchaser,
which consent shall not be unreasonably withheld; provided, further, however,
that a Purchaser shall be liable under this Agreement (including this Section
6.2 and Article VII) for only that amount as does not exceed the net proceeds
actually received by such Purchaser as a result of the sale of Registrable
Securities pursuant to such Registration Statement. Such indemnity shall remain
in full force and effect regardless of any investigation made by or on behalf of
such Indemnified Party and shall survive the transfer of the Registrable
Securities by a Purchaser pursuant to Article IX. Notwithstanding anything to
the contrary contained herein, the indemnification
<PAGE>

agreement contained in this Section 6.2 with respect to any preliminary
prospectus shall not inure to the benefit of any Indemnified Party if the untrue
statement or omission of material fact contained in the preliminary prospectus
was corrected on a timely basis in the prospectus, as then amended or
supplemented, and the Indemnified Party failed to utilize such corrected
prospectus.

     6.3  Promptly after receipt by an Indemnified Person or Indemnified Party
under this Article VI of notice of the commencement of any action (including any
governmental action), such Indemnified Person or Indemnified Party shall, if a
Claim in respect thereof is to be made against any indemnifying party under this
Article VI, deliver to the indemnifying party a written notice of the
commencement thereof, and the indemnifying party shall have the right to
participate in, and, to the extent the indemnifying party so desires, jointly
with any other indemnifying party similarly noticed, to assume control of the
defense thereof with counsel mutually satisfactory to the indemnifying party and
the Indemnified Person or the Indemnified Party, as the case may be; provided,
however, that such indemnifying party shall diligently pursue such defense and
that such indemnifying party shall not be entitled to assume such defense and an
Indemnified Person or Indemnified Party shall have the right to retain its own
counsel with the fees and expenses to be paid by the indemnifying party, if the
representation by such counsel of the Indemnified Person or Indemnified Party
and the indemnifying party would be inappropriate due to actual or potential
conflicts of interest between such Indemnified Person or Indemnified Party and
any other party represented by such counsel in such proceeding or the actual or
potential defendants in, or targets of, any such action include both the
Indemnified Person or the Indemnified Party and any such Indemnified Person or
Indemnified Party reasonably determines that there may be legal defenses
available to such Indemnified Person or Indemnified Party which are different
from or in addition to those available to such indemnifying party. The
indemnifying party shall pay for only one separate legal counsel for the
Indemnified Persons or the Indemnified Parties, as applicable, and such legal
counsel shall be selected by Purchasers holding a majority-in-interest of the
Registrable Securities included in the Registration Statement to which the Claim
relates (with the approval of the Initial Purchaser if it holds Registrable
Securities included in such Registration Statement), if the Purchasers are
entitled to indemnification hereunder, or by the Company, if the Company is
entitled to indemnification hereunder, as applicable. The failure to deliver
written notice to the indemnifying party within a reasonable time of the
commencement of any such action shall not relieve such indemnifying party of any
liability to the Indemnified Person or Indemnified Party under this Article VI,
except to the extent that the indemnifying party is actually prejudiced in its
ability to defend such action. The indemnification required by this Article VI
shall be made by periodic payments of the amount thereof during the course of
the investigation or defense, as such expense, loss, damage or liability is
incurred and is due and payable.
<PAGE>

                                  ARTICLE VII
                                 CONTRIBUTION
                                 ------------

     To the extent any indemnification by an indemnifying party is prohibited or
limited by law, the indemnifying party agrees to make the maximum contribution
with respect to any amounts for which it would otherwise be liable under Article
VI to the fullest extent permitted by law; provided, however, that (i) no person
guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of
the Securities Act) shall be entitled to contribution from any person of
Registrable Securities who was not guilty of such fraudulent misrepresentation,
and (ii) contribution (together with any indemnification or other obligations
under this Agreement) by any seller of Registrable Securities shall be limited
in amount to the net amount of proceeds received by such seller from the sale of
such Registrable Securities.

                                 ARTICLE VIII
                        REPORTS UNDER THE EXCHANGE ACT
                        ------------------------------

     With a view to making available to the Purchasers the benefits of Rule 144
promulgated under the Securities Act or any other similar rule or regulation of
the SEC that may at any time permit the Purchasers to sell securities of the
Company to the public without registration ("Rule 144"), the Company agrees to:
                                             --------

     8.1  File with the SEC in a timely manner and make and keep available all
reports and other documents required of the Company under the Securities Act and
the Exchange Act so long as the Company remains subject to such requirements (it
being understood that nothing herein shall limit the Company's obligations under
Section 4.3 of the Securities Purchase Agreement) and the filing and
availability of such reports and other documents is required for the applicable
provisions of Rule 144; and

     8.2  Furnish to each Purchaser so long as such Purchaser holds Convertible
Securities, the Warrant or Registrable Securities, promptly upon request, (i) a
written statement by the Company that it has complied with the reporting
requirements of Rule 144, the Securities Act and the Exchange Act, (ii) a copy
of the most recent annual or quarterly report of the Company and such other
reports and documents so filed by the Company, and (iii) such other information
as may be reasonably requested to permit the Purchasers to sell such securities
pursuant to Rule 144 without registration. This Section 8.2 shall not apply in
the event all of the Registrable Securities are registered on a Registration
Statement declared effective by the SEC and which is immediately available for
use for the sale or transfer of the Registrable Securities herein, or two years
has lapsed since the date of this agreement and the Securities may be sold or
transferred in reliance on Section (k) of Rule 144 of the Securities Act of
1933.
<PAGE>

                                  ARTICLE IX
                       ASSIGNMENT OF REGISTRATION RIGHTS
                       ---------------------------------

     The rights of the Purchasers hereunder, including the right to have the
Company register Registrable Securities pursuant to this Agreement, shall be
automatically assigned by each Purchaser to any transferee of all or any portion
of the Convertible Securities or the Registrable Securities if: (a) the
Purchaser agrees in writing with the transferee or assignee to assign such
rights, and a copy of such agreement is furnished to the Company within a
reasonable time after such assignment, (b) the Company is, within a reasonable
time after such transfer or assignment, furnished with written notice of (i) the
name and address of such transferee or assignee, and (ii) the securities with
respect to which such registration rights are being transferred or assigned, (c)
following such transfer or assignment, the further disposition of such
securities by the transferee or assignee is restricted under the Securities Act
or applicable state securities laws, and (d) at or before the time the Company
receives the written notice contemplated by clause (ii) of this sentence, the
transferee or assignee agrees in writing for the benefit of the Company to be
bound by all of the provisions contained herein. The rights of a Purchaser
hereunder with respect to any Registrable Securities not transferred (and not
represented by Convertible Securities or the Warrant transferred) shall not be
assigned by virtue of the transfer of other Registrable Securities or
transferred Convertible Securities or the Warrant representing other Registrable
Securities. Any such transferee who succeeds to rights hereunder shall be deemed
to have a separate agreement with the Company independent of this Agreement.

                                   ARTICLE X
                       AMENDMENT OF REGISTRATION RIGHTS
                       --------------------------------

     Provisions of this Agreement may be amended and the observance thereof may
be waived (either generally or in a particular instance and either retroactively
or prospectively), only with written consent of the Company and the Initial
Purchaser. In the event of the assignment of rights hereunder pursuant to
Article IX, the Company shall not take any action pursuant to such assignment
rights that would adversely affect Purchaser's rights hereunder without
Purchaser's consent. In addition, should the Company take any action or refrain
from any action with respect thereto, Purchaser shall be entitled to, at its
option, have the Company take such action or refrain from such action with
respect to Purchaser hereunder.

                                  ARTICLE XI
                                 MISCELLANEOUS
                                 -------------

     11.1  A person or entity is deemed to be a holder (or a holder in interest)
of Registrable Securities whenever such person or entity owns of record such
Registrable Securities (or the Convertible Securities or the Warrant which may
be converted into or exercised for Registrable Securities). If the Company
receives conflicting instructions, notices or elections from two or more persons
or entities with respect to the same
<PAGE>

Registrable Securities, the Company shall act upon the basis of instructions,
notice or election received from the registered owner of such Registrable
Securities (or Convertible Securities or the Warrant, as the case may be).

     11.2  Any notices herein required or permitted to be given shall be in
writing and may be personally served or delivered by courier or by machine-
generated confirmed telecopy, and shall be deemed delivered at the time and date
of receipt (which shall include telephone line facsimile transmission).  The
addresses for such communications shall be:

               If to the Company:

               Online System Services, Inc.
               1800 Glenarm Place, Suite 700
               Denver, Colorado 80202
               Telecopy: (303) 292-5039
               Attention: William Cullen

               with a copy to:

               Gray, Plant, Mooty, Mooty & Bennett, P.A.
               3400 City Center
               33 South Sixth Street
               Minneapolis, MN 55402-3796
               Telecopy:  (612) 333-0066
               Attention:  Lindley S. Branson, Esq.

if to any Purchaser, at such address as such Purchaser, shall have provided in
writing to the Company, or at such other address as each such party furnishes by
notice given in accordance with this Section 11.2.

     11.3  Failure of any party to exercise any right or remedy under this
Agreement or otherwise, or delay by a party in exercising such right or remedy,
shall not operate as a waiver thereof.

     11.4  This Agreement shall be governed by and construed in accordance with
the laws of the State of New York applicable to contracts made and to be
performed in the State of New York. The Company irrevocably consents to the
jurisdiction of the federal courts located in the State of New York in any suit
or proceeding based on or arising under this Agreement and irrevocably agrees
that all claims in respect of such suit or proceeding may be determined in such
courts. The Company irrevocably waives the defense of an inconvenient forum to
the maintenance of such suit or proceeding. The parties hereto further agree
that service of process upon the parties hereto mailed by first class mail shall
be deemed in every respect effective service of process upon each such party in
any such suit or proceeding. Nothing herein shall affect either party's right to
serve process in any other manner permitted by law. The parties hereto agree
that a final
<PAGE>

non-appealable judgment in any such suit or proceeding shall be conclusive and
may be enforced in other jurisdictions by suit on such judgment or in any other
lawful manner.

     11.5  This Agreement, the Convertible Securities, the Warrant and the
Securities Purchase Agreement (including all schedules and exhibits thereto and
all certificates and opinions required thereby) constitute the entire agreement
among the parties hereto with respect to the subject matter hereof and thereof.
There are no restrictions, promises, warranties or undertakings, other than
those set forth or referred to herein and therein.  This Agreement, the
Convertible Securities, the Warrant and the Securities Purchase Agreement
supersede all prior agreements and understandings among the parties hereto with
respect to the subject matter hereof and thereof.

     11.6  Subject to the requirements of Article IX hereof, this Agreement
shall inure to the benefit of and be binding upon the successors and assigns of
each of the parties hereto. Notwithstanding anything to the contrary contained
herein, including, without limitation, Article IX, the rights of a Purchaser
hereunder shall be assignable to and exercisable by a bona fide pledgee of the
Registrable Securities in connection with a Purchaser's margin or brokerage
accounts.

     11.7  The headings in this Agreement are for convenience of reference only
and shall not limit or otherwise affect the meaning hereof.

     11.8  This Agreement may be executed in two or more counterparts, each of
which shall be deemed an original but all of which shall constitute one and the
same agreement. This Agreement, once executed by a party, may be delivered to
the other party hereto, by facsimile transmission of a copy of this Agreement
bearing the signature of the party so delivering this Agreement.

     11.9  Each party shall do and perform, or cause to be done and performed,
all such further acts and things, and shall execute and deliver all such other
agreements, certificates, instruments and documents, as the other party may
reasonably request in order to carry out the intent and accomplish the purposes
of this Agreement and the consummation of the transactions contemplated hereby.

     11.10  [Intentionally omitted]

     11.11  In the event Purchaser shall sell or otherwise transfer any of
such holder's Registrable Securities, each transferee shall be allocated a pro
rata portion of the number of Registrable Securities included on a Registration
Statement for such transferor.  Any shares of Common Stock included on a
Registration Statement and which remain allocated to any person or entity which
does not hold any Registrable Securities shall be allocated to the remaining
participant, in such Registration Statement, pro rata based on the number of
shares of Registrable Securities then held by such participant.  Without
implication that the contrary would otherwise be true, for purposes of this
paragraph, all Convertible Securities and the Warrant then outstanding shall be
assumed converted into
<PAGE>

and exercised for Registrable Securities (without giving effect to any
limitations on conversion or exercise).

     11.12  If any provision of this Agreement shall be invalid or
unenforceable, such invalidity or unenforceability shall not affect the validity
or enforceability of the remainder of this Agreement.

                                     * * *
<PAGE>

     IN WITNESS WHEREOF, the parties have caused this Agreement to be duly
executed as of the date first above written.

ONLINE SYSTEM SERVICES, INC.


By:  /s/ William R.  Cullen
   -------------------------------
  Name:  William R.  Cullen
         -------------------------
  Title:  EVP & CFO
          ------------------------

Address:  1800 Glenarm Place, Suite 700
          Denver, Colorado 80202

Facsimile Number:  (303) 292-5039


Initial Purchaser:

CASTLE CREEK TECHNOLOGY PARTNERS LLC

     By:  CASTLE CREEK PARTNERS LLC
     Its: Managing Member


     By:  /s/ John Ziegelman
          ------------------------
     Name:  John Ziegelman
            ----------------------
     Title:  Managing Member
             ---------------------

Address:  c/o Castle Creek Partners LLC
          77 West Wacker Drive, Suite 4040
          Chicago, Illinois 60601
          Attention:  Portfolio Manager

Facsimile Number:  (312) 499-6999
<PAGE>

     EXHIBIT 1
     to Registration
     Rights Agreement

                                    [Date]

[Name and address
of transfer agent]

                    RE:  ONLINE SYSTEM SERVICES, INC.

Ladies and Gentlemen:

     We are counsel to Online System Services, Inc., a Colorado corporation (the
"Company"), and we understand that [Name of Purchaser] (the "Holder") has
- --------                                                     ------
purchased from the Company an amount of the Company's three-year 10% Promissory
Notes (the "Note") convertible into shares of the Company's common stock, no par
            ----
value (the "Common Stock").  The Note was purchased by the Holder pursuant to a
            ------------
Securities Purchase Agreement, dated as of August __, 1999, by and among the
Company and the signatories thereto (the "Agreement").  Pursuant to a
                                          ---------
Registration Rights Agreement, dated as of August __, 1999, by and among the
Company and the signatories thereto (the "Registration Rights Agreement"), the
                                          -----------------------------
Company agreed with the Holder, among other things, to register the Registrable
Securities (as that term is defined in the Registration Rights Agreement) under
the Securities Act of 1933, as amended (the "Securities Act"), upon the terms
                                             --------------
provided in the Registration Rights Agreement.  In connection with the Company's
obligations under the Registration Rights Agreement, on March __, 1999, the
Company filed a Registration Statement on Form S-_____ (File No. 333-
__________) (the "Registration Statement") with the Securities and Exchange
                  ----------------------
Commission (the "SEC") relating to the Registrable Securities, which names the
                 ---
Holder as a selling stockholder thereunder.

     [Other customary introductory and scope of examination language to be
     inserted]

Based on the foregoing, we are of the opinion that the Registrable Securities
have been registered under the Securities Act.

     [Other appropriate customary language reasonably acceptable to holder to be
     included.]

                                  Very truly yours,

cc:  [Name of Purchaser]

<PAGE>

                                                                    Exhibit 10.2

THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER
THE SECURITIES ACT OF 1933, AS AMENDED, OR THE SECURITIES LAWS OF ANY STATE OF
THE UNITED STATES.  THE SECURITIES REPRESENTED HEREBY MAY NOT BE OFFERED OR SOLD
OR OTHERWISE TRANSFERRED IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT
FOR THE SECURITIES UNDER APPLICABLE SECURITIES LAWS, OR UNLESS OFFERED, SOLD OR
TRANSFERRED PURSUANT TO AN AVAILABLE EXEMPTION FROM THE REGISTRATION
REQUIREMENTS OF THOSE LAWS.

                              10% PROMISSORY NOTE
                              -------------------

August 25, 1999                                                    $5,000,000.00

          FOR VALUE RECEIVED, Online System Services, Inc., a Colorado
corporation doing business as Webb Interactive Services, Inc. (hereinafter
called the "Company"), hereby promises to pay in cash to the order of Castle
            -------
Creek Technology Partners LLC ("Castle Creek") or its registered assigns or
                                ------------
transferees of all or any portion hereof (each a "Holder" and, collectively,
                                                  ------
"Holders") the aggregate sum of Five Million Dollars ($5,000,000.00) on August
- --------
25, 2002 (the "Scheduled Maturity Date"), and to pay interest, in arrears, on
               -----------------------
(i) the last day of March, June, September and December of each year (unless
such day is not a business day, in which event on the next succeeding business
day) (each, an "Interest Payment Date"), (ii) the Scheduled Maturity Date, and
                ---------------------
(iii) the date the principal amount of the Notes shall be declared to be or
shall automatically become due and payable, on the unpaid principal sum hereof
outstanding at the rates per annum set forth below, from the most recent
Interest Payment Date to which interest has been paid on this Note, or if no
interest has been paid on this Note, from the date of this Note (the "Issue
                                                                      -----
Date") until payment in full of the principal sum hereof has been made.
- ----
          The interest rate (the "Interest Rate") shall be ten percent (10%) per
                                  -------------
annum.  Past due amounts (including interest, to the extent permitted by law)
will also accrue interest at the lesser of (a) the Interest Rate plus 5% per
annum and (b) the maximum rate permitted by applicable law, and will be payable
on demand ("Default Interest").  Interest on this Note will be calculated on the
            ----------------
basis of a 365-day year.  All payments under this Note made in cash shall be
made by wire transfer of immediately available funds in currency of the United
States of America to such account as the Holders shall hereafter give to the
Company by written notice made in accordance with the provisions of this Note.

          At the option of the Company, interest may be paid in notes in the
form hereof ("PIK Notes") or in shares of the Company's Common Stock, no par
              ---------
value (the "Common Stock"), provided, however, that the Company may not pay
            ------------    --------  -------
interest in shares of Common Stock unless (a) no Event of Default (as defined
herein) (and no event which,
<PAGE>

with notice or passage of time, or the continuance thereof, would constitute an
Event of Default) has occurred and is continuing, (b) the shares of Common Stock
issuable (whether directly or pursuant to the PIK Notes) have been registered
for resale in an appropriate and an effective registration statement under the
Securities Act of 1933, as amended (the "Securities Act"), available for
- --------------
immediate use by the Holder and such shares are qualified or exempt under
applicable state securities laws so that the Holder may immediately thereafter
resell such shares of Common Stock, (c) the shares of Common Stock issuable
(whether directly or pursuant to the PIK Notes) are listed for trading on the
Nasdaq Smallcap Market ("Nasdaq") or the Nasdaq National Market System ("Nasdaq
                         ------                                          ------
NMS") or New York Stock Exchange ("NYSE") and (d) such shares of Common Stock
- ---                                ----
are, in the case of the PIK Notes, reserved for issuance in accordance with the
Reserved Amount (as defined below) requirement of Section 4.1 hereof. If the
Company determines to pay interest in shares of Common Stock, or PIK Notes, it
shall be required to notify the Holder of such irrevocable election at least
twenty (20) business days prior to the applicable Interest Payment Date. The
principal amount of Notes to be issued as interest shall be equal to the dollar
amount of interest due at the time of payment. The number of shares of Common
Stock issued as interest shall be the number determined by dividing the dollar
amount of interest due by an amount equal to the average of the Closing Bid
Prices (as defined herein) of the Common Stock for the ten (10) business days
prior to the date interest is so paid.

          This three-year 10% Promissory Note (the "Note") is referred to in the
                                                    ----
Securities Purchase Agreement dated August 25, 1999 by and between the Company
and Castle Creek (the "Securities Purchase Agreement").  The Securities Purchase
                       -----------------------------
Agreement contains certain additional agreements among the parties with respect
to the terms of this Note.  All such provisions are an integral part of this
Note and are incorporated herein by reference.  All terms defined in the
Securities Purchase Agreement and not otherwise defined herein shall have for
purposes hereof the meanings provided for therein.  This Note is transferable
and assignable to one or more purchasers (in minimum denominations of $100,000
or larger multiples of $1,000), in accordance with the limitations set forth in
the Securities Purchase Agreement.

                                   ARTICLE 1
                                  PREPAYMENT


     1.1   Intentionally Omitted
           ---------------------
     1.2   Prepayment at Company's Option.
           ------------------------------

           (a) The Company shall have the right ("Prepayment at Company's
                                                  -----------------------
     Election") to prepay, subject to the limitations herein contained, all or
     --------
     any portion of the then outstanding Notes (other than Notes which are the
     subject of a Notice of Conversion (as herein defined) delivered prior to
     the delivery date of prepayment) for the Optional Prepayment Amount (as
     herein defined) which right shall be exercisable at
<PAGE>

     any time during the term of this Note by delivery of an Optional Prepayment
     Notice in accordance with the prepayment procedures set forth in this
     Article I. Any Prepayment at Company's Election pursuant to this Section
     1.2 shall be made ratably among Holders in proportion to the principal
     amount of Notes then outstanding. Subject to the limitations on conversion
     herein contained, Holders may convert all or any part of their Notes
     selected for prepayment hereunder into Common Stock at the Conversion Price
     by delivering a Notice of Conversion to the Company at any time prior to
     the Effective Time of Prepayment (as defined herein). For each of the
     following time periods, the "Optional Prepayment Amount" with respect to
                                  --------------------------
     each Note means:


                               Optional Prepayment Amount (as a percentage of
                               ----------------------------------------------
                                the sum of the face amount of the Notes to be
                                ---------------------------------------------
          Time Period         prepaid, plus accrued and unpaid interest thereon)
          -----------         -------------------------------------------------
     Closing Date through                           107.5%
     180 days after Closing Date

     181 days after Closing Date through            125.0%
     364 days after Closing Date

     365 days after Closing Date through            120.0%
     729 days after Closing Date

     730 days after Closing Date through            115.0%
     1094 days after Closing Date

     Provided, however, that if, at any time after the first (1st) anniversary
     --------  -------
     of the Closing Date, the Closing Bid Prices of the Common Stock is greater
     than or equal to two hundred percent (200%) of the Conversion Price then in
     effect for each of the twenty (20) consecutive trading days immediately
     preceding the date of delivery of such Optional Prepayment Notice, then the
     Company may elect (the "200% Election") to effect a Prepayment at Company's
     Election at an Optional Prepayment Amount of 115%, subject to the
     -------------
     provisions of this Article I. Notwithstanding any of the foregoing, if at
     any time the Company elects to prepay its obligations herein while there
     exists an Event of Default (as defined under Section 7.3 herein), and such
     prepayment is permitted under Section 1.2(g) below, then the Optional
     Prepayment Amount shall be 125% (as a percentage of the face amount of the
     Notes to be prepaid, plus accrued and unpaid interest).

           The Company shall only be permitted to exercise its right to a
     Prepayment at Company's Election not more than once in any three (3) month
     period. In no event shall the Company be permitted to make a 200% Election
     pursuant to this Article I of a principal amount of Notes
<PAGE>

     which, if all such principal amount of Notes subject to prepayment (plus
     all interest accrued thereon) were immediately converted into Common Stock
     pursuant to the terms hereof (but without regard to the limitations on
     conversion contained in Section 3.7(b)), would, solely as a result of such
     conversion and without regard to Section 3.7(b) hereof, result in any
     Holder owning in excess of 9.9% of the Common Stock (the "9.9%
                                                               ---
     Limitation"). A Prepayment at Borrower's Election shall be for not less
     ----------
     than One Million Dollars ($1,000,000.00) aggregate principal amount of
     Notes or, in the case of a 200% Election, such maximum lesser amount as
     would not cause the 9.9% Limitation to be exceeded as to any holder of
     Notes. Furthermore, unless otherwise permitted by the rules of Nasdaq,
     Nasdaq NMS or NYSE, if applicable, or unless the rules thereof no longer
     are applicable to the Company, in no event shall the Borrower be permitted
     to make a 200% Election pursuant to this Article I of a principal amount of
     Notes which, if all such principal amount of Notes subject to prepayment
     (plus all interest accrued thereon) were immediately converted into Common
     Stock pursuant to the terms hereof (without regard to Section 3.7(a)
     hereof), would, solely as a result of such conversion and without regard to
     Section 3.7(a) hereof, result in any Holder owning in excess of such
     Holder's allocable portion of the Cap Amount.

          (b)   The Company may not deliver an Optional Prepayment Notice (as
     defined below) or effect a prepayment unless

                (i)   on or prior to the date of delivery of such Optional
          Prepayment Notice, the Company shall have deposited with an escrow
          agent reasonably satisfactory to such Holder, as a trust fund, cash
          sufficient in amount to pay all amounts to which Holders are entitled
          upon such prepayment pursuant to Subsection (a) of this Section 1.2,
          with irrevocable instructions and authority to such escrow agent to
          complete the prepayment thereof in accordance with this Section 1.2;

                (ii)  no Event of Default (and no event which, with notice or
          passage of time, or the continuation thereof, would constitute an
          Event of Default) has occurred and is continuing; and

                (iii) after such time as the Notes are convertible and:
          (1) the shares of Common Stock issuable (whether directly or pursuant
          to the PIK Notes) have been registered for resale in an appropriate
          and an effective registration statement under the Securities Act of
          1933, as amended (the "Registration Statement"), available for
                                 ----------------------
          immediate use
<PAGE>

          by the Holder and such shares are qualified or exempt under applicable
          state securities laws so that the Holder may immediately thereafter
          resell such shares of Common Stock; (2) the shares of Common Stock
          issuable (whether directly or pursuant to the PIK Notes) are listed
          for trading on Nasdaq, Nasdaq NMS or the NYSE; (3) such shares of
          Common Stock are, in the case of the PIK Notes, reserved for issuance
          in accordance with the Reserved Amount requirement of Section 4.1
          hereof; and (4) the Registration Statement is and has been effective
          and available for use as contemplated above for the twenty (20)
          trading days immediately preceding such Notice and the Effective Time
          of Prepayment.

               Any Optional Prepayment Notice delivered in accordance with this
     subsection (b) shall be accompanied by a statement executed by a duly
     authorized officer of its escrow agent, certifying the amount of funds
     which have been deposited with such transfer agent or escrow agent and that
     the transfer agent or escrow agent has been instructed and agrees to act as
     prepayment agent hereunder.

               (c)  The Company shall effect the Prepayment at Company's
     Election under this Section 1.2 by giving prior written notice (the
     "Optional Prepayment Notice"), which notice may only be delivered on a
      --------------------------
     business day, and, if the Notes are convertible in accordance with the
     terms hereof, at least twenty (20) business days (ten (10) business days in
     the event of a prepayment prior to 180 days after the Closing Date) prior
     to the date on which such prepayment is to become effective (the "Effective
                                                                       ---------
     Time of Prepayment") to Holders of Notes selected for prepayment at the
     ------------------
     address and facsimile number of such Holder appearing in the Company's
     register for the Notes. The Optional Prepayment Notice shall indicate the
     Notes selected for prepayment and the Optional Prepayment Amount. The
     Optional Prepayment Notice shall be deemed to have been delivered to a
     Holder: (i) if such fax is received by such holder on or prior to 3:00 p.m.
     Chicago time, on the time and date of transmission of Company's fax; and
     (ii) if such fax is received by Holder after 3:00 p.m. Chicago time, on the
     next business day following the date of transmission of Company's fax;
     provided that, for any notice required under this subsection 1.2(c) to be
     valid, a copy of such notice must be sent to the Holders on the same day by
     overnight courier.

               (d) The Optional Prepayment Amount shall be paid to each Holder
     whose Notes are being prepaid at the Effective Time of Prepayment;

     provided, however, that (i) the Company shall not be obligated to deliver
     --------  -------
     any portion of the Optional Prepayment Amount until
<PAGE>

     either the Notes being prepaid are delivered to the office of the Company
     or the transfer agent as provided in this subsection 1.2(d), or such Holder
     notifies the Company or the transfer agent that such Notes have been lost,
     stolen or destroyed and delivers documentation in accordance with Section
     10.10 hereof and (ii) the aggregate principal amount of Notes of any Holder
     that the Borrower shall be entitled to prepay in connection with any
     Optional Prepayment Notice shall be reduced by the aggregate principal
     amount of Notes which are converted (or with respect to which a Notice of
     Conversion (as defined in Section 3.1) is delivered to the Company) after
     delivery to such Holder of such Optional Prepayment Notice and prior to the
     Effective Time of Prepayment. Notwithstanding anything herein to the
     contrary, in the event that the Notes being prepaid are not delivered to
     the Company or the transfer agent prior to the second business day
     following the Effective Time of Prepayment, the prepayment of the Notes
     pursuant to this Section 1.2 shall still be deemed effective as of the
     Effective Time of Prepayment and the Optional Prepayment Amount shall be
     paid to each Holder whose Notes are being prepaid by 5:00 p.m., Chicago
     time, on the next business day following the date on which the Notes are
     actually delivered to the Company or the transfer agent.

               (e) If the Company fails to deliver the Optional Prepayment
     Amount to the Holder on or before the Optional Prepayment Date (an

     "Optional Prepayment Default"), the Company shall pay to Holder an amount
     ----------------------------
     equal to:

                 (.24) x (D/365) x (Optional Prepayment Amount)

     where "D" means the number of days from the Optional Prepayment Date
     through and including the date on which the Company delivers the Optional
     Prepayment Amount to the Holder.

               The payments to which Holder shall be entitled pursuant to this
     subparagraph (e) are referred to herein as "Prepayment Default Payments."
                                                 ---------------------------

               (f) In the event of any Optional Prepayment Default, the Holder
     shall have the right (without limiting damages hereunder, the right to
     Prepayment Default Payments or any other right or remedy), at any time
     prior to the Company's delivery of the Optional Prepayment Amount to the
     Holder, to continue to treat the portion of this Note which was subject to
     prepayment as outstanding for all purposes hereof, including conversion in
     accordance with the procedures set forth in Article III hereof at, however,
     the lowest Conversion Price in effect during the period beginning on, and
     including, the date of the Optional Prepayment Notice which triggered the
     Company's rights pursuant to Section 1.2(a) above
<PAGE>

     through and including the day shares of Common Stock are delivered to the
     Holder upon such a conversion. In addition, if the Company fails to pay an
     Optional Prepayment Amount when due and owing, the Company shall thereafter
     forfeit its rights under this Article I to effect Prepayment at Company's
     Election.

            (g)  Notwithstanding the provisions of this Article I, during the
     continuance of at least one of the Events of Default under Sections 7.3(a),
     (b) or (d) herein and until cured or any occurrence which would with the
     passage of time, the giving of notice and/or the continuance thereof result
     in such an Event of Default and until cured, the Company shall lose its
     right to Prepayment at Borrower's Election.  Notwithstanding the foregoing,
     this section (g) shall only apply when any portion of this Note may be
     converted as provided herein.

                                   ARTICLE 2
                              CERTAIN DEFINITIONS

2.1  The following terms shall have the following meanings:

               (a) "Bankruptcy Event" shall mean any one or more of the
                    ----------------
     following:  (i) the commencement of any voluntary proceeding by the Company
     seeking entry of an order for relief under Title 11 of the United States
     Code or seeking any similar or equivalent relief under any other applicable
     federal or state law concerning bankruptcy, insolvency, creditors' rights
     or any similar law; (ii) the making by the Company of a general assignment
     for the benefit of its creditors; (iii) the commencement of any involuntary
     proceeding respecting the Company seeking entry of an order for relief
     against the Company in a case under Title 11 of the United States Code or
     seeking any similar or equivalent relief under any other applicable federal
     or state law concerning bankruptcy, insolvency, creditors' rights or any
     similar law; (iv) entry of a decree or order respecting the Company by a
     court having competent jurisdiction, which decree or order (x) results in
     the appointment of a receiver, liquidator, assignee, examiner, custodian,
     trustee, sequestrator (or other similar official) for the Company or for
     any substantial part of its property or (y) orders the winding up,
     liquidation, dissolution, reorganization, arrangement, adjustment, or
     composition of the Company or any of its debts; (v) the appointment,
     whether or not voluntarily by the Company, of a receiver, liquidator,
     assignee, examiner, custodian, trustee, sequestrator (or other similar
     official) for the Company or for any substantial part of its property; (vi)
     the failure by the Company to pay, or its admission in writing of its
     inability to pay, its debts generally as they become due; (vii) the
     exercise by any creditor of any right in connection with an interest of
     such creditor in any substantial part of the Company's property, including,
<PAGE>

     without limitation, foreclosure upon all or any such part of the Company's
     property, replevin, or the exercise of any rights or remedies provided
     under the Uniform Commercial Code with regard thereto; (viii) the making
     of, or the sending of a notice of, a bulk transfer by the Company; (ix) the
     calling by the Company of a general meeting of its creditors or any portion
     of them; (x) the failure by the Company to file an answer or other pleading
     denying the material allegations of any proceeding described herein that is
     filed against it; and (xi) the consent by the Company to any of the
     actions, appointments, or proceedings described herein or the failure of
     the Company to contest in good faith any such actions, appointments, or
     proceedings.  For purposes of this paragraph, the "Company" shall also
     refer to any material subsidiary thereof.

               (b) "Closing Bid Price" means, for any security as of any date,
                    -----------------
     the closing bid price of such security on the principal securities exchange
     or trading market where such security is listed or traded as reported by
     Bloomberg Financial Markets or a comparable reporting service of national
     reputation selected by the Company and reasonably acceptable to Holders of
     a majority of the aggregate principal amount represented by the then
     outstanding Notes (with the consent of the Initial Holder so long as the
     Initial Holder continues to own Notes) ("Majority Holders") if Bloomberg
                                              ----------------
     Financial Markets is not then reporting closing bid prices of such security
     (collectively, "Bloomberg"), or if the foregoing does not apply, the last
                     ---------
     reported sale price of such security in the over-the-counter market on the
     electronic bulletin board of such security as reported by Bloomberg, or, if
     no sale price is reported for such security by Bloomberg, the average of
     the bid prices of any market makers for such security as reported in the
     "pink sheets" by the National Quotation Bureau, Inc. If the Closing Bid
     Price cannot be calculated for such security on such date on any of the
     foregoing bases, the Closing Bid Price of such security on such date shall
     be the fair market value as reasonably determined by an investment banking
     firm selected by the Company and reasonably acceptable to the Majority
     Holders, with the costs of such appraisal to be borne by the Company.

               (c) "Conversion Amount" means (i) the portion of the principal
                    -----------------
     amount of this Note elected by Holder to be converted (the "Selected
                                                                 --------
     Amount"), which amount may be all or any portion of the principal amount of
     ------
     this Note plus (ii) an amount equal to the product of (A) N divided by 365
     times (B) .10 times (C) the Selected Amount; provided, however, that for a
                   -----                          --------  -------
     Conversion Date (as defined herein) which occurs during the thirty-day
     period beginning on the one hundred twentieth (120th) day (the "Interim
                                                                     -------
     Period") following the Closing Date, the Selected Amount may not exceed
     ------
     fifty percent (50%) of the original principal amount of this Note as of the
     Closing Date; provided further that
                   ---------------
<PAGE>

     notwithstanding any provision of this subsection (c), if a Material Adverse
     Change (as defined herein) occurs after the date hereof and prior to the
     expiration of the Interim Period, the Selected Amount shall not be subject
     to such limitation.

               (d) "Conversion Date" means, for any Optional Conversion, the
                    ---------------
     date specified in the Notice of Conversion, or if no date is specified
     therein, the date the Notice of Conversion is faxed or otherwise delivered
     to the Company; provided, however, that the Conversion Date shall not be
                     --------  -------
     prior to the date of delivery of the Notice of Conversion and any Notice of
     Conversion delivered to the Company on a day which is not a business day
     shall be deemed delivered as of the next following business day.

               (e) "Conversion Price" means, with respect to any Conversion
                    ----------------
     Date, the lower of the Fixed Conversion Price and the Variable Conversion
     Price, each as in effect as of such date, subject to adjustment as provided
     herein.

               (f) "Fixed Conversion Price" means one hundred and ten percent
                    ----------------------
     (110%) of the average of the Closing Bid Prices for the ten (10)
     consecutive trading days immediately preceding the Issue Date.  The Fixed
     Conversion Price is subject to adjustment as provided herein.

               (g) "N" means the number of days from the most recent Interest
                    -
     Payment Date to which interest has been paid and if no interest has been
     paid, then the number of days from the Issue Date, in each case to and
     including the Conversion Date as specified in the notice of conversion in
     the form attached hereto (the "Notice of Conversion").
                                    --------------------

               (h) "Variable Conversion Price" means, as of any Conversion Date,
                    -------------------------
     the average of the five lowest Closing Bid Prices during the fifteen (15)
     consecutive trading days immediately preceding the Conversion Date (subject
     to equitable adjustment for any stock splits, stock dividends,
     reclassifications or similar events during such fifteen (15) trading-day
     period), subject to adjustment as provided herein.

                                    ARTICLE 3
                                   CONVERSION

          3.1  Conversion at the Option of the Holder.  Subject to the
               --------------------------------------
limitations on conversions contained in Section 3.7 hereof, the Holder may, at
any time on or after the one hundred twentieth (120th) day following the Closing
Date and from time to time thereafter, convert (an "Optional Conversion") a
                                                    -------------------
Conversion Amount into a number of fully paid and nonassessable shares of Common
Stock equal to the number determined by dividing such Conversion Amount by the
Conversion Price.
<PAGE>

          3.2  Mechanics of Conversion.  In order to effect an Optional
               -----------------------
Conversion, a Holder (a "Converting Holder") shall fax (or otherwise deliver) a
                         -----------------
copy of the fully executed Notice of Conversion substantially in the form of

Exhibit A (the "Notice of Conversion") to the Company.  Upon receipt by the
- ---------       --------------------
Company of a facsimile copy of a Notice of Conversion from a Converting Holder,
the Company shall immediately send, via facsimile, a confirmation to the
Converting Holder stating that the Notice of Conversion has been received, the
date upon which the Company expects to deliver the Common Stock upon conversion
and the name and telephone number of a contact person at the Company regarding
the conversion.  Promptly following the faxing (or other delivery) of the Notice
of Conversion, the Holder shall surrender or cause to be surrendered to the
Company, this Note, duly endorsed, along with a copy of the Notice of
Conversion.

          3.3  Delivery of Common Stock Upon Conversion.  Subject to Section 3.6
               ----------------------------------------
hereof, upon the delivery of a Notice of Conversion, the Company shall, as soon
as practicable but in any event no later than the later of (a) the day that is
three business days following the Conversion Date and (b) the day that is the
first business day following the date of surrender of this Note (or delivery of
documentation in accordance with Section 10.10 hereof) (the "Delivery Period"),
                                                             ---------------
issue and deliver to the Converting Holder (x) that number of shares of Common
Stock issuable upon conversion of the portion of this Note being converted and
(y) a new Note in the form hereof representing the balance of the principal
amount hereof not being converted, if any.  Delivery under this Section 3.3 may
be made personally or by reputable overnight courier.  The person or persons
entitled to receive shares of Common Stock issuable upon such conversion shall
be treated for all purposes as the record holder of such shares at the close of
business on the Conversion Date and such shares shall be issued and outstanding
as of such date.

          3.4  Taxes.  The Company shall pay any and all taxes (other than
               -----
transfer taxes) which may be imposed with respect to the issuance and delivery
of the shares of Common Stock upon the conversion of this Note.

          3.5  No Fractional Shares.  No fractional shares of Common Stock are
               --------------------
to be issued upon the conversion of this Note, but the Company shall instead
round up to the next whole number the number of shares of Common Stock to be
issued upon such conversion.

          3.6  Conversion Disputes.  In the case of any dispute with respect to
               -------------------
a conversion, the Company shall promptly issue such number of shares of Common
Stock as are not disputed in accordance with Sections 3.1 and 3.3 hereof.  If
such dispute only involves the calculation of the Conversion Price, the Company
shall submit the disputed calculations to an independent accounting firm of
national standing (acceptable to the Converting Holder) via facsimile within two
(2) business days of receipt of the Notice of Conversion.  The accountant shall
audit the calculations and notify the Company and the Converting Holder of the
results no later than two (2) business days from the date it receives the
disputed calculations.  The accountant's calculation shall be deemed
<PAGE>

conclusive, absent manifest error. As soon as possible thereafter, the Company
shall then issue the appropriate number of shares of Common Stock in accordance
with Sections 3.1 and 3.3 hereof.

          3.7  Limitations on Conversions.  The conversion of this Note shall be
               --------------------------
subject to the following limitations (each of which limitations shall be applied
independently):

               (a) Cap Amount.  Prior to Shareholder Approval, unless otherwise
                   ----------
     permitted by the rules of the Nasdaq or unless the rules thereof no longer
     are applicable to the Company, in no event shall the total number of shares
     of Common Stock issued upon conversion of the Notes and exercise of the
     Warrant (as defined in the Securities Purchase Agreement) exceed the
     maximum number of shares of Common Stock that the Company can without
     stockholder approval so issue pursuant to Nasdaq Rule 4460(i) (or any
     successor rule) (the "Cap Amount") upon the conversion of the Notes and the
                           ----------
     exercise of the Warrants, which, as of the date of initial issuance of the
     Notes and Warrants, shall be 1,518,870 shares (or any such higher number as
     the rules permit).  A Holder's allocable portion of the Cap Amount shall be
     applicable to both Notes and Warrants held by it and shall be applied to
     such Notes and Warrants on the basis of the time of conversion or exercise,
     as the case may be, thereof.  In the event the Company is prohibited from
     issuing shares of Common Stock as a result of the operation of this clause
     (a), the Interest Rate on any portion of the Note which cannot be converted
     because of the limitations of Nasdaq Rule 4460(i) shall be permanently
     adjusted to fourteen percent (14%) and thereafter all interest on all Notes
     shall be payable in cash quarterly in arrears notwithstanding any other
     provision of this Note.  In the event that pursuant to the rules of Nasdaq
     the Warrants are not integrated with the Notes for purposes of the Cap
     Amount, then the Cap Amount shall apply solely to the Notes.

               (b) No Five Percent Holders.  Notwithstanding anything to the
                   -----------------------
     contrary contained herein, the Notes shall not be convertible by a Holder
     to the extent (but only to the extent) that, if convertible by such Holder,
     such Holder would beneficially own in excess of 4.99% (the "Applicable
                                                                 ----------
     Percentage") of the shares of Common Stock.  To the extent the above
     ----------
     limitation applies, the determination of whether the Notes shall be
     exercisable (vis-a-vis other securities owned by Holder which contain
     similar limitations on conversion) and of which Notes shall be exercisable
     (as among Notes) shall be made on the basis of the earliest submission of
     the Notes (vis-a-vis other securities owned by the Holder which contain
     similar limitations on conversion and vis a vis other Notes), in each case
     subject to such aggregate percentage limitation.  No prior inability to
     convert Notes pursuant to this paragraph shall have any effect on the
     applicability of the provisions of this paragraph with respect to any
<PAGE>

     subsequent determination of convertibility.  For the purposes of this
     paragraph, beneficial ownership and all determinations and calculations,
     including without limitation, with respect to calculations of percentage
     ownership, shall be determined in accordance with Section 13(d) of the
     Securities Exchange Act of 1934, as amended, and Regulation 13D and G
     thereunder.  The provisions of this paragraph may be implemented in a
     manner otherwise than in strict conformity with the terms of this Section
     with the approval of the Board of Directors of the Company and the Holder:
     (i) with respect to any matter to cure any ambiguity herein, to correct
     this paragraph (or any portion hereof) which may be defective or
     inconsistent with the intended Applicable Percentage beneficial ownership
     limitation herein contained or to make changes or supplements necessary or
     desirable to properly give effect to such Applicable Percentage limitation;
     and (ii) with respect to any other matter, with the further consent of the
     holders of a majority of the then outstanding shares of Common Stock.  For
     clarification, it is expressly a term of this security that the limitations
     contained in this Section shall apply to each successor Holder.  The
     holders of Common Stock of the Company shall be third-party beneficiaries
     of this subsection and the Company shall not waive this section without the
     consent of the holders of a majority of the Common Stock.

               (c) Material Adverse Change.  Notwithstanding anything to the
                   -----------------------
     contrary contained herein, the Notes shall be fully convertible (subject to
     (a) and (b) above) from and after the occurrence of a Material Adverse
     Change.  For the purposes of this Note, a "Material Adverse Change" means
                                                -----------------------
     any change which has a material adverse effect on (i) the business,
     operations, properties, financial condition, operating results or prospects
     of the Company and its subsidiaries, taken as a whole on a consolidated
     basis, (ii) the transactions contemplated hereby, (iii) the ability of the
     Company to perform its obligations under this Note, the Securities Purchase
     Agreement, that certain Registration Rights Agreement dated as of August
     25, 1999 by and between the Company and Castle Creek (the "Registration
                                                                ------------
     Rights Agreement") or the Warrants (collectively, the "Investment
     ----------------                                       ----------
     Agreements") or (iv) Holder's interest in the Note.
     ----------

     3.8  Intentionally omitted.
          ---------------------

     3.9  Electronic Transmission. In lieu of delivering physical certificates
          -----------------------
representing the Common Stock issuable upon conversion, provided the Company's
transfer agent is participating in the Depository Trust Company

("DTC") Fast Automated Securities Transfer program (the "FAST Program"), upon
- -----                                                    ------------
request of a Holder, the Company shall use its reasonable best efforts to cause
its transfer agent to electronically transmit the Common Stock issuable upon
conversion to the Holder by crediting the account of Holder's prime broker with
DTC through its Deposit Withdrawal Agent
<PAGE>

Commission system. The Company shall use its reasonable best efforts to
participate in an electronic delivery system acceptable to Holder within twelve
(12) months from the date of this Agreement.

                                   ARTICLE 4
                     RESERVATION OF SHARES OF COMMON STOCK

          4.1  Reserved Amount.  At the Issue Date and thereafter, the Company
               ---------------
shall have authorized and reserved and keep available for issuance not less than
one million, one hundred twenty-nine thousand five hundred sixty-eight
(1,129,568) shares of Common Stock (subject to equitable adjustment for any
stock splits, stock dividends, reclassification or similar events) (the

"Reserved Amount") solely for the purpose of effecting the conversion of the
- ----------------
Notes and the exercise of the Warrants.  The Company shall at all times reserve
and keep available out of its authorized but unissued shares of Common Stock a
sufficient number of shares of Common Stock to provide for the full conversion
of all outstanding Notes and issuance of the shares of Common Stock in
connection therewith and the full exercise of the Warrants and issuance of the
shares of Common Stock in connection therewith (in each case without giving
effect to any limitation on conversion or exercise thereof).  The Reserved
Amount shall be allocated among the Holders as provided in Section 10.1 hereof.

          4.2  Increases to Reserved Amount.  Without limiting any other
               ----------------------------
provision of this Article IV, if a Holder's allocable portion of the Reserved
Amount for any three (3) consecutive trading days (the last of such three (3)
trading days being the "Authorization Trigger Date") shall be less than one
                        --------------------------
hundred fifty percent (150%) of the number of shares of Common Stock issuable
upon conversion of such Holder's Note and exercise of such Holder's Warrants on
such trading days (in each case without giving effect to any limitation on
conversion or exercise thereof), the Company shall immediately notify all
Holders of such occurrence and shall take action as soon as possible, but in any
event within sixty (60) days (ten (10) days if such action solely requires
action of the Board of Directors of the Company) after an Authorization Trigger
Date (including, if necessary, shareholder approval to authorize the issuance of
additional shares of Common Stock), to increase the Reserved Amount so that each
Holder's allocable portion thereof shall equal or exceed two hundred percent
(200%) of the number of shares of Common Stock then issuable upon conversion of
such Holder's Note and exercise of such Holder's Warrants (in each case without
giving effect to any limitation on conversion or exercise thereof).

                                   ARTICLE 5
                    COMPLIANCE WITH CAP AMOUNT RESTRICTIONS

          If at any time after the Issue Date the then unissued portion of any
Holder's Cap Amount is less than one hundred seventy-five percent (175%) of the
number of shares of Common Stock then issuable upon conversion of such Holder's
Notes and exercise of such Holder's Warrants (in each case without giving effect
to any limitation on
<PAGE>

conversion or exercise thereof), the Company shall immediately notify all
Holders of such occurrence.

                                   ARTICLE 6
                         FAILURE TO SATISFY CONVERSIONS

          6.1  Conversion Default Payments.  If, at any time, (x) a Holder
               ---------------------------
submits a Notice of Conversion and the Company fails for any reason (other than
because such issuance would exceed such Holder's allocated portion of the Cap
Amount) to deliver, on or prior to the expiration of the Delivery Period for
such conversion, such number of shares of Common Stock to which such Holder is
entitled upon such conversion, or (y) the Company provides notice in violation
of Section 6.4 herein (including by way of public announcement) to any Holder at
any time of its intention not to issue shares of Common Stock upon exercise by
any Holder of its conversion rights in accordance with the terms of the Notes
(other than because such issuance would exceed such Holder's allocated portion
of the Cap Amount) (each of (x) and (y) being a "Conversion Default"), then the
                                                 ------------------
Company shall pay to such Holder damages in an amount equal to the product of
(A) the Damages Amount times (B) D times (C) .01, where:

          "D" means the number of days beginning and including the date of the
           -
Conversion Default through and including the Cure Date with respect to such
Conversion Default;

          "Damages Amount" means the Conversion Amount with respect to which
           --------------
such Conversion Default occurred plus all accrued and unpaid interest thereon as
of the first day of the Conversion Default.

          "Cure Date" means (i) with respect to a Conversion Default described
           ---------
in clause (x) of its definition, the date the Company effects the conversion of
the portion of this Note submitted for conversion and (ii) with respect to a
Conversion Default described in clause (y) of its definition, the date the
Company undertakes in writing to issue Common Stock in satisfaction of all
conversions of Notes in accordance with their terms; provided the Company so
honors such conversions.

          The payments to which a Holder shall be entitled pursuant to this
Section 6.1 are referred to herein as "Conversion Default Payments."  All
                                       ---------------------------
Conversion Default Payments shall be paid in cash within five (5) business days
of a Holder's demand therefore (which demand may be made at any time and from
time to time).

          6.2  Intentionally Omitted
               ---------------------

          6.3  Adjustment to Conversion Price.  If a Holder has not received
               ------------------------------
certificates for all shares of Common Stock within two business days following
the expiration of the Delivery Period with respect to a conversion of any
portion of any of such Holder's Notes, then the Fixed Conversion Price shall,
with respect to such conversion and thereafter, be the lesser of (i) the Fixed
Conversion Price on the Conversion Date
<PAGE>

specified in the Notice of Conversion which resulted in the Conversion Default
and (ii) the lowest Conversion Price in effect during the period beginning on,
and including, such Conversion Date through and including the Cure Date. If
there shall occur a Conversion Default of the type described in clause (y) of
Section 6.1 hereof, then the Fixed Conversion Price with respect to any
conversion thereafter shall be the lower of the Fixed Conversion Price and the
lowest Conversion Price in effect at any time during the period beginning on,
and including, the date of the occurrence of such Conversion Default through and
including the Cure Date. The Fixed Conversion Price shall thereafter be subject
to further adjustment as provided in this Note (including by virtue of re-
application of this Section 6.3), but shall not be subject to upward adjustment.

          6.4  Certain Prohibited Announcements.  The Company shall not provide
               -----------------------------------
notice to any Holder, including by way of public announcement, at any time, of
its intention not to issue shares of Common Stock to any Holder upon conversion
in accordance with the terms of the Notes (other than because such issuance
would exceed such Holder's allocated portion of the Cap Amount);

                                   ARTICLE 7
                               EVENTS OF DEFAULT

          7.1  Holder's Option to Demand Prepayment.  Upon the occurrence of an
               ------------------------------------
Event of Default, each Holder shall have the right to elect at any time and from
time to time to have all or any portion of such Holder's then outstanding Notes
prepaid by the Company for an amount equal to the Holder Demand Prepayment
Amount (as herein defined).

               (a) The right of a Holder to elect prepayment shall be
     exercisable upon the occurrence of an Event of Default by such Holder in
     its sole discretion by delivery of a Demand Prepayment Notice (as herein
     defined) in accordance with the procedures set forth in this Article VII.
     Notwithstanding the exercise of such right, the Holder shall be entitled to
     exercise all other rights and remedies available under the provisions of
     this Note and at law or in equity.

               (b) A Holder shall effect each demand for prepayment under this
     Article VII by giving at least three (3) business days prior written notice
     (the "Demand Prepayment Notice") of the date on which such prepayment is to
           ------------------------
     become effective (the "Effective Date of Demand of Prepayment"), the Notes
                            --------------------------------------
     selected for prepayment and the Holder Demand Prepayment Amount to the
     Company at the address and facsimile number provided in Section 10.4, which
     Demand Prepayment Notice shall be deemed to have been delivered on the
     business day after the date of transmission of Holder's fax (with a copy
     sent by overnight courier to the Company) of such notice.
<PAGE>

               (c) The Holder Demand Prepayment Amount shall be paid to a Holder
     whose Notes are being prepaid within one (1) business day following the
     Effective Date of Demand of Prepayment.

               (d) Promptly following the date on which the Notes are prepaid,
     Holder shall either deliver such Notes to the office of the Company or the
     transfer agent, or notify the Company or the transfer agent that such Notes
     have been lost, stolen or destroyed and deliver the documentation required
     in accordance with Section 10.10 hereof.

     7.2  Holder Demand Prepayment Amount.  The "Holder Demand Prepayment
          -------------------------------   ------------------------
Amount" means the greater of:  (i) 1.5 (in the event of an Event of Default
- ------
under 7.3(a), (b) or (d)) and 1.25 (in the event of any other Event of Default)
times the aggregate amount of the principal amount of this Note for which demand
is being made (the "Stated Value"), plus all accrued and unpaid interest thereon
                    ------------
through the date of prepayment and (ii) the product of (1) the highest price at
which the Common Stock is traded from the date of the Event of Default through
the date of the Effective Date of Demand of Prepayment (or the most recent
highest closing bid price if the Common Stock is not traded between such dates)
divided by the lowest Conversion Price during such period, and (2) the sum of
the Stated Value plus all accrued and unpaid interest thereon through the date
of prepayment.

     7.3  Events of Default. An "Event of Default" means any one of the
          -----------------      ----------------
          following:

          (a) the Company breaches, and such breach continues uncured for
     three (3) business days after the Company has been notified thereof in
     writing by a Holder, any covenant or other material term or condition of
     this Note, the Warrants, the Securities Purchase Agreement or the
     Registration Rights Agreement, including, without limitation, any default
     in payment of principal, interest or other amounts due hereunder or under
     the Registration Rights Agreement, and further including, without
     limitation, any breach of Section 3.3 hereof, Section 4.1 hereof, Section
     4.2 hereof, Section 6.1 hereof, Section 6.4 hereof, Section 2.3 of the
     Registration Rights Agreement, Section 3.2 of the Registration Rights
     Agreement, Section 4.9 of the Securities Purchase Agreement, or Section 5.1
     or 5.2 of the Securities Purchase Agreement;

          (b) any representation or warranty of the Company made herein or
     in any agreement, statement or certificate given in writing pursuant hereto
     or in connection herewith (including, without limitation, this Note, the
     Warrants, the Securities Purchase Agreement and the Registration Rights
     Agreement), shall be false or misleading in any material respect when made;

          (c)  a Bankruptcy Event occurs;
<PAGE>

               (d) the Company's execution or performance of its obligations
     under this Note, the Warrants, the Securities Purchase Agreement or the
     Registration Rights Agreement (the "Documents") constitutes a breach or is
                                         ---------
     restricted under any existing agreement of the Company (or would cause a
     default or acceleration (or right of acceleration) under such existing
     agreement), or the Company enters into any new agreement under which
     performance of any material obligation under the Documents would be a
     breach or be restricted or cause a default or acceleration (or right of
     acceleration) under such new agreement;

               (e) the Company or any subsidiary breaches or defaults under any
     agreement involving indebtedness for borrowed money or purchase price, the
     breach of or default under which results in the acceleration or right of
     acceleration (or with the passage of time or the giving of notice would
     result in the acceleration or right of acceleration) of the maturity of
     such debt owed by the Company;

               (f) an event of default (as defined in a Capital Lease
     obligation), or any occurrence which would with the passage of time or the
     giving of notice or continuance thereof result in an event of default
     therein;

               (g)  Intentionally omitted.
                    ---------------------

               (h) a judgment which, together with other undischarged judgments
     against the Company, is in excess of Five Hundred Thousand Dollars
     ($500,000) is rendered against the Company and, within sixty (60) days
     after entry thereof, such judgment is not discharged or execution thereof
     is not stayed pending appeal, or within sixty (60) days after the
     expiration of such stay, such judgment is not discharged; or

               (i) If for any reason the current Chairman of the Board, Chief
     Executive Officer or President leaves the employment of the Company or is
     no longer serving in such capacity, as the case may be, or is no longer
     performing in substantially the same capacity and performing the same
     duties and function of such capacity as of the date of this Agreement.

     7.4  Failure to Pay Damages Amount.  The Company shall pay the Holder
          -----------------------------
Demand Prepayment Amount within three (3) business days of receipt of a written
request therefor by a Holder.  Without limiting any obligations of Company
hereunder or rights or remedies of the Holder, in the event the Company is not
able to pay all amounts due and payable with respect to all Notes subject to
Holder Demand Prepayment Notices, the Company shall pay the Holders such amounts
pro rata, based on the total amounts payable to such Holder relative to the
total amounts payable to all Holders.  During the continuance of an Event of
Default (the "Default Period"), the Conversion Price shall mean the lowest
              --------------
Conversion Price at any time during the Default Period (notwithstanding
<PAGE>

the actual Conversion Date) determined in accordance with the foregoing
provisions of the definition.

                                   ARTICLE 8
                      ADJUSTMENTS TO THE CONVERSION PRICE

          The Conversion Price shall be subject to adjustment from time to time
as follows:

          8.1  Stock Splits, Stock Dividends, Etc.  If at any time on or after
               -----------------------------------
the date of issuance of this Note, the number of outstanding shares of Common
Stock is increased by a stock split, stock dividend, combination,
reclassification or other similar event, the Fixed Conversion Price and the
Variable Conversion Price shall be proportionately reduced, or if the number of
outstanding shares of Common Stock is decreased by a reverse stock split,
combination or reclassification of shares, or other similar event, the Fixed
Conversion Price and the Variable Conversion Price shall be proportionately
increased.  In such event, the Company shall notify the Company's transfer agent
of such change on or before the effective date thereof.

          8.2  Certain Public Announcements.  In the event that (i) the Company
               ----------------------------
makes a public announcement that it intends to consolidate or merge with any
other entity (other than a merger in which the Company is the surviving or
continuing entity and its capital stock is unchanged and there is no
distribution thereof) or to sell or transfer all or substantially all of the
assets of the Company or (ii) any person, group or entity (including the
Company) publicly announces a tender offer in connection with which such person,
group or entity seeks to purchase 50% or more of the Common Stock (the date of
the announcement referred to in clause (i) or (ii) of this paragraph is
hereinafter referred to as the "Announcement Date"), then the Conversion Price
                                -----------------
shall, effective upon the Announcement Date and continuing through the
consummation of the proposed tender offer or transaction or the Abandonment Date
(as defined below), be equal to the lesser of (x) the Conversion Price
calculated as provided in Article II hereof and (y) the Conversion Price which
would have otherwise been applicable for Conversion occurring on the
Announcement Date.  From and after the Abandonment Date, as the case may be, the
Conversion Price shall be determined as set forth in Article II hereof.  The

"Abandonment Date" means with respect to any proposed transaction or tender
- -----------------
offer for which a public announcement as contemplated by this paragraph has been
made, the date which is seven (7) trading days after the date upon which the
Company (in the case of clause (i) above) or the person, group or entity (in the
case of clause (ii) above) publicly announces the termination or abandonment of
the proposed transaction or tender offer which causes this paragraph to become
operative.

          8.3  Major Transactions.  If the Company shall consolidate or merge
               ------------------
with any other corporation or entity (other than a consolidation merger in which
the Company is the surviving or continuing entity and its capital stock is
unchanged and unissued in such transaction (except for issuances which do not
exceed fifty percent (50%) of the Common Stock)) or there shall occur any share
exchange pursuant to which all of the outstanding
<PAGE>

shares of Common Stock are converted into other securities or property or any
other such reclassification or change of the outstanding shares of Common Stock
or the Company shall sell all or substantially all of its assets (each of the
foregoing being a "Major Transaction"), then the holder of this Note may, at its
                   -----------------
option, either (a) in the event that the Common Stock remains outstanding or
holders of Common Stock receive any common stock or substantially similar equity
interest, in each of the foregoing cases which is publicly traded, retain this
Note and this Note shall continue to be convertible into such Common Stock or
shall apply, as nearly as practicable, to such other common stock or equity
interest, as the case may be, or (b) regardless of whether (a) applies, receive
consideration, in exchange for this Note (without payment of any exercise price
hereunder), equal to the greater of, as determined in the sole discretion by
such holder: (i) the number of shares of stock or securities or property of the
Company, or of the entity resulting from such Major Transaction (the "Major
                                                                      -----
Transaction Consideration"), to which a Holder of the number of shares of Common
- -------------------------
Stock delivered upon conversion of such Note would have been entitled upon such
Major Transaction had the Holder of such Note exercised its right of conversion
(without regard to any limitations on conversion herein or elsewhere contained)
on the trading date immediately preceding the public announcement of the
transaction resulting in such Major Transaction and had such Common Stock been
issued and outstanding and had such Holder been the holder of record of such
Common Stock at the time of the consummation of such Major Transaction and (ii)
the applicable percentage (as provided under Article I of this Note as if a
prepayment thereunder had been effected based on when such Notice of Major
Transaction shall have been delivered) of the principal amount of such Note plus
accrued interest, in the aggregate, in cash or if an Event of Default has
occurred and is continuing at the time of such Notice of Major Transaction or
thereafter prior to the consummation of such Major Transaction, then 125% of the
principal amount of such Note plus interest, in the aggregate in cash and the
Company shall make lawful provision therefor as a part of such Major Transaction
and shall cause the issuer of any security in such transaction which constitutes
Registrable Securities under the Registration Rights Agreement to assume all of
the Company's obligations thereunder. No sooner than ten (10) days nor later
than five (5) days prior to the consummation of the Major Transaction, but not
prior to the public announcement of such Major Transaction, the Company shall
deliver written notice ("Notice of Major Transaction") to each Holder, which
                         ---------------------------
Notice of Major Transaction shall be deemed to have been delivered one (1)
business day after the Company's sending such notice by telecopy (provided that
the Company sends a confirming copy of such notice on the same day by overnight
courier) of such Notice of Major Transaction. Such Notice of Major Transaction
shall indicate the amount and type of the Major Transaction Consideration which
such Holder would receive under clause (i) of this Section 8.3. If the Major
Transaction Consideration does not consist entirely of United States currency,
such Holder may elect to receive United States currency in an amount equal to
the value of the Major Transaction Consideration in lieu of the Major
Transaction Consideration by delivering notice of such election to the Company
within five (5) days of the Holder's receipt of the Notice of Major Transaction.
<PAGE>

          8.4  Adjustment Due to Distribution.  If the Company shall declare or
               ------------------------------
make any distribution of its assets (or rights to acquire its assets) to holders
of any class of Common Stock as a partial liquidating dividend, by way of return
of capital or otherwise (including any dividend or distribution to the Company's
shareholders in cash or shares (or rights to acquire shares) of capital stock of
a subsidiary) (a "Distribution") at any time after the date hereof, then the
                  ------------
Holders will be entitled to receive, upon the terms applicable to such
Distribution, the amount of such assets (or rights) which each Holder could have
acquired if such Holder had held the number of shares of Common Stock acquirable
upon complete conversion of this Note (without regard to any limitations on
conversion or exercise herein or elsewhere contained) immediately before the
date on which a record is taken for determining shareholders entitled to such
Distribution, or if no such record is taken, the date as of which the record
holders of Common Stock are to be determined to be entitled to such
Distribution.

          8.5  Issuance of Other Securities.  If, at any time after the Closing
               ----------------------------
Date the Company shall issue any securities which are convertible into or
exchangeable for Common Stock ("Convertible Securities") either (i) at a
                                ----------------------
conversion or exchange rate based on a discount from the market price of the
Common Stock at the time of conversion or exercise or (ii) with a fixed
conversion or exercise price less than the Fixed Conversion Price, then, at the
Holder's option:  (x) in the case of clause (i), the Variable Conversion Price
and Fixed Conversion Price in respect of any conversion of the Notes after such
issuance shall be calculated utilizing the greatest discount applicable to any
such Convertible Securities; and (y) in the case of clause (ii), the Fixed
Conversion Price shall be reduced to such lesser conversion or exercise price
and the Variable Conversion Price shall be proportionately reduced.  If the
Company shall issue any Convertible Securities that are convertible into or
exchangeable for shares of Common Stock on a basis different from that of this
Note, the Holder of this Note may elect that the provisions to this Note be
revised to incorporate such different provisions with respect to conversion or
exchange, subject to the limitations of Section 3.7 hereof; provided, however,
                                                            --------
Purchaser may not select provisions on a non-integrated basis which would have
an inequitable result on the intent of this provision.

          8.6  Purchase Rights.  If the Company issues any Convertible
               ---------------
Securities or rights to purchase stock, warrants, securities or other property
(the "Purchase Rights") pro rata to the record holders of any class of Common
      ---------------
Stock, then the Holders will be entitled to acquire, upon the terms applicable
to such Purchase Rights, the aggregate Purchase Rights which each Holder could
have acquired if such Holder had held the number of shares of Common Stock
acquirable upon complete conversion of this Note (without regard to any
limitations on conversion or exercise herein or elsewhere contained) immediately
before the date on which a record is taken for the grant, issuance or sale of
such Purchase Rights, or, if no such record is taken, the date as of which the
record holders of Common Stock are to be determined for the grants, issue or
sale of such Purchase Rights.
<PAGE>

          8.7.  Special Adjustment.  If the Company takes any actions (including
                ------------------
under or by virtue of this Article VIII) which would have a dilutive effect on
the Holder (including by virtue of the issuance of securities at less than fair
market value) or which would materially and adversely affect the Holder with
respect to its investment in the Note, and if the provisions of this Article
VIII are not strictly applicable to such actions or, if applicable to such
actions, would not operate to equitably protect the Holder against such actions,
then the Company shall promptly upon notice from a Holder appoint its
independent certified public accountants to determine as promptly as practicable
an appropriate adjustment to the terms hereof, including without limitation
adjustments to the Fixed Conversion Price and the Variable Conversion Price, or
another appropriate action to so equitably protect such Holder and prevent any
such dilution and any such material adverse effect, as the case may be.
Following such determination, the Company shall forthwith make the adjustments
or take the other actions described therein.

          8.8  Notices of Adjustment.  Upon the occurrence of each adjustment or
               ---------------------
readjustment pursuant to this Article VIII, the Company, at its expense, shall
promptly compute such adjustment or readjustment and prepare and furnish to each
Holder a certificate setting forth such adjustment or readjustment and showing
in detail the facts upon which such adjustment or readjustment is based.  The
Company shall, upon the written request at any time of any Holder, furnish to
such Holder a like certificate setting forth (i) such adjustment or
readjustment, (ii) the Conversion Price at the time in effect and (iii) the
number of shares of Common Stock and the amount, if any, of other securities or
property which at the time would be received upon conversion of a Note.

          8.9  Delisting.  In the event that the Common Stock of the Company is
               ---------
suspended from trading or is no longer listed (and authorized) for trading on
Nasdaq, Nasdaq NMS or the NYSE, at the option of the Purchaser (i) the
Conversion Price shall be reduced by twenty (20) percent of that amount
calculated pursuant to Article II hereof or (ii) the Company shall be required
to pay to the Holders an amount (the "Delisting Amount") equal to the product of
                                      ----------------
(a) one and one-half (1.5) percent times (b) the outstanding principal amount of
this Note on the date such suspension or delisting goes into effect plus all
accrued and unpaid interest thereon.  Such Delisting Amount shall be due and
payable to the Holders for each monthly period that the Common Stock of the
Company remains suspended from trading or is no longer listed (and authorized)
as specified herein.  Purchaser may change its election herein from time to
time, so long as Purchaser notifies the Company sixty-one (61) calendar days in
advance of any such change.

          8.10  Key Officer and Director Transfers.  If any Key Officer (as
                ----------------------------------
defined below) or director (in each case, or any member of his/her family or any
trust or other entity for the benefit of any member of his/her family), during
the period beginning on the Closing Date and ending on the date that is six
months after the registration statement required pursuant to Section 2.1 of the
Registration Rights Agreement is declared effective, and while such person is a
Key Officer or director, directly or indirectly, offers, sells, transfers,
assigns, pledges, or otherwise disposes of any shares of Common Stock, or any
<PAGE>

securities directly or indirectly convertible into or exercisable or
exchangeable for, or warrants, options or rights to purchase or acquire shares
of Common Stock (all such securities, "Options") or enter into any agreement,
contract, arrangement or understanding with respect to any such offer, sale,
transfer, assignment, pledge or other disposition of any Common Stock or Options
or provides or files any public notice, including pursuant to Rule 144 of the
Securities Act, of a bona fide intent to dispose of a specified amount of Common
Stock or Options (an "Executive Transfer"), then the Conversion Price shall be
                      ------------------
reduced by thirty (30) percent of that amount calculated pursuant to Article II
hereof; provided, however that a Key Officer or director (and all such entities
        --------  -------
for the benefit of any members of his/her family, collectively) may sell in the
aggregate sell during the six (6) month period following effectiveness of such
Registration Statement up to ten percent (10%) of his or her total holdings as
of the Issue Date without triggering the adjustments of this Section 8.10.  For
purposes of this Section 8.10, Key Officer shall mean R. Steven Adams, Lindley
                               -----------
S. Branson, William R. Cullen, Perry Evans, Andre Durand, Gwenael Hagan and
Simon Greenman and any person who assumes or performs the duties of any other
Key Officer.

                                   ARTICLE 9
                          RANK; PROTECTION PROVISIONS

          9.1  Participation.  Each Holder shall, as a Holder of a Note, be
               -------------
entitled to dividends paid and distributions made to the holders of Common Stock
to the same extent as if such Holder had fully converted the Note held by such
Holder on the record date for such dividends or distributions into Common Stock
(without regard to any limitations on conversion herein or elsewhere contained)
at the Conversion Price applicable on such record date and such Common Stock had
been issued on the day before such record date.  Payments under the preceding
sentence shall be made concurrently with the dividend or distribution to the
holders of Common Stock.

          9.2  Protection Provisions.  The Company shall not, without first
               ---------------------
obtaining the approval of the Majority Holders and, to the extent their
interests may be adversely affected, each initial Holder of Notes:  () alter or
change the rights, preferences or privileges of the Notes; () alter or change
the rights, preferences or privileges of any capital stock of the Company so as
to affect adversely the Notes; () redeem, or declare or pay any cash dividend or
distribution on any capital stock (except pursuant to any requirements of
capital stock already issued and outstanding); () do any act or thing not
authorized or contemplated by this Note which would result in any taxation with
respect to the Notes under Section 305 of the Internal Revenue Code of 1986, as
amended, or any comparable provision of the Internal Revenue Code as hereafter
from time to time amended (or otherwise suffer to exist any taxation as a result
thereof); or () sell or otherwise transfer all or substantially all of the
assets of the Company.
<PAGE>

                                   ARTICLE 10
                                 MISCELLANEOUS

          10.1  Allocation of Cap Amount and Reserved Amount.  The initial Cap
                --------------------------------------------
Amount and Reserve Amount shall be allocated pro rata among the Holders based on
the number of Notes and Warrants held by each Holder.  Each increase to the Cap
Amount or Reserved Amount shall be allocated pro rata among the Holders based on
the number of Notes and Warrants held by each Holder at the time of increase in
the Cap Amount or the Reserved Amount, as the case may be.  In the event a
Holder shall sell or otherwise transfer any of such Holder's Notes or Warrants,
each transferee shall be allocated a pro rata portion of such transferor's Cap
Amount and Reserved Amount.  Any portion of the Cap Amount or Reserved Amount
which remains allocated to any person or entity which does not hold any Notes
shall be allocated to the remaining Holders, pro rata based on the number of
Notes and Warrants then held by such Holders.

          10.2  Payment of Cash; Defaults.  Whenever the Company is required to
                -------------------------
make any cash payment to a Holder under this Note (as a Conversion Default
Payment, Holder Demand Prepayment Amount or otherwise), such cash payment shall
be made to the Holder by the method (by certified or cashier's check or wire
transfer of immediately available funds) elected by such Holder.  If such
payment is not delivered when due (any such amount not paid when due being a

"Default Amount") such Holder shall thereafter be entitled to interest on the
- ---------------
unpaid amount at a per annum rate equal to the lower of twenty-four percent
(24%) or the highest interest rate permitted by applicable law until such amount
is paid in full to the Holder.  In addition, and notwithstanding anything to the
contrary contained in this Note, a Holder may elect in writing to convert all or
any portion of accrued Default Amounts, at any time and from time to time, into
Common Stock at the lowest Conversion Price in effect during the period
beginning on the date of the default with respect thereto through the cure date
for such default.  In the event that a Holder elects to convert all or any
portion of the Default Amounts into Common Stock, the Holder shall so notify the
Company on a Notice of Conversion of such portion of the Default Amounts which
such Holder elects to so convert and such conversion shall otherwise be effected
in accordance with the provisions of, and subject to limitations contained in,
Article III hereof.

          10.3  Failure or Indulgence Not Waiver.  No failure or delay on the
                --------------------------------
part of a Holder in the exercise of any power, right or privilege hereunder
shall operate as a waiver thereof, nor shall any single or partial exercise of
any such power, right or privilege preclude other or further exercise thereof or
of any other right, power or privilege.

          10.4  Notice.  Any notice herein required or permitted to be given
                ------
shall be in writing and may be personally served or delivered by courier or by
confirmed telecopy and shall be deemed to have been given at the time and date
of receipt (which shall include telephone line facsimile transmission).  The
addresses for such communications shall be:
<PAGE>

               If to the Company:

               Online System Services, Inc.
               1800 Glenarm Place, Suite 700
               Denver, Colorado 80202
               Telecopy:  (303) 292-5039
               Attention:  William Cullen

               with a copy to:

               Gray, Plant, Mooty, Mooty & Bennett, P.A.
               3400 City Center
               33 South Sixth Street
               Minneapolis, MN 55402-3796
               Telecopy:  (612) 333-0066
               Attention:  Lindley S. Branson, Esq.

               If to Holder:

               Castle Creek Technology Partners LLC
               c/o Castle Creek Partners LLC
               77 West Wacker Drive, Suite 4040
               Chicago, Illinois 60601
               Telecopy:  (312) 499-6999
               Attention:  Portfolio Manager

               and with a copy to:

               Altheimer & Gray
               10 South Wacker Drive, Suite 4000
               Chicago, Illinois 60606
               Telecopy:  (312) 715-4800
               Attention:  Peter H. Lieberman, Esq.

          If to any other Holder, to such address set forth under Holder's name
on the signature page hereto executed by Holder.

          10.5  Amendment Provision.  Except as provided in Section 3.7(b)
                -------------------
hereof, this Note and any provision hereof may only be amended by an instrument
in writing signed by the Company and the Holder.  Following the transfer of any
portion of this Note (including any subsequent transfer) to any third party,
Holder shall, at its option, be entitled to the benefit of any amendments to the
transferred portion of this Note.  The term "Note" and all references thereto,
                                             ----
as used throughout this instrument, shall mean this instrument as originally
executed, or if later amended or supplemented, then as so amended or
supplemented.
<PAGE>

          10.6  Assignability.  This Note shall be binding upon the Company and
                -------------
its successors and assigns and shall inure to the benefit of each Holder and its
successors and assigns.  The Holder shall notify the Company upon the assignment
of this Note.

          10.7  Cost of Collection.  If default or failure is made in any manner
                ------------------
with respect to this Note, the Company shall pay the Holder hereof costs of
collection, including reasonable attorneys' fees.

          10.8  Governing Law.  This Note shall be governed by and construed in
                -------------
accordance with the laws of the State New York applicable to contracts made and
to be performed in the State of New York.  The Company irrevocably consents to
the jurisdiction of the United States federal courts located in the State of New
York in any suit or proceeding based on or arising under this Agreement and
irrevocably agrees that all claims in respect of such suit or proceeding may be
determined in such courts.  The Company irrevocably waives the defense of an
inconvenient forum to the maintenance of such suit or proceeding.  The Company
further agrees that service of process upon the Company, mailed by first class
mail shall be deemed in every respect effective service of process upon the
Company in any such suit or proceeding.  Nothing herein shall affect each
Holder's right to serve process in any other manner permitted by law.  The
Company agrees that a final non-appealable judgment in any such suit or
proceeding shall be conclusive and may be enforced in other jurisdictions by
suit on such judgment or in any other lawful manner.

          10.9  Denominations.  At the request of a Holder, upon surrender of
                -------------
this Note, the Company shall promptly issue new Notes in the aggregate
outstanding principal amount hereof, in the form hereof, in such denominations
as such Holder shall request.

          10.10  Lost or Stolen Notes.  Upon receipt by the Company of (i)
                 --------------------
evidence of the loss, theft, destruction or mutilation of this Note and (ii) (y)
in the case of loss, theft or destruction, an indemnity reasonably satisfactory
to the Company, or (z) in the case of mutilation, upon surrender and
cancellation of this Note, the Company shall execute and deliver new Notes, in
the form hereof, in such denominations as a Holder may request.  However, the
Company shall not be obligated to reissue such lost or stolen Notes if such
Holder contemporaneously requests the Company to convert this Note.

          10.11  Statements of Available Shares.  Upon request, the Company
                 ------------------------------
shall deliver to a Holder a written report notifying such Holder of any
occurrence which prohibits the Company from issuing Common Stock upon any such
conversion.  The report shall also specify (i) the total principal amount of all
outstanding Notes as of the date of the request, (ii) the total number or shares
of Common Stock issued upon all conversions of Notes through the date of the
request, (iii) the total number of shares of Common Stock issued upon exercise
of all Warrants through the date of the request, (iv) the total number of shares
of Common Stock which are reserved for issuance upon conversion of Notes and
exercise of Warrants as of the date of the request and (v) the total number of
shares of Common Stock which may thereafter be issued by the Company upon
conversion of
<PAGE>

Notes and exercise of the Warrant before the Company would exceed the Cap Amount
and Reserved Amount. The Company shall, within five (5) days after delivery to
the Company of a written request by any Holder, provide all of the information
enumerated in clauses (i) - (v) of this Section 10.11 and, at the reasonable
request of a Holder, make public disclosure thereof.

          10.12  Status as Note Holder.  Upon submission of a Notice of
                 ---------------------
Conversion by Holder, the principal amount of this Note and the interest thereon
covered thereby shall be deemed converted into shares of Common Stock and the
Holder's rights as a Holder of such converted Note with respect thereto shall
cease and terminate, excepting only the right to receive certificates for such
shares of Common Stock and to any remedies provided herein or otherwise
available at law or in equity to Holder because of a failure by the Company to
comply with the terms of this Note.  Notwithstanding the foregoing, if Holder
has not received certificates for all shares of Common Stock prior to the tenth
(10th) business day after the expiration of the Delivery Period with respect to
a conversion for any reason, then (unless Holder otherwise elects to retain its
status as a Holder of Common Stock) the portion of the principal amount and
interest thereon subject to such conversion shall be deemed outstanding under
this Note, the Holder shall regain the rights of a holder of a Note with respect
to such unconverted Notes and the Company shall, as soon as practicable, return
such unconverted Notes to the Holder.  In all cases, the Holder shall retain all
of its rights and remedies (including, without limitation, (i) the right to
receive Conversion Default Payments pursuant to Section 6.1 hereof to the extent
required thereby for such Conversion Default and any subsequent Conversion
Default and (ii) the right with respect to conversions in accordance with
Section 10.2 hereof, to the extent applicable) for the Company's failure to
convert this Note.

          10.13  Ratable Payments.  All payments and prepayments made by the
                 ----------------
Company with respect to the Notes shall be made ratably among all Holders of
Notes in accordance with the principal amount of such Notes.

          10.14  Remedies, Characterizations, Other Obligations, Breaches and
                 ------------------------------------------------------------
Injunctive Relief.  The remedies provided in this Note shall be cumulative and
- -----------------
in addition to all other remedies available under this Note, at law or in equity
(including a decree of specific performance and/or other injunctive relief), no
remedy contained herein shall be deemed a waiver of compliance with the
provisions giving rise to such remedy and nothing herein shall limit a Holder's
right to actual damages for any failure by the Company to comply with the terms
of this Note (including, without limitation, damages incurred to effect "cover"
of shares of Common Stock anticipated to be received upon a conversion hereunder
but not received in accordance with the terms hereof).  The Company covenants to
each Holder that there shall be no characterization concerning this instrument
of any other Investment Agreement other than as expressly provided herein or
therein, as the case may be.  Amounts set forth or provided for herein or
therein with respect to payments, conversion and the like (and the computation
thereof) shall be the amounts to be received by the Holder hereof and shall not,
except as expressly provided
<PAGE>

herein, be subject to any other obligation of the Company (or the performance
thereof). The Company further covenants and agrees for the benefit of Holder
that the exercise of Holders rights and remedies hereunder and/or in any of the
Investment Agreements (or through a combination) shall not (and shall not be
deemed to) result in Holder acting (or agreeing to act) other than independently
and on its own behalf and there shall be no other characterization with respect
thereto. The Company acknowledges that a breach by it of its obligations
hereunder will cause irreparable harm to the holders of the Notes and that the
remedy at law for any such breach may be inadequate. The Company therefore
agrees that, in the event of any such breach or threatened breach, the Holders
shall be entitled, in addition to all other available remedies, to an injunction
restraining any breach, without the necessity of showing economic loss and
without any bond or other security being required.

          10.15  Specific Shall Not Limit General; Construction.  No specific
                 ----------------------------------------------
provision contained in this Note shall limit or modify any more general
provision contained herein.  As used herein, the word "including" shall be
deemed to mean "including, without limitation."  This Note shall be deemed to be
jointly drafted by the Company and all Holders and shall not be construed
against any person as the drafter hereof.

                                     * * *
<PAGE>

          IN WITNESS WHEREOF, Company has caused this Note to be signed in its
name by its duly authorized officer as of the date first written above.

                              ONLINE SYSTEM SERVICES, INC.


                              By:  /s/ William R. Cullen
                                 ---------------------------------
                                 Name:  William R. Cullen
                                        --------------------------
                                 Title:  EVP & CFO
                                         -------------------------
<PAGE>

                                   Exhibit A
                                   ---------

                              NOTICE OF CONVERSION

The undersigned hereby irrevocably elects to convert (the "Conversion")
                                                           ----------
$__________ principal amount of the Note plus all accrued and unpaid interest on
such principal amount (i.e., $_________) plus all accrued and unpaid Conversion
Default Payments relating thereto and as specified below (if any) (each as
defined in the Note dated August __, 1999 (the "Note")), into shares of common
                                                ----
stock ("Common Stock") of Online System Services, Inc., a Colorado corporation
        ------------
doing business as Webb Interactive Services, Inc. (the "Company") according to
                                                        -------
the conditions of the Note, as of the date written below.  If securities are to
be issued in the name of a person other than the undersigned, the undersigned
will pay all transfer taxes payable with respect thereto.  No fee will be
charged to the Holder for any conversion except as provided herein.

The undersigned represents and warrants that all offers and sales by the
undersigned of the securities issuable to the undersigned upon conversion of
this Note shall be made pursuant to registration of the Common Stock under the
Securities Act of 1933, as amended (the "Act"), or pursuant to an exemption from
                                         ---
registration under the Act.

In the event of partial exercise, please reissue an appropriate Note(s) for the
principal balance which shall not have been converted.

                         Date of Conversion:________________________________

                         Applicable Conversion Price:_______________________

                         Amount of Conversion Default
                         Payments to be Converted, if
                         any:_______________________________________________

                         Number of Shares of Common
                         Stock to be Issued:________________________________

                         Signature:_________________________________________

                         Name:______________________________________________

                         Address:___________________________________________

ACKNOWLEDGED AND AGREED:

ONLINE SYSTEM SERVICES, INC.

By:____________________________

Name:__________________________

Title:_________________________  Date:__________________

<PAGE>

                                                                    Exhibit 99.1
[Online System Services Letterhead]

                                                           FOR IMMEDIATE RELEASE

     Webb Interactive Services, Inc. Completes $5 Million Bridge Financing

DENVER, CO - Aug. 26, 1999 - Webb Interactive Services, Inc. (NASDAQ: WEBB)
today announced that it has completed a bridge financing in the amount of $5
million provided by Castle Creek Technology Partners, LLC, a Chicago based
technology focused investment firm.  Paine Webber Incorporated served as the
Company's placement agent and advisor on this transaction.

"Our new XML-based publishing platform and related applications are being very
well received in the local e-commerce marketplace.  This is the first step
toward our permanent financing plan and enables us to continue to aggressively
pursue our business development efforts.  We are very pleased to have Castle
Creek as a new investor and Paine Webber as our advisor," stated R Steven Adams,
Chairman and CEO.  Adams continued:

"The bridge financing, which is in the form of a three-year convertible note, is
anticipated to be retired or become part of an anticipated $20 million second
stage financing scheduled for later this year."

About Webb

Webb Interactive Services (http://www.webb.net) provides application
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technologies and services that create a next generation foundation for
commercial community-based interactions, as well as c-banking transactions.
Webb's flagship product, CommunityWare/XML, provides an interactive framework of
services that enable its customers to strengthen the relationship between online
buyers and sellers.  Using the latest XML technology, this application platform
is comprised of publishing.  community-building, communications and transaction
tools that are designed to improve the effectiveness of businesses in the local
e-commerce marketplace.  Webb clients include Switchboard, Inc., CU Cooperative
Systems, Inc. (a network of 650 credit unions), RE/MAX International, Inc.,
Bresnan Communications, and the TCI Education Project.

About Castle Creek

Castle Creek technology, LLC invests, via private placement, in quality small-
cap public companies with entrepreneurial management teams, leading-edge
technologies and tangible market demand.  Castle Creek's approach is
characterized by a combination of relationship building, creative structuring
and "venture" risk taking.

Information and statements in this report, other than historical information,
should be considered forward-looking and reflect management's current views of
future events and financial performance that involve a number of risks and
uncertainties.  Factors that
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could cause actual results to differ materially include, but are not limited to,
the following: general economic conditions and developments within the Internet
and Intranet industries; product development and technology changes; competition
and pricing pressures; length of the sales cycle; variability of sale order flow
and management growth.

For more information, contact:

Webb Interactive Services, Inc.              Castle Creek Technology, LLC
Bob Monzel                                   John D. Ziegelman
Director, Corporate Communications           Managing Partner
303-296-9200                                 3120499-6901
[email protected]@castle-creek.com
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