Document:

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                                                                   EXHIBIT 10.30

                            SUPPLIERMARKET.COM, INC.

                             1999 Stock Option Plan
                             ----------------------

This Plan (this "Plan") of SupplierMarket.com, Inc. (the "Company") provides
that options for up to 5,251,924 shares (the "Shares") of the Company's Common
Stock, $.001 par value per share (the "Stock"), may be granted to employees of
the Company and its subsidiaries, as defined below, and to others who are in a
position to make significant contributions to the success of the Company and its
subsidiaries. Options granted pursuant to this Plan may be either incentive
stock options ("Incentive Options") as defined in Section 422 of the Internal
Revenue Code of 1986, as amended (the "Code"), or options that are not Incentive
Options ("Nonqualified Options"), or both.

1.   PURPOSE. The purpose of this Plan is to attract and retain employees and
others who are in a position to contribute significantly to the success of the
Company and its subsidiaries, to reward such contributions, and to encourage
optionholders to advance the long term interests of the Company and its
subsidiaries through ownership of the Company's Stock.

2.   ADMINISTRATION.
     --------------

         (a) Board of Directors. The Plan shall be administered by the Board of
Directors of the Company (the "Board"). The Board, subject to the express
provisions of this Plan, shall determine those persons to be granted options,
the times when options shall be granted, the number of Shares subject to each
option, and the terms and conditions of each option, including whether each
option is an Incentive Option or a Nonqualified Option. The Board shall
establish the form of instruments granting options and any other instruments
under this Plan, and the rules and regulations for the administration of this
Plan, and may amend and rescind such instruments, rules and regulations. The
Board shall interpret this Plan and decide any questions and settle all
controversies and disputes that may arise in connection with this Plan, and such
determinations of the Board shall be conclusive and shall bind all parties.
Subject to Section 16, the Board may, both generally and in particular
instances, waive compliance by an optionholder with any obligation to be
performed under an option and waive any condition or provision of an option,
except that in the case of an Incentive Option the Board may not (other than in
accordance with Section 5) grant any such waiver if such waiver would cause the
Incentive Option to no longer qualify as an Incentive Option under Section 422
of the Code.

         (b) Committee. The Board may, in its discretion, delegate its powers
with respect to this Plan to a committee of the Board (the "Committee"), in
which event all references to the Board hereunder shall be deemed to refer to
the Committee. The Committee shall be appointed by the Board and shall be
composed solely of two or more directors. A majority of the members of the
Committee shall constitute a quorum, and all determinations of the Committee
shall be made by a majority of its members. Any determination of the Committee
under this Plan may be made without notice or meeting of the Committee by a
writing signed by all of the members of the Committee.

         (c) Public Company Committee. From and after the date of the first
registration of an equity security of the Company under Section 12 of the
Securities and Exchange Act of 1934, as amended (the "Exchange Act"), if the
Board shall elect to designate its powers with respect to this Plan to a
Committee pursuant to the provisions of Subsection (b) above, the Committee
shall be composed solely of two or more directors, each of whom shall be a
"Non-Employee Director," as such term is defined from time to time in Rule 16b-3
promulgated under the Exchange Act, and each of whom shall be an "outside
director" within the meaning of Section 162(m) of the Code.

3.   EFFECTIVE DATE AND TERM. This Plan shall become effective upon adoption by
the Board or approval by the stockholders by at least a majority vote at a duly
held meeting (or by written consent as provided by applicable law), whichever is
earlier, but shall not become effective unless stockholder approval is obtained
within 12 months before or after the adoption of this Plan by the Board. The
Board may grant options under this Plan prior to such approval, but any such
option shall become effective as of

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the date of grant only upon such approval and, accordingly, no such option may
be exercisable prior to such approval. This Plan shall terminate 10 years after
its effective date.

4.   SHARES SUBJECT TO THE PLAN. The Shares shall be reserved for issuance upon
the exercise of options granted under this Plan. Shares subject to an option
which expires or is terminated may again be subjected to an option under this
Plan. Shares delivered under this Plan may be authorized but unissued Stock or
treasury Stock. No fractional Shares shall be issued under this Plan.

5.   CHANGES IN CAPITAL STOCK. In the event of a stock dividend, stock split or
combination of shares, recapitalization or other change in the Company's capital
stock, the number and kind of shares of stock or securities of the Company
subject to options then outstanding or subsequently granted under this Plan, the
maximum number of shares or securities that may be delivered under this Plan,
the exercise price, and other relevant provisions shall be adjusted
appropriately in a manner determined by the Board to be equitable, whose
determination shall be binding. The Board may also adjust the number of Shares
subject to outstanding options, the exercise price of outstanding options and
the terms of outstanding options to take into consideration material changes in
accounting practices or principles, consolidations or mergers, acquisitions or
dispositions of stock or property or any other event if it is determined by the
Board that such adjustment is appropriate to avoid distortion in the operation
of this Plan, provided that no such adjustment shall be made in the case of an
Incentive Option if it would constitute a modification, extension or renewal of
the option within the meaning of Section 424(h) of the Code, unless the
optionholder consents.

6.   ELIGIBILITY. All employees of the Company and its subsidiaries, as well as
those other persons or entities who, in the opinion of the Board, are in a
position to contribute significantly to the success of the Company or its
subsidiaries, including, without limitation, nonemployee Directors, consultants,
advisers, independent contractors, and other service providers, shall be
eligible to receive options under this Plan. A "subsidiary" for purposes of this
Plan shall be a subsidiary corporation as define din Section 424(f) of the Code.
Incentive Options shall be granted only to "employees" as defined in the
applicable provisions of the Code and regulations thereunder. Receipt of options
under this Plan or of awards under any other employee benefit plan of the
Company or any of its subsidiaries shall not preclude an employee from receiving
options or additional options under this Plan. In granting options the Board may
include or exclude previous participants in this Plan as the Board may
determine.

7.   TERMS AND CONDITIONS OF OPTIONS.
     -------------------------------

         (a) Number of Options. The aggregate fair market value (determined as
of the time of grant) of the Shares with respect to which Incentive Options are
exercisable for the first time by an employee during any calendar year (under
this Plan and all other stock option plans of the Company or its subsidiaries or
any parent corporation) shall not exceed $100,000.

         (b) Exercise Price. The exercise price of each option shall be
determined by the Board but, in the case of an Incentive Option, shall not be
less than 100% (110% in the case of an Incentive Option granted to a 10%
stockholder) of the fair market value of the stock subject to the option on the
date of grant; nor shall the exercise price of any option be less, in the case
of an original issue of authorized stock, than par value. For this purpose, (I)
"fair market value" shall be determined by the Board in good faith on a basis
consistent with the provisions of Section 422 of the Code and the regulations
promulgated thereunder, and (ii) "10% stockholder" shall mean any employee who
at the time of grant owns directly, or is deemed to own by reason of the
attribution rules set forth in Section 424(d) of the Code, more than 10% of the
total combined voting powers of all classes of stock of the Company or of any of
its parent or subsidiary corporations.

         (c) Duration, Vesting and Conditions of Exercise. Each option shall be
exercisable during such period or periods as the Board may determine, but in no
case after the expiration of 10 years (five years in the case of an Incentive
Option granted to a "10% stockholder" as defined in (b) above) from the date of
grant. In the discretion of the Board, options may be exercisable (I) in full
upon grant or (ii) over or after a period of time conditioned on satisfaction of
certain Company, division, group, office, individual or other performance
criteria, including the continued performance of services to the Company or its
subsidiaries. In

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the case of an option not immediately exercisable in full, the Board may at any
time accelerate the time at which all or any part of the option may be
exercised.

8.   EXERCISE OF OPTIONS. Any exercise of an option shall be in writing pursuant
to a written instrument in the form prescribed by the Board, signed by the
proper person and delivered to the Company, accompanied by (a) such documents as
may be required by this Plan, by such written instrument, or by the Board, and
(b) payment as required by such written instrument for the number of Shares for
which the option is exercised. In addition, each exercise of an option shall be
subject to such additional conditions as may be required by the Board, including
without limitation those described in Section __ of this Plan. No exercise of an
option shall be effective, and the Company shall not be obligated to deliver any
Shares, until all requirements and conditions for exercise have been met to the
satisfaction of the Board.

9.   CONDITIONS TO EXERCISE OF OPTIONS. Except as waived by the Board in a
particular case, all the following conditions shall be complied with as a
condition to the exercise of each option granted under this Plan:

         (a) Legal Matters. In the opinion of the Company's counsel all
applicable federal and state laws and regulations, including securities laws and
regulations, shall have been complied with, and legal matters in connection with
the issuance and delivery of such Shares shall have been approved by the
Company's counsel.

         (b) Listing and Registration of Shares. If at any time the Board shall
determine that the listing, registration or qualification by the Shares covered
by any option upon any securities exchange or under any state or federal law, or
the consent or approval of any governmental regulatory body, is necessary or
desirable as a condition of or in connection with the granting of such option or
the issuance or purchase of Shares thereunder, such option may not be exercised
in whole or in part unless and until such listing, registration, qualification,
consent or approval shall have been effected or obtained free of any conditions
not acceptable to the Board.

         (c) Tax Undertakings. In the case of an option that is not an Incentive
Option, the Board may require the optionholder to remit to the Company an amount
sufficient to satisfy any federal, state or local withholding tax requirements
(or make other arrangements satisfactory to the Company with regard to such
taxes, including withholding from regular cash compensation, providing other
security to the Company, or remitting or foregoing the receipt of property,
including Stock, having a fair market value (as determined by the Board in good
faith in its discretion) on the date of exercise sufficient to meet such
potential liability prior to the delivery of any Shares pursuant to the exercise
of the option. In the case of an Incentive Option, if at the time the option is
exercised the Board determines that under applicable law and regulations the
Company could be liable for the withholding of any federal or state tax with
respect to a disposition of the Shares received upon exercise, the Board may
require the optionholder to agree (i) to inform the Company promptly of any
disposition (within the meaning of Section 424(c) of the Code and the
regulations thereunder) of Shares received upon exercise, and (ii) to give such
security as the Board deems adequate to meet the potential liability of the
Company for the withholding of tax, and to augment such security from time to
time in any amount reasonably deemed necessary by the Board to preserve the
adequacy of such security.

         (d) Evidence of Authority. If an option is exercised by the legal
representative of a deceased optionholder or by a person to whom the option has
been transferred by the optionholder's will or by applicable laws of descent and
distribution, the Company shall not be obligated to deliver Shares until
satisfied as to the authority of the person exercising the option.

         (e) Restrictions on Transfer of Stock. If the sale of Shares has not
been registered under the Securities Act of 1933, as amended, or under
applicable state securities laws, the Company may require, as a condition to
exercise of an option, such representations or agreements from the optionholder
as counsel for the Company may consider appropriate to avoid violation of such
Act or such state securities laws and may require that the certificates
evidencing such Shares bear an appropriate legend restricting transfer. In
addition, the Board may require as conditions to the grant or exercise of any
option that the optionholder

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agree in writing to (i) restrictions on the transfer of Shares, (ii) a right of
first refusal of the Company to repurchase Shares in the event of termination of
employment or death or disability. Such restrictions and rights on the part of
the Company shall be identified in the instrument granting the option.

10.  PAYMENT FOR SHARES.
     ------------------

         (a) Exercise Price. The exercise price for Shares purchased under an
option shall b e paid as follows: (i) in cash or by certified check, bank draft
or money order payable to the order of the Company; (ii) if permitted by the
terms of the instrument granting the option, by the delivery of shares of Stock
having a fair market value (as determined by the Board in good faith in its
reasonable discretion) on the date of exercise equal to the exercise price; or
(iii) by a combination of cash and Stock; provided, however, that payment of the
exercise price by delivery of shares of Common Stock of the Company owned by
such optionholder may be made only if such payment does not result in a charge
to earnings for financial accounting purposes as determined by the Board, unless
the Board otherwise permits such payment by delivery of shares of Common Stock.

         (b) Promissory Note. To the extent permitted by any applicable margin
regulations of the Board of Governors of the Federal Reserve System and other
provisions of applicable law, the instrument granting an option may permit the
exercise price for Shares to be paid by payment of at least the par value by a
combination of cash and Stock as provided above, and delivery to the Company of
the optionholder's promissory note for the balance of the exercise price. Unless
otherwise specified by the Board in the instrument granting the option, such
note (i) shall bear interest at least equal to the Applicable Federal Rate, as
determined under Section 1274(d) of the Code and published by the Service on a
monthly basis, in effect for the month of exercise, (ii) shall be a full
recourse note, (iii) shall be secured by a pledge of the Shares acquired by
exercising the option, and (iv) shall be payable in equal annual installments of
principal and interest over a period of not more than five years after the
exercise date (except that any such note shall be payable on demand in the event
of termination of employment). Any such promissory note shall be in a form
satisfactory to the Company.

11.  NO RIGHTS AS STOCKHOLDER. Optionholders shall not have the rights of
stockholders with regard to options granted under this Plan, except as to Shares
actually purchased pursuant to such options.

12.  NONTRANSFERABILITY OF OPTIONS. Each option granted under this Plan shall be
transferable only by will or the laws of descent and distribution and shall be
exercisable during the lifetime of the person to whom the option is granted only
by such person. Except as permitted by the preceding sentence, no option granted
under this Plan or any of the rights and privileges thereby conferred shall be
transferred, assigned, pledged, hypothecated or otherwise disposed of in any way
(by operation of law or otherwise), and no such option, right or privilege shall
be subject to execution, attachment or similar process. Upon any attempt to so
transfer, assign, pledge, hypothecate or otherwise dispose of any such option,
right or privilege contrary to the provisions hereof, or upon the levy of any
attachment or similar process upon such option, right or privilege, the option
and such rights and privileges shall immediately become null and void.
Notwithstanding the above provisions of this Section 12, any option granted
under this Plan may be pledged or hypothecated to secure an obligation to the
Company.

13.  TERMINATION OF EMPLOYMENT; DEATH OR DISABILITY.
     ----------------------------------------------

         (a) Termination in General. Upon termination of the employment of an
optionholder, any unexercised options shall terminate immediately, except as
provided in Subsections (b), (c) and (d) below. For purposes of this Section 13,
employment shall not be considered terminated (i) in the case of sick leave or
other bona fide leave of absence approved for purposes of this Plan by the
Board, so long as the employee's right to re-employment is guaranteed either by
statute or by contract, or (ii) in the case of a transfer of employment among
the Company and its subsidiaries, or to the employment of a corporation (or a
parent or subsidiary corporation of such corporation) issuing or assuming an
option, which in the case of an Incentive Option is a transaction to which
Section 424(a) of the Code applies. For all purposes of this Section 13, the
term "employment" shall include the continuing relationships of optionholders to
the Company as Directors, consultants, advisers, independent contractors and
other service providers;

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provided, however, that notwithstanding the foregoing, in the discretion of the
Board, the instrument granting options to any of the foregoing persons may
provide that the option may remain in force and effect notwithstanding the
termination of the relationship between any such person and the Company.

         (b) Termination Not for Cause. If such termination was not "for cause"
(as hereinafter defined), the optionholder may exercise any option which was
otherwise exercisable on the date of termination for a period ending on the
earlier of (i) the expiration of three months after the date of such
termination, (ii) the expiration date of such option as fixed pursuant to the
first sentence of Section 7(c), and (iii) the termination of such option
pursuant to the provisions of Section 14. For purposes hereof, the term "for
cause" shall mean only (i) the willful or reckless failure by the optionholder
to perform his duties under, or willful or reckless violation of, any written
employment or consulting agreement (other than a failure resulting from the
optionholder's death or disability), which failure or violation shall not have
been cured within the cure period, if any, provided in such agreement; (ii) the
commission by the optionholder of an act of fraud or theft against the Company
or any of its subsidiaries; or (iii) the conviction of the optionholder of (or
the plea by the optionholder of nolo contendere to) any felony.

         (c) Death. If termination of employment results from the optionholder's
death, any option which was otherwise exercisable by such optionholder as of the
time immediately before his or her death shall be exercisable by the
optionholder's estate or by any person who acquired the options by bequest or
inheritance for a period ending on the earlier of (i) one year after the death
of the optionholder, (ii) the expiration date of such option as fixed pursuant
to the first sentence of Section 7(c), and (iii) the termination of such option
pursuant to the provisions of Section 14. The Board may permit any option to be
exercised for up to the total number of Shares subject to the option, or grant
an option which by its terms is exercisable for up to the total number of Shares
subject to the option, at any time within one year after the death of the
optionholder, consistent with the above provisions.

         (d) Disability. If the termination of employment results from the
optionholder's disability, any option which was otherwise exercisable by such
optionholder immediately prior to the termination of his employment shall be
exercisable by him or her (or his or her legal representative) for a period
ending on the earlier of (i) one year after such termination, (ii) the
expiration of such option pursuant to the provisions of Section 14. The Board
may permit any option to be exercised for up to the total number of Shares
subject to the option, or grant an option which by its terms is exercisable for
up to the total number of Shares subject to the option, at any time within one
year after termination of employment, consistent with the above provisions. The
term "disability" shall for this purpose be defined as such term is defined in
section 22(e)(3) of the Code.

14.  REORGANIZATIONS; DISSOLUTION.
     ----------------------------

         (a) Substitute Options. If by reason of a corporate merger,
consolidation, acquisition of property or stock separation, reorganization, or
liquidation the Board shall authorize the issuance or assumption of a stock
option in a transaction to which Section 424(a) of the Code applies, then,
notwithstanding any other provision of this Plan, the Board may grant an option
upon such terms and conditions as it may deem appropriate for the purpose of
assumption of the old option, or substitution of a new option for the old
option, in conformity with the provisions of said Section 424(a) of the Code and
the Regulations thereunder, and any such option shall not reduce the number of
shares otherwise available for issuance under this Plan.

         (b) Termination of Options. In the event of a Change in Control of the
Company (as defined in subsection (c) below, and in anticipation thereof if
required by the circumstances, the Board, in its sole discretion, may (i)
accelerate the exercisability, prior to the effective date of such Change in
Control, of all outstanding options granted under this Plan (and redesignate as
Nonqualified Options any options or portions thereof that were originally
designated as Incentive Options but that no longer so qualify under Section 422
of the Code), (ii) arrange, if there is a surviving or acquiring corporation,
subject to the consummation of a Change of Control, to have that corporation or
an affiliate of that corporation grant to employees and other optionholders
replacement options with substantially similar or, if not adverse to the
optionholders, different provisions with respect to exercisability (upon which
grant the options granted

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under this Plan shall immediately terminate and be of no further force or
effect) which, however, in the case of Incentive Options, satisfy, in the
determination of the Board, the requirements of Section 424(a) of the Code,
(iii) cancel all outstanding options in exchange for consideration in cash or in
kind in an amount equal to the value of the Shares, as determined by the Board
in good faith, the optionholder would have received had the option been
exercised (to the extent then exercisable or to a greater extent, including in
full, as the Board may determine) less the option price therefor (upon which
cancellation such options shall immediately terminate and be of no further force
or effect), (iv) permit the purchaser of the Company's stock or assets to
deliver to the optionholders the same kind of consideration that is delivered to
the stockholders of the Company in cancellation of such options in an amount
equal to the value of the Shares, as determined by the Board in good faith, the
optionholder would have received had the option been exercised (to the extent
then exercisable or to a greater extent, including in full, as the Board may
determine), less the option price therefor, or (v) take any combination (or
none) of the foregoing actions.

         (c) Definition of "Change of Control". For purposes of this Plan, a
"Change in Control" shall mean and include any of the following:

                  (i)      a merger or consolidation of the Company with or into
any other corporation or other business entity in which the Company is the
surviving corporation (except one in which the holders of capital stock of the
Company immediately prior to such merger or consolidation continue to hold at
least a majority of the outstanding securities having the right to vote in an
election of the Board of Directors ("Voting Stock") of the Company); or any such
merger or consolidation in which the Company is not the surviving corporation;

                  (ii)     a sale, lease, exchange or other transfer (in one
transaction or a related series of transactions) of all or substantially all of
the Company's assets;

                  (iii)    the acquisition by any person or any group of persons
(other than the Company, any of its direct or indirect subsidiaries, or any
trustee, fiduciary or other person or entity holding securities under any
employee benefit plan or trust of the Company or any of its direct or indirect
subsidiaries) acting together in any transaction or related series of
transactions, of such number of shares of the Company's Voting Stock as causes
such person, or group of persons, to own beneficially, directly or indirectly,
as of the time immediately after such transaction or series of transactions, 50%
or more of the combined voting power of the Voting Stock of the Company other
than as a result of an acquisition of securities directly from the Company, or
solely as a result of an acquisition of securities by the Company which by
reducing the number of shares of the Voting Stock outstanding increases the
proportionate voting power represented by the Voting Stock owned by any such
person to 50% or more of the combined voting power of such Voting Stock; and

                  (iv)     a change in the composition of the Company's Board of
Directors following a tender offer or proxy contest, as a result of which
persons who, immediately prior to a tender offer or proxy contest, constituted
the Company's Board of Directors shall cease to constitute at least a majority
of the members of the Board of Directors.

         (d) Dissolution or Liquidation. Upon the dissolution or liquidation of
the Company, all outstanding options granted under this Plan shall terminate,
but each optionholder shall have the right, immediately prior to such
dissolution or liquidation, to exercise his or her options to the extent then
exercisable.

15.  EMPLOYMENT RIGHTS AND OTHER BENEFITS. Neither the adoption of this Plan nor
the grant of options shall confer upon any employee any right to continued
employment with the Company or any parent or subsidiary or affect in any way the
right of the Company or such parent or subsidiary to terminate the employment of
an employee at any time. Except as specifically provided by the Board in any
particular case, the loss of existing or potential profit in options granted
under this Plan shall not constitute an element of damages in the event of
termination of the employment of an employee even if the termination is in
violation of an obligation of the Company to the employee by contract or
otherwise. Nothing in this Plan shall restrict the authority of the Board to
grant stock options or to award bonuses or other benefits to

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employees or others otherwise than pursuant to this Plan. For purposes of this
Section 15, the term "employee" shall include those persons granted options
pursuant to this Plan who are not employees of the Company, and the term
"employment" shall include the arrangement or relationship between the Company
and any such person.

16.  DISCONTINUANCE, CANCELLATION, AMENDMENT AND TERMINATION. The Board may at
any time abandon this Plan or discontinue granting options under this Plan. With
the consent of the optionholder, the Board may at any time cancel an existing
option in whole or in part and grant another option for such number of shares as
the Board specifies. The Board may at any time amend this Plan for the purpose
of satisfying the requirements of Section 422 of the Code or of any changes in
applicable laws or regulations or for any other purpose which may at the time be
permitted by law, or may at any time terminate this Plan as to any further
grants of options, provided that (except to the extent expressly required or
permitted herein above) no such amendment shall, without the approval of the
stockholders of the Company by at least a majority vote at a duly held meeting
(or by written consent as provided by applicable law), (a) increase the maximum
number of shares for which options may be granted under this Plan, (b) change
the group of employees eligible to receive options under this Plan, (c) reduce
the price at which Incentive Options may be granted, (d) extend the time within
which options may be granted, (e) alter this Plan in such a way that Incentive
Options already granted hereunder would not be considered Incentive Options
under Section 422 of the Code, (f) amend the provisions of this Section 16, or
(g) make an y other change in this Plan which requires stockholder approval
under applicable law or regulations, including any approval requirement which is
a prerequisite for exemptive relief under Section 16 of the Exchange Act. The
termination or any modification or amendment of this Plan shall not adversely
affect the rights of any optionholder under any option previously granted
without his or her consent.

17.  COMPLIANCE WITH RULE 16b-3. It is intended that the provisions of this Plan
and any options granted thereunder to a person subject to the reporting
requirements of Section 16(a) of the Exchange Act shall comply in all respects
with the terms and conditions of Rule 16b-3 promulgated under the Exchange Act
or any successor provisions thereto. Any agreement granting options shall
contain such provisions as are necessary to assure such compliance. To the
extent that any provision hereof is found not to be in compliance with such
Rule, such provision shall be deemed to be modified so as to be in compliance
with such Rule or, if such modification is not possible, shall be deemed to be
null and void, as it relates to a recipient subject to Section 16(a) of the
Exchange Act.

ADOPTED by the Board of Directors of SupplierMarket.com, Inc. as of the 2nd day
of June, 1999, and amended by the Board of Directors as of the 28th day of June,
1999.

APPROVED by the stockholders of SupplierMarket.com, Inc. as of the 2nd day of
June, 1999, and amended by the stockholders as of the 28th day of June, 1999.

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                               FIRST AMENDMENT TO
                            SUPPLIERMARKET.COM, INC.
                             1999 STOCK OPTION PLAN
                           Amended as of April 4, 2001

         I.       Purpose of the Amendment.
                  ------------------------

         On or about August 28, 2000, the Company consummated a merger among
Ariba, Inc. and Eli Merger Corporation, a wholly-owned subsidiary of Ariba,
Inc., and suppliermarket.com, Inc., a Delaware corporation (the "Merger"),
pursuant to which the suppliermarket.com, Inc. 1999 Stock Option Plan (the
"Plan") was assumed by Ariba, Inc., including all outstanding options under the
Plan. As a result of the Merger and the assumption of the Plan, Ariba, Inc.
wishes to amend the Plan to include Ariba, Inc. within the definition of
"Company" under the Plan in order to permit Ariba, Inc. to grant options under
the assumed Plan, and to permit alternate payment methods for the exercise of
options under the assumed Plan.

         II.      Amendment to Plan.
                  -----------------

         As of April 4, 2001, the Plan is hereby amended as follows:

                  (a)      The first sentence in the first paragraph of the Plan
is hereby amended by (i) substituting the words "Ariba, Inc." for the words
"suppliermarket.com, Inc.," (ii) changing the number "2,625,962" for the number
"2,472,690," and (iii) changing the par value to $.02. The first sentence of the
first paragraph of the Plan shall henceforth read as follows:

                  This Plan (this "Plan") of Ariba, Inc. (the "Company")
                  provides that options for up to 2,472,690 shares (the
                  "Shares") of the Company's Common Stock, $.02 par value per
                  share (the "Stock"), may be granted to employees of the
                  Company and its subsidiaries, as defined below, and to others
                  who are in a position to make significant contributions to the
                  success of the Company and its subsidiaries.

                  (b)      Section 10(a) is hereby amended by deleting the word
"or" before the Subsection "(iii)" and by adding the phrase "or (iv) by any
method provided for by the Board or Committee in its discretion that is
permitted by law." Section 10(a) shall henceforth read as follows:

                  Exercise Price. The exercise price for Shares purchased under
                  an option shall be paid as follows: (i) in cash or by
                  certified check, bank draft or money order payable to the
                  order of the Company; (ii) if permitted by the terms of the
                  instrument granting the option, by the delivery of shares of
                  Stock having a fair market value (as determined by the Board
                  in good faith in its reasonable discretion) on the date of
                  exercise equal to the exercise price; (iii) by a combination
                  of cash and

<PAGE>

                  Stock; provided, however, that payment of the exercise price
                  by delivery of shares of Common Stock of the Company owned by
                  such optionholder may be made only if such payment does not
                  result in a charge to earnings for financial accounting
                  purposes as determined by the Board, unless the Board
                  otherwise permits such payment by delivery of shares of Common
                  Stock; or (iv) by any method provided for by the Board or
                  Committee in its discretion that is permitted by law.

         III.     Effective Date.
                  --------------

         This First Amendment shall be effective upon its approval by the
Compensation Committee of the Board of Directors of Ariba, Inc.

         IV.      Effect on the Plan.
                  ------------------

         Except as expressly amended hereby, the Plan shall remain unchanged and
in full force and effect and is hereby ratified and confirmed.

                                        2<PAGE>

                                                                   EXHIBIT 10.31

                              TRADINGDYNAMICS, INC.

                                 1999 STOCK PLAN

                             ADOPTED DECEMBER, 1999

<PAGE>

                                TABLE OF CONTENTS

                                                                        Page No.
                                                                        --------

SECTION 1.  ESTABLISHMENT AND PURPOSE..........................................1

SECTION 2.  ADMINISTRATION.....................................................1

   (a)  Committees of the Board of Directors...................................1
   (b)  Authority of the Board of Directors....................................1

SECTION 3.  ELIGIBILITY........................................................1

   (a)  General Rule...........................................................1
   (b)  Ten-Percent Shareholders...............................................1

SECTION 4.  STOCK SUBJECT TO PLAN..............................................2

   (a)  Basic Limitation.......................................................2
   (b)  Additional Shares......................................................2

SECTION 5.  TERMS AND CONDITIONS OF AWARDS OR SALES............................2

   (a)  Stock Purchase Agreement...............................................2
   (b)  Duration of Offers and Nontransferability of Rights....................2
   (c)  Purchase Price.........................................................2
   (d)  Withholding Taxes......................................................2
   (e)  Restrictions on Transfer of Shares and Minimum Vesting.................2
   (f)  Accelerated Vesting....................................................3

SECTION 6.  TERMS AND CONDITIONS OF OPTIONS....................................3

   (a)  Stock Option Agreement.................................................3
   (b)  Number of Shares.......................................................3
   (c)  Exercise Price.........................................................3
   (d)  Withholding Taxes......................................................3
   (e)  Exercisability.........................................................3
   (f)  Accelerated Exercisability.............................................3
   (g)  Basic Term.............................................................4
   (h)  Nontransferability.....................................................4
   (i)  Termination of Service (Except by Death)...............................4
   (j)  Leaves of Absence......................................................4
   (k)  Death of Optionee......................................................5
   (l)  No Rights as a Shareholder.............................................5
   (m)  Modification, Extension and Assumption of Options......................5
   (n)  Restrictions on Transfer of Shares and Minimum Vesting.................5
   (o)  Accelerated Vesting....................................................5

                                        i

<PAGE>

SECTION 7.  PAYMENT FOR SHARES.................................................6

   (a)  General Rule...........................................................6
   (b)  Surrender of Stock.....................................................6
   (c)  Services Rendered......................................................6
   (d)  Promissory Note........................................................6
   (e)  Exercise/Sale..........................................................6
   (f)  Exercise/Pledge........................................................6

SECTION 8.  ADJUSTMENT OF SHARES...............................................6

   (a)  General................................................................6
   (b)  Mergers and Consolidations.............................................7
   (c)  Reservation of Rights..................................................7

SECTION 9.  SECURITIES LAWS REQUIREMENTS.......................................7

SECTION 10. NO RETENTION RIGHTS................................................7

SECTION 11. DURATION AND AMENDMENTS............................................8

   (a)  Term of the Plan.......................................................8
   (b)  Right to Amend or Terminate the Plan...................................8
   (c)  Effect of Amendment or Termination.....................................8

SECTION 12. DEFINITIONS........................................................8

<PAGE>

                      TRADINGDYNAMICS, INC. 1999 STOCK PLAN

SECTION 1.  ESTABLISHMENT AND PURPOSE.

         The purpose of the Plan is to offer selected individuals an opportunity
to acquire a proprietary interest in the success of the Company, or to increase
such interest, by purchasing Shares of the Company's Stock. The Plan provides
both for the direct award or sale of Shares and for the grant of Options to
purchase Shares. Options granted under the Plan may include Nonstatutory Options
as well as ISOs intended to qualify under Section 422 of the Code.

         Capitalized terms are defined in Section 12.

SECTION 2.  ADMINISTRATION.

         (a)      Committees of the Board of Directors. The Plan may be
administered by one or more Committees. Each Committee shall consist of two or
more members of the Board of Directors who have been appointed by the Board of
Directors. Each Committee shall have such authority and be responsible for such
functions as the Board of Directors has assigned to it. If no Committee has been
appointed, the entire Board of Directors shall administer the Plan. Any
reference to the Board of Directors in the Plan shall be construed as a
reference to the Committee (if any) to whom the Board of Directors has assigned
a particular function.

         (b)      Authority of the Board of Directors. Subject to the provisions
of the Plan, the Board of Directors shall have full authority and discretion to
take any actions it deems necessary or advisable for the administration of the
Plan. All decisions, interpretations and other actions of the Board of Directors
shall be final and binding on all Purchasers, all Optionees and all persons
deriving their rights from a Purchaser or Optionee.

SECTION 3.  ELIGIBILITY.

         (a)      General Rule. Only Employees, Outside Directors and
Consultants shall be eligible for the grant of Options or the direct award or
sale of Shares. Only Employees shall be eligible for the grant of ISOs.

         (b)      Ten-Percent Shareholders. An individual who owns more than 10%
of the total combined voting power of all classes of outstanding stock of the
Company, its Parent or any of its Subsidiaries shall not be eligible for
designation as an Optionee holding an ISO unless (i) the Exercise Price is at
least 110% of the Fair Market Value of a Share on the date of grant, and (ii) in
the case of an ISO, such ISO by its terms is not exercisable after the
expiration of five years from the date of grant. For purposes of this Subsection
(b), in determining stock ownership, the attribution rules of Section 424(d) of
the Code shall be applied.

                                        1

<PAGE>

SECTION 4.  STOCK SUBJECT TO PLAN.

         (a)      Basic Limitation. The aggregate number of Shares that may be
issued under the Plan (upon exercise of Options or other rights to acquire
Shares) shall not exceed 2,500,000 Shares, subject to adjustment pursuant to
Section 8. The number of Shares that are subject to Options or other rights
outstanding at any time under the Plan shall not exceed the number of Shares
that then remain available for issuance under the Plan. The Company, during the
term of the Plan, shall at all times reserve and keep available sufficient
Shares to satisfy the requirements of the Plan.

         (b)      Additional Shares. In the event that any outstanding Option or
other right for any reason expires or is canceled or otherwise terminated, the
Shares allocable to the unexercised portion of such Option or other right shall
again be available for the purposes of the Plan. In the event that Shares issued
under the Plan are reacquired by the Company pursuant to any forfeiture
provision, right of repurchase or right of first refusal, such Shares shall
again be available for the purposes of the Plan, except that the aggregate
number of Shares which may be issued upon the exercise of ISOs shall in no event
exceed 2,500,000 Shares (subject to adjustment pursuant to Section 8).

SECTION 5.  TERMS AND CONDITIONS OF AWARDS OR SALES.

         (a)      Stock Purchase Agreement. Each award or sale of Shares under
the Plan (other than upon exercise of an Option) shall be evidenced by a Stock
Purchase Agreement between the Purchaser and the Company. Such award or sale
shall be subject to all applicable terms and conditions of the Plan and may be
subject to any other terms and conditions which are not inconsistent with the
Plan and which the Board of Directors deems appropriate for inclusion in a Stock
Purchase Agreement. The provisions of the various Stock Purchase Agreements
entered into under the Plan need not be identical.

         (b)      Duration of Offers and Nontransferability of Rights. Any right
to acquire Shares under the Plan (other than an Option) shall automatically
expire if not exercised by the Purchaser within 30 days after the grant of such
right was communicated to the Purchaser by the Company. Such right shall not be
transferable and shall be exercisable only by the Purchaser to whom such right
was granted.

         (c)      Purchase Price. The Purchase Price of Shares to be offered
under the Plan shall not be less than the par value of such Shares. Subject to
the preceding sentence, the Purchase Price shall be determined by the Board of
Directors at its sole discretion. The Purchase Price shall be payable in a form
described in Section 7.

         (d)      Withholding Taxes. As a condition to the purchase of Shares,
the Purchaser shall make such arrangements as the Board of Directors may require
for the satisfaction of any federal, state, local or foreign withholding tax
obligations that may arise in connection with such purchase.

         (e)      Restrictions on Transfer of Shares and Minimum Vesting. Any
Shares awarded or sold under the Plan shall be subject to such special
forfeiture conditions, rights of

                                        2

<PAGE>

repurchase, rights of first refusal and other transfer restrictions as the Board
of Directors may determine. Such restrictions shall be set forth in the
applicable Stock Purchase Agreement and shall apply in addition to any
restrictions that may apply to holders of Shares generally.

         (f)      Accelerated Vesting. Unless the applicable Stock Purchase
Agreement provides otherwise, any right to repurchase a Purchaser's Shares at
the original Purchase Price (if any) upon termination of the Purchaser's Service
shall lapse and all of such Shares shall become vested if (i) the Company is
subject to a Change in Control before the Purchaser's Service terminates and
(ii) the repurchase right is not assigned to the entity that employs the
Purchaser immediately after the Change in Control or to its parent or
subsidiary.

SECTION 6.  TERMS AND CONDITIONS OF OPTIONS.

         (a)      Stock Option Agreement. Each grant of an Option under the Plan
shall be evidenced by a Stock Option Agreement between the Optionee and the
Company. Such Option shall be subject to all applicable terms and conditions of
the Plan and may be subject to any other terms and conditions which are not
inconsistent with the Plan and which the Board of Directors deems appropriate
for inclusion in a Stock Option Agreement. The provisions of the various Stock
Option Agreements entered into under the Plan need not be identical.

         (b)      Number of Shares. Each Stock Option Agreement shall specify
the number of Shares that are subject to the Option and shall provide for the
adjustment of such number in accordance with Section 8. The Stock Option
Agreement shall also specify whether the Option is an ISO or a Nonstatutory
Option.

         (c)      Exercise Price. Each Stock Option Agreement shall specify the
Exercise Price. The Exercise Price of an ISO shall not be less than 100% of the
Fair Market Value of a Share on the date of grant, and a higher percentage may
be required by Section 3(b). The Exercise Price of a Nonstatutory Option shall
not be less than the par value of a Share on the date of grant. Subject to the
preceding two sentences, the Exercise Price under any Option shall be determined
by the Board of Directors at its sole discretion. The Exercise Price shall be
payable in a form described in Section 7.

         (d)      Withholding Taxes. As a condition to the exercise of an
Option, the Optionee shall make such arrangements as the Board of Directors may
require for the satisfaction of any federal, state, local or foreign withholding
tax obligations that may arise in connection with such exercise. The Optionee
shall also make such arrangements as the Board of Directors may require for the
satisfaction of any federal, state, local or foreign withholding tax obligations
that may arise in connection with the disposition of Shares acquired by
exercising an Option.

         (e)      Exercisability. Each Stock Option Agreement shall specify the
date when all or any installment of the Option is to become exercisable. The
exercisability provisions of any Stock Option Agreement shall be determined by
the Board of Directors at its sole discretion.

         (f)      Accelerated Exercisability. Unless the applicable Stock Option
Agreement provides otherwise, all of an Optionee's Options shall become
exercisable in full if (i) the Company is subject to a Change in Control before
the Optionee's Service terminates, (ii) such

                                        3

<PAGE>

Options do not remain outstanding, (iii) such Options are not assumed by the
surviving corporation or its parent and (iv) the surviving corporation or its
parent does not substitute options with substantially the same terms for such
Options.

         (g)      Basic Term. The Stock Option Agreement shall specify the term
of the Option. The term shall not exceed 10 years from the date of grant, and a
shorter term may be required by Section 3(b). Subject to the preceding sentence,
the Board of Directors at its sole discretion shall determine when an Option is
to expire.

         (h)      Nontransferability. No Option shall be transferable by the
Optionee other than by beneficiary designation, will or the laws of descent and
distribution. An Option may be exercised during the lifetime of the Optionee
only by the Optionee or by the Optionee's guardian or legal representative. No
Option or interest therein may be transferred, assigned, pledged or hypothecated
by the Optionee during the Optionee's lifetime, whether by operation of law or
otherwise, or be made subject to execution, attachment or similar process.

         (i)      Termination of Service (Except by Death). If an Optionee's
Service terminates for any reason other than the Optionee's death, then the
Optionee's Options shall expire on the earliest of the following occasions:

                  (i)      The expiration date determined pursuant to Subsection
         (g) above;

                  (ii)     The date three months after the termination of the
         Optionee's Service for any reason other than Disability, or such later
         date as the Board of Directors may determine; or

                  (iii)    The date six months after the termination of the
         Optionee's Service by reason of Disability, or such later date as the
         Board of Directors may determine.

The Optionee may exercise all or part of the Optionee's Options at any time
before the expiration of such Options under the preceding sentence, but only to
the extent that such Options had become exercisable before the Optionee's
Service terminated (or became exercisable as a result of the termination) and
the underlying Shares had vested before the Optionee's Service terminated (or
vested as a result of the termination). The balance of such Options shall lapse
when the Optionee's Service terminates. In the event that the Optionee dies
after the termination of the Optionee's Service but before the expiration of the
Optionee's Options, all or part of such Options may be exercised (prior to
expiration) by the executors or administrators of the Optionee's estate or by
any person who has acquired such Options directly from the Optionee by
beneficiary designation, bequest or inheritance, but only to the extent that
such Options had become exercisable before the Optionee's Service terminated (or
became exercisable as a result of the termination) and the underlying Shares had
vested before the Optionee's Service terminated (or vested as a result of the
termination).

         (j)      Leaves of Absence. For purposes of Subsection (i) above,
Service shall be deemed to continue while the Optionee is on a bona fide leave
of absence, if such leave was approved by the Company in writing and if
continued crediting of Service for this purpose is

                                        4

<PAGE>

expressly required by the terms of such leave or by applicable law (as
determined by the Company).

         (k)      Death of Optionee. If an Optionee dies while the Optionee is
in Service, then the Optionee's Options shall expire on the earlier of the
following dates:

                  (i)      The expiration date determined pursuant to Subsection
         (g) above; or

                  (ii)     The date 12 months after the Optionee's death.

All or part of the Optionee's Options may be exercised at any time before the
expiration of such Options under the preceding sentence by the executors or
administrators of the Optionee's estate or by any person who has acquired such
Options directly from the Optionee by beneficiary designation, bequest or
inheritance, but only to the extent that such Options had become exercisable
before the Optionee's death or became exercisable as a result of the death. The
balance of such Options shall lapse when the Optionee dies.

         (l)      No Rights as a Shareholder. An Optionee, or a transferee of an
Optionee, shall have no rights as a shareholder with respect to any Shares
covered by the Optionee's Option until such person becomes entitled to receive
such Shares by filing a notice of exercise and paying the Exercise Price
pursuant to the terms of such Option.

         (m)      Modification, Extension and Assumption of Options. Within the
limitations of the Plan, the Board of Directors may modify, extend or assume
outstanding Options or may accept the cancellation of outstanding Options
(whether granted by the Company or another issuer) in return for the grant of
new Options for the same or a different number of Shares and at the same or a
different Exercise Price. The foregoing notwithstanding, no modification of an
Option shall, without the consent of the Optionee, impair the Optionee's rights
or increase the Optionee's obligations under such Option.

         (n)      Restrictions on Transfer of Shares and Minimum Vesting. Any
Shares issued upon exercise of an Option shall be subject to such special
forfeiture conditions, rights of repurchase, rights of first refusal and other
transfer restrictions as the Board of Directors may determine. Such restrictions
shall be set forth in the applicable Stock Option Agreement and shall apply in
addition to any restrictions that may apply to holders of Shares generally.

         (o)      Accelerated Vesting. Unless the applicable Stock Option
Agreement provides otherwise, any right to repurchase an Optionee's Shares at
the original Exercise Price upon termination of the Optionee's Service shall
lapse and all of such Shares shall become vested if (i) the Company is subject
to a Change in Control before the Optionee's Service terminates and (ii) the
repurchase right is not assigned to the entity that employs the Optionee
immediately after the Change in Control or to its parent or subsidiary.

                                        5

<PAGE>

SECTION 7.  PAYMENT FOR SHARES.

         (a)      General Rule. The entire Purchase Price or Exercise Price of
Shares issued under the Plan shall be payable in cash or cash equivalents at the
time when such Shares are purchased, except as otherwise provided in this
Section 7.

         (b)      Surrender of Stock. To the extent that a Stock Option
Agreement so provides, all or any part of the Exercise Price may be paid by
surrendering, or attesting to the ownership of, Shares that are already owned by
the Optionee. Such Shares shall be surrendered to the Company in good form for
transfer and shall be valued at their Fair Market Value on the date when the
Option is exercised. The Optionee shall not surrender, or attest to the
ownership of, Shares in payment of the Exercise Price if such action would cause
the Company to recognize compensation expense (or additional compensation
expense) with respect to the Option for financial reporting purposes.

         (c)      Services Rendered. At the discretion of the Board of
Directors, Shares may be awarded under the Plan in consideration of services
rendered to the Company, a Parent or a Subsidiary prior to the award.

         (d)      Promissory Note. To the extent that a Stock Option Agreement
or Stock Purchase Agreement so provides, all or a portion of the Exercise Price
or Purchase Price (as the case may be) of Shares issued under the Plan may be
paid with a full-recourse promissory note. The Shares shall be pledged as
security for payment of the principal amount of the promissory note and interest
thereon. The interest rate payable under the terms of the promissory note shall
not be less than the minimum rate (if any) required to avoid the imputation of
additional interest under the Code. Subject to the foregoing, the Board of
Directors (at its sole discretion) shall specify the term, interest rate,
amortization requirements (if any) and other provisions of such note.

         (e)      Exercise/Sale. To the extent that a Stock Option Agreement so
provides, and if Stock is publicly traded, payment may be made all or in part by
the delivery (on a form prescribed by the Company) of an irrevocable direction
to a securities broker approved by the Company to sell Shares and to deliver all
or part of the sales proceeds to the Company in payment of all or part of the
Exercise Price and any withholding taxes.

         (f)      Exercise/Pledge. To the extent that a Stock Option Agreement
so provides, and if Stock is publicly traded, payment may be made all or in part
by the delivery (on a form prescribed by the Company) of an irrevocable
direction to pledge Shares to a securities broker or lender approved by the
Company, as security for a loan, and to deliver all or part of the loan proceeds
to the Company in payment of all or part of the Exercise Price and any
withholding taxes.

SECTION 8.  ADJUSTMENT OF SHARES.

         (a)      General. In the event of a subdivision of the outstanding
Stock, a declaration of a dividend payable in Shares, a declaration of an
extraordinary dividend payable in a form other than Shares in an amount that has
a material effect on the Fair Market Value of the Stock, a

                                        6

<PAGE>

combination or consolidation of the outstanding Stock into a lesser number of
Shares, a recapitalization, a spin-off, a reclassification or a similar
occurrence, the Board of Directors shall make appropriate adjustments in one or
more of (i) the number of Shares available for future grants under Section 4,
(ii) the number of Shares covered by each outstanding Option or (iii) the
Exercise Price under each outstanding Option.

         (b)      Mergers and Consolidations. In the event that the Company is a
party to a merger or consolidation, outstanding Options shall be subject to the
agreement of merger or consolidation. Such agreement, without the Optionees'
consent, may provide for:

                  (i)      The continuation of such outstanding Options by the
         Company (if the Company is the surviving corporation);

                  (ii)     The assumption of the Plan and such outstanding
         Options by the surviving corporation or its parent;

                  (iii)    The substitution by the surviving corporation or its
         parent of options with substantially the same terms for such
         outstanding Options; or

                  (iv)     The cancellation of such outstanding Options without
         payment of any consideration.

         (c)      Reservation of Rights. Except as provided in this Section 8,
an Optionee or Purchaser shall have no rights by reason of (i) any subdivision
or consolidation of shares of stock of any class, (ii) the payment of any
dividend or (iii) any other increase or decrease in the number of shares of
stock of any class. Any issuance by the Company of shares of stock of any class,
or securities convertible into shares of stock of any class, shall not affect,
and no adjustment by reason thereof shall be made with respect to, the number or
Exercise Price of Shares subject to an Option. The grant of an Option pursuant
to the Plan shall not affect in any way the right or power of the Company to
make adjustments, reclassifications, reorganizations or changes of its capital
or business structure, to merge or consolidate or to dissolve, liquidate, sell
or transfer all or any part of its business or assets.

SECTION 9.  SECURITIES LAW REQUIREMENTS.

         Shares shall not be issued under the Plan unless the issuance and
delivery of such Shares comply with (or are exempt from) all applicable
requirements of law, including (without limitation) the Securities Act of 1933,
as amended, the rules and regulations promulgated thereunder, state securities
laws and regulations, and the regulations of any stock exchange or other
securities market on which the Company's securities may then be traded.

SECTION 10. NO RETENTION RIGHTS.

         Nothing in the Plan or in any right or Option granted under the Plan
shall confer upon the Purchaser or Optionee any right to continue in Service for
any period of specific duration or interfere with or otherwise restrict in any
way the rights of the Company (or any Parent or Subsidiary employing or
retaining the Purchaser or Optionee) or of the Purchaser or Optionee,

                                        7

<PAGE>

which rights are hereby expressly reserved by each, to terminate his or her
Service at any time and for any reason, with or without cause.

SECTION 11. DURATION AND AMENDMENTS.

         (a)      Term of the Plan. The Plan, as set forth herein, shall become
effective on the date of its adoption by the Board of Directors, subject to the
approval of the Company's shareholders. In the event that the shareholders fail
to approve the Plan within 12 months after its adoption by the Board of
Directors, any grants of Options or sales or awards of Shares that have already
occurred shall be rescinded, and no additional grants, sales or awards shall be
made thereafter under the Plan. The Plan shall terminate automatically 10 years
after its adoption by the Board of Directors and may be terminated on any
earlier date pursuant to Subsection (b) below.

         (b)      Right to Amend or Terminate the Plan. The Board of Directors
may amend, suspend or terminate the Plan at any time and for any reason;
provided, however, that any amendment of the Plan which increases the number of
Shares available for issuance under the Plan (except as provided in Section 8),
or which materially changes the class of persons who are eligible for the grant
of ISOs, shall be subject to the approval of the Company's shareholders.
Shareholder approval shall not be required for any other amendment of the Plan.

         (c)      Effect of Amendment or Termination. No Shares shall be issued
or sold under the Plan after the termination thereof, except upon exercise of an
Option granted prior to such termination. The termination of the Plan, or any
amendment thereof, shall not affect any Share previously issued or any Option
previously granted under the Plan.

SECTION 12. DEFINITIONS.

         (a)      "Board of Directors" shall mean the Board of Directors of the
Company, as constituted from time to time.

         (b)      "Change in Control" shall mean:

                  (i)      The consummation of a merger or consolidation of the
         Company with or into another entity or any other corporate
         reorganization, if persons who were not shareholders of the Company
         immediately prior to such merger, consolidation or other reorganization
         own immediately after such merger, consolidation or other
         reorganization 50% or more of the voting power of the outstanding
         securities of each of (A) the continuing or surviving entity and (B)
         any direct or indirect parent corporation of such continuing or
         surviving entity; or

                  (ii)     The sale, transfer or other disposition of all or
         substantially all of the Company's assets.

A transaction shall not constitute a Change in Control if its sole purpose is to
change the state of the Company's incorporation or to create a holding company
that will be owned in substantially

                                        8

<PAGE>

the same proportions by the persons who held the Company's securities
immediately before such transaction.

         (c)      "Code" shall mean the Internal Revenue Code of 1986, as
amended.

         (d)      "Committee" shall mean a committee of the Board of Directors,
as described in Section 2(a).

         (e)      "Company" shall mean TradingDynamics, Inc., a California
corporation.

         (f)      "Consultant" shall mean a person who performs bona fide
services for the Company, a Parent or a Subsidiary as a consultant or advisor,
excluding Employees and Outside Directors.

         (g)      "Disability" shall mean that the Optionee is unable to engage
in any substantial gainful activity by reason of any medically determinable
physical or mental impairment.

         (h)      "Employee" shall mean any individual who is a common-law
employee of the Company, a Parent or a Subsidiary.

         (i)      "Exercise Price" shall mean the amount for which one Share may
be purchased upon exercise of an Option, as specified by the Board of Directors
in the applicable Stock Option Agreement.

         (j)      "Fair Market Value" shall mean the fair market value of a
Share, as determined by the Board of Directors in good faith. Such determination
shall be conclusive and binding on all persons.

         (k)      "ISO" shall mean an employee incentive stock option described
in Section 422(b) of the Code.

         (l)      "Nonstatutory Option" shall mean a stock option not described
in Sections 422(b) or 423(b) of the Code.

         (m)      "Option" shall mean an ISO or Nonstatutory Option granted
under the Plan and entitling the holder to purchase Shares.

         (n)      "Optionee" shall mean an individual who holds an Option.

         (o)      "Outside Director" shall mean a member of the Board of
Directors who is not an Employee.

         (p)      "Parent" shall mean any corporation (other than the Company)
in an unbroken chain of corporations ending with the Company, if each of the
corporations other than the Company owns stock possessing 50% or more of the
total combined voting power of all classes of stock in one of the other
corporations in such chain. A corporation that attains the status of a Parent on
a date after the adoption of the Plan shall be considered a Parent commencing as
of such date.

                                        9

<PAGE>

         (q)      "Plan" shall mean this TradingDynamics, Inc. 1999 Stock Plan.

         (r)      "Purchase Price" shall mean the consideration for which one
Share may be acquired under the Plan (other than upon exercise of an Option), as
specified by the Board of Directors.

         (s)      "Purchaser" shall mean an individual to whom the Board of
Directors has offered the right to acquire Shares under the Plan (other than
upon exercise of an Option).

         (t)      "Service" shall mean service as an Employee, Outside Director
or Consultant.

         (u)      "Share" shall mean one share of Stock, as adjusted in
accordance with Section 8 (if applicable).

         (v)      "Stock" shall mean the Common Stock of the Company.

         (w)      "Stock Option Agreement" shall mean the agreement between the
Company and an Optionee which contains the terms, conditions and restrictions
pertaining to the Optionee's Option.

         (x)      "Stock Purchase Agreement" shall mean the agreement between
the Company and a Purchaser who acquires Shares under the Plan which contains
the terms, conditions and restrictions pertaining to the acquisition of such
Shares.

         (y)      "Subsidiary" means any corporation (other than the Company) in
an unbroken chain of corporations beginning with the Company, if each of the
corporations other than the last corporation in the unbroken chain owns stock
possessing 50% or more of the total combined voting power of all classes of
stock in one of the other corporations in such chain. A corporation that attains
the status of a Subsidiary on a date after the adoption of the Plan shall be
considered a Subsidiary commencing as of such date.

                                       10

<PAGE>

                               FIRST AMENDMENT TO
                      TRADINGDYNAMICS, INC. 1999 STOCK PLAN
                           Amended as of April 4, 2001

I.       Purpose of the Amendment.
         ------------------------

                  On January 20, 2000, Ariba, Inc. consummated a merger among
Ariba, Inc., Blue Merger Corporation, a wholly owned subsidiary of Ariba, Inc.,
and TradingDynamics, Inc., a California corporation (the "Merger"), pursuant to
which the TradingDynamics, Inc. 1999 Stock Plan (the "Plan") was assumed by
Ariba, Inc., including all outstanding options under the Plan. As a result of
the Merger and the assumption of the Plan, Ariba, Inc. wishes to amend the Plan
in several minor respects in order to permit Ariba, Inc. to grant options under
the assumed Plan.

II.      Amendment to Plan.
         -----------------

                  As of April 4, 2001, the Plan is hereby amended as follows:

                  (a)      The first sentence of Subsection 4(a) of the Plan is
hereby amended by substituting the number "1,097,162" for the number
"2,500,000." The first sentence of Subsection 4(a) of the Plan shall henceforth
read as follows:

                           Basic Limitation. The aggregate number of Shares that
                           may be issued under the Plan (upon exercise of
                           Options or other rights to acquire Shares) shall not
                           exceed 1,097,162 Shares subject to adjustment
                           pursuant to Section 8.

                  (b)      The last sentence of Subsection 4(b) is hereby
amended by substituting the number "1,097,162" for the number "2,500,000." The
last sentence of Subsection 4(b) shall henceforth read as follows:

                           In the event that Shares issued under the Plan are
                           reacquired by the Company pursuant to any forfeiture
                           provision, right of repurchase or right of first
                           refusal, such Shares shall again be available for the
                           purposes of the Plan, except that the aggregate
                           number of Shares which may be issued upon the
                           exercise of ISOs shall in no event exceed 1,097,162
                           Shares (subject to adjustment pursuant to Section 8).

                  (c)      Subsection 12(d) of the Plan is hereby amended by
providing that the members of the Committee must meet the requirements for
administrators and outside directors acting under plans intended to qualify for
exemption under Rule 16b-3 of the Securities Exchange Act of 1934 and Section
162(m)(4)(C) of the Internal Revenue Code. Subsection 12(d) of the Plan shall
henceforth read as follows:

                           "Committee" shall mean a committee of two (2) or more
                           members of the Board of Directors appointed by the
                           Board of Directors to exercise one or more
                           administrative functions under the Plan. In addition,
                           the composition of the Committee shall satisfy:

<PAGE>

                           (i)      Such requirements as the Securities and
                           Exchange Commission may establish for administrators
                           acting under plans intended to qualify for exemption
                           under Rule 16b-3 (or its successor) under the
                           Securities Exchange Act of 1934 as amended; and

                           (ii)     Such requirements as the Internal Revenue
                           Service may establish for outside directors acting
                           under plans intending to qualify for exemption under
                           Section 162(m)(4)(C) of the Code.

                  (d)      Subsection 12(e) of the Plan is hereby amended by
substituting the word "Ariba" for the word "TradingDynamics," and by
substituting the word "Delaware" for the word "California" Subsection 12(e) of
the Plan shall henceforth read as follows:

                           "Company" shall mean Ariba, Inc., a Delaware
corporation.

III.     Effective Date.
         --------------

                  This First Amendment shall be effective upon its approval by
the Compensation Committee of the Board of Directors of Ariba, Inc.

IV.      Effect on the Plan.
         ------------------

                  Except as expressly amended hereby, the Plan shall remain
unchanged and in full force and effect and is hereby ratified and confirmed.

                                        2

<PAGE>

                               FIRST AMENDMENT TO
                            SUPPLIERMARKET.COM, INC.
                             1999 STOCK OPTION PLAN
                           Amended as of April 4, 2001

         I.       Purpose of the Amendment.
                  ------------------------

         On or about August 28, 2000, the Company consummated a merger among
Ariba, Inc. and Eli Merger Corporation, a wholly-owned subsidiary of Ariba,
Inc., and suppliermarket.com, Inc., a Delaware corporation (the "Merger"),
pursuant to which the suppliermarket.com, Inc. 1999 Stock Option Plan (the
"Plan") was assumed by Ariba, Inc., including all outstanding options under the
Plan. As a result of the Merger and the assumption of the Plan, Ariba, Inc.
wishes to amend the Plan to include Ariba, Inc. within the definition of
"Company" under the Plan in order to permit Ariba, Inc. to grant options under
the assumed Plan, and to permit alternate payment methods for the exercise of
options under the assumed Plan.

         II.      Amendment to Plan.
                  -----------------

         As of April 4, 2001, the Plan is hereby amended as follows:

                  (a)      The first sentence in the first paragraph of the Plan
is hereby amended by (i) substituting the words "Ariba, Inc." for the words
"suppliermarket.com, Inc.," (ii) changing the number "2,625,962" for the number
"2,472,690," and (iii) changing the par value to $.02. The first sentence of the
first paragraph of the Plan shall henceforth read as follows:

                  This Plan (this "Plan") of Ariba, Inc. (the "Company")
                  provides that options for up to 2,472,690 shares (the
                  "Shares") of the Company's Common Stock, $.02 par value per
                  share (the "Stock"), may be granted to employees of the
                  Company and its subsidiaries, as defined below, and to others
                  who are in a position to make significant contributions to the
                  success of the Company and its subsidiaries.

                  (b)      Section 10(a) is hereby amended by deleting the word
"or" before the Subsection "(iii)" and by adding the phrase "or (iv) by any
method provided for by the Board or Committee in its discretion that is
permitted by law." Section 10(a) shall henceforth read as follows:

                  Exercise Price. The exercise price for Shares purchased under
                  an option shall be paid as follows: (i) in cash or by
                  certified check, bank draft or money order payable to the
                  order of the Company; (ii) if permitted by the terms of the
                  instrument granting the option, by the delivery of shares of
                  Stock having a fair market value (as determined by the Board
                  in good faith in its reasonable discretion) on the date of
                  exercise equal to the exercise price; (iii) by a combination
                  of cash and

<PAGE>

                  Stock; provided, however, that payment of the exercise price
                  by delivery of shares of Common Stock of the Company owned by
                  such optionholder may be made only if such payment does not
                  result in a charge to earnings for financial accounting
                  purposes as determined by the Board, unless the Board
                  otherwise permits such payment by delivery of shares of Common
                  Stock; or (iv) by any method provided for by the Board or
                  Committee in its discretion that is permitted by law.

         III.     Effective Date.
                  --------------

         This First Amendment shall be effective upon its approval by the
Compensation Committee of the Board of Directors of Ariba, Inc.

         IV.      Effect on the Plan.
                  ------------------

         Except as expressly amended hereby, the Plan shall remain unchanged and
in full force and effect and is hereby ratified and confirmed.

                                        2

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