Document:

<PAGE>

                                                                   EXHIBIT 10.23

*    Represents confidential information for which Ariba, Inc. is seeking
     confidential treatment with the Securities and Exchange Commission.

                                   ARIBA, INC.
                                 807 11th Avenue
                               Sunnyvale, CA 94089

                                October 16, 2001

Jim Frankola
   [*]

Dear Jim:

     Ariba, Inc. (the "Company") is pleased to offer you employment on the
following terms:

     1. Position. Your initial responsibilities will consist of special projects
assigned by the Company's Chief Executive Officer. At a time mutually agreeable
to you and the Company's Chief Executive Officer, your title will be Chief
Financial Officer, and you will report to the Company's Chief Executive Officer.
By signing this letter agreement, you confirm to the Company that you have no
contractual commitments or other legal obligations that would prohibit you from
performing your duties for the Company.

     2. Cash Compensation. The Company will pay you a starting salary at the
rate of $450,000 per year, payable in accordance with the Company's standard
payroll schedule. This salary will be subject to adjustment pursuant to the
Company's employee compensation policies in effect from time to time. In
addition, you will be eligible to be considered for an incentive bonus for each
fiscal year of the Company. The bonus (if any) will be awarded based on
objective or subjective criteria established by the Company's Chief Executive
Officer and approved by the Compensation Committee of the Company's Board of
Directors (the "Committee"). Your target bonus will be equal to $150,000 per
year. Any bonus for the fiscal year in which your employment begins will be
prorated, based on the number of days you are employed by the Company during
that fiscal year. The bonus for a fiscal year will be paid after the Company's
books for that year have been closed and will be paid only if the Company
employs you at the time of payment. The determinations of the Committee with
respect to your bonus will be final and binding.

     3. Employee Benefits. As a regular employee of the Company, you will be
eligible to participate in a number of Company-sponsored benefits. These
benefits are described in the employee benefit summary that I have enclosed with
this letter agreement. In addition,

<PAGE>

JIm Frankola
October 16, 2001
Page 2

you will be entitled to paid vacation in accordance with the Company's vacation
policy, as in effect from time to time.

     4. Stock Options. Subject to the approval of the Committee, you will be
granted an option to purchase 1,500,000 shares of the Company's Common Stock.
The exercise price per share will be equal to the fair market value per share on
the date the option is granted or on your first day of employment, whichever is
later. The option will be subject to the terms and conditions applicable to
options granted under the Company's 1999 Equity Incentive Plan (the "Plan"), as
described in the Plan and the applicable Stock Option Agreement. The option will
become exercisable for 25% of the option shares after 12 months of continuous
service with the Company, and the balance will become exercisable in equal
monthly installments over the next 36 months of continuous service, as described
in the applicable Stock Option Agreement.

     5. Severance Pay. If the Company terminates your employment for any reason
other than Cause or Permanent Disability, then the Company will continue to pay
your cash compensation for a period of 12 months following the termination of
your employment (the "Continuation Period"). For this purpose, your "cash
compensation" will be deemed to be the sum of:

          (a) Your base salary at the rate in effect at the time of the
     termination of your employment; plus

          (b) The lesser of (i) the sum of your actual bonuses for the last four
     completed fiscal quarters preceding the termination of your employment or
     (ii) your target bonuses for those four completed fiscal quarters.

Your cash compensation will be paid in accordance with the Company's standard
payroll procedures.

     However, this Paragraph 5 will not apply unless you (a) sign a general
release of claims (in a form prescribed by the Company) of all known and unknown
claims that you may then have against the Company or persons affiliated with the
Company and (b) have returned all Company property. In addition, all payments
under this Paragraph 5 will be discontinued immediately if you fail to comply
with Paragraph 10, 11, 12 or 13 below.

     "Cause" means (a) an unauthorized use or disclosure of the Company's
confidential information or trade secrets, which use or disclosure causes
material harm to the Company, (b) a material breach of any agreement between you
and the Company, (c) a material failure to comply with the Company's written
policies or rules, (d) a conviction of, or plea of "guilty" or "no contest" to,
a felony under the laws of the United States or any State, (e) gross negligence
or willful misconduct or (f) a continued failure to perform assigned duties
after receiving written notification of the failure from the Company's Chief
Executive Officer. The foregoing is not an exclusive list of all acts or
omissions that the Company may consider as grounds for your termination without
Cause.

<PAGE>

Jim Frankola
October 16, 2001
Page 3

     "Permanent Disability" means that you are unable to perform the essential
functions of your position, with or without reasonable accommodation, for a
period of at least 120 consecutive days because of a physical or mental
impairment.

     6. Loan. As soon as reasonably practicable after the commencement of your
employment and after you notify the Company of your desire to receive the Loan
(as defined below), the Company will make an unsecured loan (the "Loan") to you
in the amount of $1,500,000. The Loan will also be conditioned upon the receipt
by the Company of a fully executed Promissory Note in the form attached hereto
as Exhibit A. The loan will bear interest at the Applicable Federal Rate, as
prescribed by the Internal Revenue Service for the month in which the loan is
made. Interest will be compounded annually. The principal amount of the loan and
accrued interest will be payable in full immediately after your employment with
the Company terminates for any reason other than a termination by the Company
without Cause. The principal amount of the loan and accrued interest will be
forgiven in full if the Company terminates your employment for any reason other
than Cause. In addition, one-third of the principal amount and all accrued
interest will be forgiven after 12 months of continuous service with the Company
as its Chief Financial Officer, and the balance will be forgiven in equal
monthly installments over the next 24 months of continuous service as its Chief
Financial Officer.

     You will be solely responsible for the income taxes attributable to the
forgiveness of the loan. As a condition of the forgiveness of any part of the
loan, you will be required to make arrangements satisfactory to the Company for
the payment of the payroll and withholding taxes attributable to the loan
forgiveness. If you fail to make such arrangements, the applicable part of the
loan will not be forgiven. In addition, you agree that the Company may withhold
payroll and withholding taxes attributable to loan forgiveness from any other
compensation payable to you.

     7. Proprietary Information and Inventions Agreement; Insider Trading
Policy. Like all Company employees, you will be required, as a condition of your
employment with the Company, to sign the Company's standard Proprietary
Information and Inventions Agreement, a copy of which is enclosed. You also
agree to comply in every respect with the Company's insider trading policy, a
copy of which is enclosed.

     8. Employment Relationship. Employment with the Company is for no specific
period of time. Your employment with the Company will be "at will," meaning that
either you or the Company may terminate your employment at any time and for any
reason, with or without cause. Any contrary representations that may have been
made to you are superseded by this offer. This is the full and complete
agreement between you and the Company on this term. Although your job duties,
title, compensation and benefits, as well as the Company's personnel policies
and procedures, may change from time to time, the "at will" nature of your
employment may only be changed in an express written agreement signed by you and
the Chief Executive Officer of the Company.

<PAGE>

Jim Frankola
October 16, 2001
Page 4

     9. Outside Activities. While you render services to the Company, you agree
that you will not engage in any other employment, consulting or other business
activity without the prior written consent of the Company. While you render
services to the Company, you also will not assist any person or entity in
competing with the Company, in preparing to compete with the Company or in
hiring any employees or consultants of the Company.

     10. Non-Solicitation. While you render services to the Company and during
the Continuation Period (if any), you agree that you will not directly or
indirectly, personally or through others, solicit or attempt to solicit the
employment of any employee of the Company or any of the Company's affiliates,
whether on your own behalf or on behalf of any other person or entity. The term
"employment" for purposes of this Paragraph 10 means to enter into an
arrangement for services as a full-time or part-time employee, independent
contractor, agent or otherwise. You and the Company agree that this provision is
reasonably enforced as to any geographic area in which the Company conducts its
business.

     11. Non-Competition. While you render services to the Company and during
the Continuation Period (if any), you agree that you will not:

          (a) Directly or indirectly, individually or in conjunction with
     others, engage in activities that compete with the Company or work for any
     entity that is part of the Company's Market;

          (b) Solicit, serve, contract with or otherwise engage any existing or
     prospective customer, client or account of the Company on behalf of any
     entity that is part of the Company's Market; or

          (c) Cause or attempt to cause any existing or prospective customer,
     client or account of the Company to divert from, terminate, limit or in any
     manner modify, or fail to enter into, any actual or potential business
     relationship with the Company.

You and the Company agree that this provision is reasonably enforced with
reference to any geographic area in which the Company maintains any such
relationship. For purposes of this Paragraph 11, the Company's "Market" means
(i) all companies that derive their revenue primarily from e-procurement
software sales or sales of software or services aiding companies in sourcing
activities; and (ii) those companies set forth on Exhibit B hereto. You and the
Company agree that the Company's Market is global in scope.

     12. Cooperation and Non-Disparagement. You agree that, during the
Continuation Period, you will cooperate with the Company in every reasonable
respect and will use your best efforts to assist the Company with the transition
of your duties to your successor. You further agree that, during the
Continuation Period, you will not in any way or by any means disparage the
Company, the members of the Company's Board of Directors or the Company's
officers and employees.

<PAGE>

Jim Frankola
October 16, 2001
Page 5

     13. Disclosure. You agree that, during the Continuation Period, you will
inform any new employer or other person or entity with whom you enter into a
business relationship, before accepting employment or entering into a business
relationship, of the existence of Paragraphs 10, 11 and 12 above.

     14. Withholding Taxes. All forms of compensation referred to in this letter
agreement are subject to reduction to reflect applicable withholding and payroll
taxes and other deductions required by law.

     15. Entire Agreement. This letter agreement supersedes and replaces any
prior agreements, representations or understandings, whether written, oral or
implied, between you and the Company.

     16. Severability. If any provision of this letter agreement becomes or is
deemed invalid, illegal or unenforceable in any applicable jurisdiction by
reason of the scope, extent or duration of its coverage, then that provision
will be deemed amended to the minimum extent necessary to conform to applicable
law so as to be valid and enforceable or, if the provision cannot be so amended
without materially altering the intention of the parties, then the provision
will be stricken and the remainder of this letter agreement will continue in
full force and effect. If any provision of this letter agreement is rendered
illegal by any present or future statute, law, ordinance or regulation
(collectively, the "Law"), then that provision will be curtailed or limited only
to the minimum extent necessary to bring the provision into compliance with the
Law. All the other terms and provisions of this letter agreement will continue
in full force and effect without impairment or limitation.

     17. Arbitration. You and the Company agree to waive any rights to a trial
before a judge or jury and agree to arbitrate before a neutral arbitrator any
and all claims or disputes arising out of this letter agreement and any and all
claims arising from or relating to your employment with the Company, including
(but not limited to) claims against any current or former employee, director or
agent of the Company, claims of wrongful termination, retaliation,
discrimination, harassment, breach of contract, breach of the covenant of good
faith and fair dealing, defamation, invasion of privacy, fraud,
misrepresentation, constructive discharge or failure to provide a leave of
absence, or claims regarding commissions, stock options or bonuses, infliction
of emotional distress or unfair business practices.

     The arbitrator's decision must be written and must include the findings of
fact and law that support the decision. The arbitrator's decision will be final
and binding on both parties, except to the extent applicable law allows for
judicial review of arbitration awards. The arbitrator may award any remedies
that would otherwise be available to the parties if they were to bring the
dispute in court. The arbitration will be conducted in accordance with the
National Rules for the Resolution of Employment Disputes of the American
Arbitration Association; provided, however that the arbitrator must allow the
discovery authorized by the California Arbitration Act or the discovery that the
arbitrator deems necessary for the parties to vindicate

<PAGE>

Jim Frankola
October 16, 2001
Page 6

their respective claims or defenses. The arbitration will take place in Santa
Clara County or, at your option, the county in which you primarily worked with
the Company at the time when the arbitrable dispute or claim first arose.

     You and the Company will share the costs of arbitration equally, except
that the Company will bear the cost of the arbitrator's fee and any other type
of expense or cost that you would not be required to bear if you were to bring
the dispute or claim in court. Both the Company and you will be responsible for
their own attorneys' fees, and the arbitrator may not award attorneys' fees
unless a statute or contract at issue specifically authorizes such an award.

     This arbitration provision does not apply to (a) workers' compensation or
unemployment insurance claims or (b) claims concerning the validity,
infringement or enforceability of any trade secret, patent right, copyright or
any other trade secret or intellectual property held or sought by either you or
the Company (whether or not arising under the Proprietary Information and
Inventions Agreement between you and the Company).

     If an arbitrator or court of competent jurisdiction (the "Neutral")
determines that any provision of this arbitration provision is illegal or
unenforceable, then the Neutral shall modify or replace the language of this
arbitration provision with a valid and enforceable provision, but only to the
minimum extent necessary to render this arbitration provision legal and
enforceable.

                                    * * * * *

     We hope that you will accept our offer to join the Company. You may
indicate your agreement with these terms and accept this offer by signing and
dating both the enclosed duplicate original of this letter agreement and the
enclosed Proprietary Information and Inventions Agreement and returning them to
me. This offer, if not accepted, will expire at the close of business on October
16, 2001. As required by law, your employment with the Company is contingent
upon your providing legal proof of your identity and authorization to work in
the United States. Your employment is also contingent upon your starting work
with the Company on or before October 16, 2001.

     If you have any questions, please call me at [*].

                                       Very truly yours,

                                       ARIBA, INC.

                                       By:   /s/ Craig M. Schmitz
                                            ------------------------------------
                                       Title:   Vice President of Corporate
                                                Development and General Counsel
                                               --------------------------------

<PAGE>

Jim Frankola
October 16, 2001
Page 7

I have read and accept this employment offer:

/s/ James W. Frankola
---------------------------------------------
              Signature of [Name]

Dated:    October 16, 2001
       --------------------------------------

Enclosures

<PAGE>

Jim Frankola
October 16, 2001
Page 8

                                    Exhibit A
                                    ---------

                             Form of Promissory Note

<PAGE>

                                 PROMISSORY NOTE

$1,500,000.00                                                    January 1, 2002
                                                           Sunnyvale, California

     FOR VALUE RECEIVED, the undersigned Borrower promises to pay to Ariba, Inc.
(the "Company") at its principal executive offices the principal sum of one
million five hundred thousand dollars ($1,500,000), together with interest from
the date of this Note on the unpaid principal balance, upon the terms and
conditions specified below.

     1. Term. The principal balance of this Note, together with all interest
accrued and unpaid to date, shall be due and payable in full at the close of
business on the date when the Borrower's employment with the Company terminates
for any reason other than a termination by the Company without Cause.

     "Cause" means (a) an unauthorized use or disclosure of the Company's
confidential information or trade secrets, which use or disclosure causes
material harm to the Company, (b) a material breach of any agreement between the
Borrower and the Company, (c) a material failure to comply with the Company's
written policies or rules, (d) a conviction of, or plea of "guilty" or "no
contest" to, a felony under the laws of the United States or any State, (e)
gross negligence or willful misconduct or (f) a continued failure to perform
assigned duties after receiving written notification of the failure from the
Company's Chief Executive Officer. The foregoing is not an exclusive list of all
acts or omissions that the Company may consider as grounds for the Borrower's
termination without Cause.

     2. Rate of Interest. Interest shall accrue under this Note on any unpaid
principal balance at the rate of 2.73% per annum, compounded annually.

     3. Prepayment. Prepayment of principal and interest may be made at any
time, without penalty.

     4. Events of Acceleration. The entire unpaid principal sum and accrued
interest under this Note shall become immediately due and payable upon:

          (a) The failure of the Borrower to pay when due the principal balance
     and accrued interest under this Note;

          (b) The filing of a petition by or against the Borrower under any
     provision of the Bankruptcy Reform Act (Title 11 of the United States
     Code), as amended or recodified from time to time, or under any other law
     relating to bankruptcy, insolvency, reorganization or other relief for
     debtors;

          (c) The appointment of a receiver, trustee, custodian or liquidator of
     or for any part of the assets or property of the Borrower;

<PAGE>

          (d) The execution by the Borrower of a general assignment for the
     benefit of creditors;

          (e) The insolvency of the Borrower or the Borrower's failure to pay
     his or her debts as they become due; or

          (f) Any attachment or like levy on any property of the Borrower.

     5. Forgiveness. The principal amount of this Note and accrued interest
shall be forgiven in full if (a) the Company terminates the Borrower's
employment for any reason other than Cause or (b) the Borrower's employment with
the Company terminates because of his death. In addition, one-third of the
principal amount of this Note and all accrued interest shall be forgiven after
the Borrower completes 12 months of continuous service with the Company as its
Chief Financial Officer, and the balance shall be forgiven in equal monthly
installments over the Borrower's next 24 months of continuous service with the
Company as its Chief Financial Officer. The Borrower shall be solely responsible
for the income taxes attributable to the forgiveness of this Note. As a
condition of the forgiveness of any part of this Note, the Borrower shall make
arrangements satisfactory to the Company for the payment of the payroll and
withholding taxes attributable to the forgiveness of such part. If the Borrower
fails to make such arrangements, the applicable part of this Note shall not be
forgiven. In addition, the Borrower agrees that the Company may withhold payroll
and withholding taxes attributable to loan forgiveness from any other
compensation payable to him.

     6. Full Recourse. This Note shall be unsecured. The Borrower shall be
personally liable for the payment in full of any indebtedness owing under this
Note. The Company shall have recourse to any and all assets of the Borrower to
satisfy the Borrower's obligations hereunder.

     7. Collection and Attorneys' Fees. If any action is instituted to collect
this Note, the Borrower promises to pay all reasonable costs and expenses
(including reasonable attorneys' fees) incurred by the Company in connection
with such action.

     8. Waiver. No previous waiver and no failure or delay by the Company or the
Borrower in acting with respect to the terms of this Note shall constitute a
waiver of any breach, default or failure of condition under this Note or the
obligations evidenced thereby. A waiver of any term of this Note or of any of
the obligations evidenced thereby must be made in writing and signed by a duly
authorized officer of the Company and shall be limited to the express terms of
such waiver. The Borrower hereby expressly waives presentment and demand for
payment when any payments are due under this Note.

     9. Conflicting Agreements. In the event of any inconsistencies between the
terms of this Note and the terms of any other document related to the loan
evidenced by this Note, the terms of this Note shall prevail.

                                       2

<PAGE>

     10. Governing Law. This Note shall be construed in accordance with the laws
of the State of California (without regard to their choice-of-law provisions).

-------------------------------        -----------------------------------------
Name of Borrower                            Signature of Borrower

                                       Address:
                                                --------------------------------

                                                --------------------------------

                                       3

<PAGE>

                                    Exhibit B
                                    ---------

[*]<PAGE>

                                                                   EXHIBIT 10.24

*    Represents confidential information for which Ariba, Inc. is seeking
     confidential treatment with the Securities and Exchange Commission.

                               AMENDMENT NO. 1 TO
                            STOCK PURCHASE AGREEMENT

     THIS AMENDMENT NO. 1 TO STOCK PURCHASE AGREEMENT ("Amendment") is made as
of December 10, 2001, by and among Nihon Ariba K.K., a Japanese corporation (the
"Company"), SOFTBANK Corp., a Japanese corporation ("SOFTBANK Parent") and
SOFTBANK EC Holdings Corp., a Japanese corporation previously known as SOFTBANK
E-Commerce Corp. and a direct wholly owned subsidiary of SOFTBANK Parent
("SOFTBANK" and together with SOFTBANK Parent, the "Investors").

                                 R E C I T A L S
                                 ---------------

     WHEREAS, the Company and the Investors entered into that certain Stock
Purchase Agreement, dated as of October 19, 2000 (the "Stock Purchase
Agreement"); and

     WHEREAS, concurrently herewith, the Investors and certain other parties are
amending and/or entering into other agreements relating to the business and
affairs of the Company, and the parties hereto now wish to amend the Stock
Purchase Agreement as set forth in this Amendment.

     NOW, THEREFORE, in consideration of the promises and conditions contained
herein, the parties hereby agree to amend the Stock Purchase Agreement as
follows:

     1. Sections 7.1 and 7.2 of the Stock Purchase Agreement be, and they hereby
are, deleted in their entirety.

     2. Section 8.2 of the Stock Purchase Agreement be, and it hereby is,
amended and restated in its entirety to read in full as follows:

          "8.2 Termination. This Agreement may be terminated as follows:

               (a)  Upon the parties' mutual written agreement.

               (b)  If any of the Company, Ariba or either Investor fails to
                    perform, in any material respect, any of its material
                    obligations hereunder or under any of the other Transaction
                    Agreements, and if such default continues for a period of
                    thirty (30) days after the date the defaulting party first
                    receives written notice of such default from either Investor
                    (if Ariba or the Company is the defaulting party) or Ariba
                    or the Company (if either of the Investors is the defaulting
                    party), then either Investor (if Ariba or the Company is the
                    defaulting party) or the Company (if either of the Investors
                    is the defaulting party) shall have the right to terminate
                    this Agreement effective immediately upon written notice to
                    the defaulting party at any time after such thirty (30)-day
                    period.

<PAGE>

               (c)  Notwithstanding the foregoing, the right of the Investors to
                    terminate this Agreement pursuant to Section 8.2(b), as a
                    result of a default of the Company, shall exist only if [*]
                    and only if [*] (as defined in the Shareholders Agreement)
                    is in effect.

               (d)  Any of the Company or the Investors shall have the right to
                    terminate this Agreement, effective immediately upon written
                    notice to the other party, in the event that the Company
                    (where an Investor is the party giving notice) or an
                    Investor (where the Company is the party giving notice) is
                    dissolved, liquidated or declared bankrupt or a filing for
                    voluntary or involuntary bankruptcy, civil rehabilitation or
                    for the application of other similar insolvency or
                    rehabilitation procedures is made by such party.

               (e)  Notwithstanding the foregoing, Section 7.3 and Article 9
                    (except for Section 9.6, which shall not survive
                    termination) shall survive a termination of the Agreement.
                    Termination of this Agreement for any reason shall not
                    release any party from any liability or obligation which has
                    already accrued as of the effective date of such
                    termination, and shall not constitute a waiver or release
                    of, or otherwise be deemed to prejudice or adversely affect,
                    any rights, remedies or claims, whether for damages or
                    otherwise, which a party may have hereunder, at law, equity
                    or otherwise or which may arise out of or in connection with
                    such termination.

               (f)  For purposes of this Section 8.2, the term "Transaction
                    Agreements" shall include this Agreement, the Shareholders
                    Agreement and the amended and restated letter agreement
                    dated December 10, 2001 between SOFTBANK Parent and Ariba."

     3. Section 9.1 of the Stock Purchase Agreement be, and it hereby is,
amended and restated in its entirety to read in full as follows:

          "9.1 Governing Law; Dispute Resolution. The validity, construction and
     enforceability of this Agreement and all related agreements, collectively
     or separately, shall be governed by and construed in accordance with the
     laws of the State of California. The parties shall attempt to resolve all
     disputes between the parties arising out of or relating to this Agreement
     amicably through good faith discussions upon the written request of any
     party. In the event that any such dispute cannot be resolved thereby within
     a period of sixty (60) days after such notice has been given (the last day
     of such sixty (60) day period being herein referred to as the "Arbitration
     Date"), such dispute shall be finally settled by arbitration in San
     Francisco, California, using the English language in accordance with the
     Arbitration Rules and Procedures of JAMS then in effect, by one or more
     commercial arbitrator(s) with substantial experience in resolving complex
     commercial contract disputes, who may or may not be selected from the
     appropriate list of JAMS arbitrators. If the parties cannot agree upon the
     number and identity of the arbitrators within fifteen (15) days following
     the Arbitration Date, then a single arbitrator shall be selected on an
     expedited basis in accordance with the Arbitration Rules and Procedures of
     JAMS, provided that any arbitrator so selected shall have substantial
     experience in the software industry. The arbitrator(s) shall have the
     authority to grant specific performance and to allocate between the parties
     the costs of arbitration (including service fees, arbitrator fees and all
     other fees related to the arbitration) in such equitable manner as the
     arbitrator(s) may determine. The prevailing party in the arbitration shall
     be entitled to receive reimbursement of its reasonable

                                       2

<PAGE>

     expenses (including reasonable attorneys' fees, expert witness fees and all
     other expenses) incurred in connection therewith. Judgment upon the award
     so rendered may be entered in a court having jurisdiction or application
     may be made to such court for judicial acceptance of any award and an order
     of enforcement, as the case may be. Notwithstanding the foregoing, each
     party shall have the right to institute an action in a court of proper
     jurisdiction for preliminary injunctive relief pending a final decision by
     the arbitrator(s), provided that a permanent injunction and damages shall
     only be awarded by the arbitrator(s). For all purposes of this Section 9.1,
     the parties consent to exclusive jurisdiction and venue in the United
     States federal Courts located in the Northern District of California. For
     the avoidance of doubt, the validity, construction, and enforceability of
     this Agreement and the resolution of disputes arising out of and relating
     to this Agreement and any related agreements (other than an action solely
     between Nihon Ariba K.K. and Softbank Commerce Corporation relating solely
     to the Amended Master Alliance Agreement), collectively or separately,
     shall be governed solely by this Section 9.1, notwithstanding that (i) the
     Amended Master Alliance Agreement is governed by Japanese law and uses a
     different dispute resolution procedure or (ii) disputes arising out of or
     relating to this Agreement are, or are asserted to, in any way relate to or
     be based on similar facts as disputes arising out of or relating to the
     Amended Master Alliance Agreement."

     4. Section 9.2(c) of the Stock Purchase Agreement be, and it hereby is,
amended and restated in its entirety to read in full as follows:

          " (b) If to SOFTBANK

                [*]

                with a copy to:

                [*]

            (c) If to the Company [*]

                with a copy to:

                [*]"

     5. Miscellaneous.

     5.1 Successors and Assigns. Except as otherwise provided herein, the terms
and conditions of this Amendment shall inure to the benefit of and be binding
upon the respective permitted successors and assigns of the parties.

     5.2 Counterparts. This Amendment may be executed in two or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

                                       3

<PAGE>

     5.3 Amendments and Waivers. Any term of this Amendment may be amended only
with the written consent of the parties. Except as explicitly stated in this
Amendment, all terms, conditions and provisions of the Stock Purchase Agreement
remain unchanged by this Amendment and shall continue in full force and effect.

(Signatures on following page.)

                                       4

<PAGE>

     IN WITNESS WHEREOF, the parties have executed this Amendment as of the date
first above written.

                                       COMPANY:

                                       NIHON ARIBA K.K.

                                       By:   /s/ Kuniaki Watanabe
                                           -------------------------------------
                                       Title:   President and CEO
                                              ----------------------------------

                                       INVESTORS:

                                       SOFTBANK EC HOLDINGS CORP.

                                       By:  /s/ Ken Miyauchi
                                           -------------------------------------
                                       Title:  President and CEO
                                              ----------------------------------

                                       SOFTBANK CORP.

                                       By:   /s/ Masayoshi Son
                                           -------------------------------------
                                       Title:   President and CEO
                                              ----------------------------------

                      SIGNATURE PAGE TO AMENDMENT NO.1 TO
                            STOCK PURCHASE AGREEMENT

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