Document:

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                                                                   EXHIBIT 10.24

                                   December 8, 1999

Mr. Michael R. Manley
73 Kingsbury Road
New Rochelle, New York 10804

               Re:  Severance

Dear Michael:

     This letter will confirm our agreement (the "Agreement") as follows:

     1.  In the event that there is a change in control of the PartMiner, Inc.
(the "Company") and your employment with the Company is terminated by the
Company within one (1) year following a change in control for reasons other than
cause or your death or disability, the Company shall make salary continuation
payments to you equal to six (6) months of your salary at the annual rate of
$200,000, and the Company shall reimburse you for business expenses that had
been accrued but had not been paid prior to the date of termination. The Company
shall have no further obligation to make any payments to you or provide any
benefits to you after the date of such termination.

     2.  For purposes of this Agreement:

         (a) a "change in control" shall mean a change in the management of the
Company so that Daniel Nissanoff is no longer the President and Chief Executive
Officer of the Company, a merger or consolidation in which the Company is not
the surviving entity, or a sale of fifty percent (50%) or more of the assets or
capital stock of the Company; and

         (b) "cause" shall mean knowingly or recklessly causing material injury
to the Company; willful misconduct in the performance of, or a willful failure
to perform, your duties; commission of dishonest or fraudulent conduct whether
or not in connection with your employment, or unlawful behavior involving moral
turpitude whether or not in connection with your employment.

     3.  This Agreement is not an employment agreement. Nothing in this
Agreement shall be interpreted or construed to confer upon you any right with
respect to employment with the Company now or in the future, nor shall this
Agreement interfere in any way with the right of the Company to terminate your
employment at any time.
<PAGE>

Michael R. Manley                      2                      December 7, 1999

     4.  This Agreement is a personal contract, and except as specifically
set forth herein, your rights, obligations and interests herein may not be sold,
transferred or assigned. The Company may freely assign this Agreement and any of
its rights, obligations and interests hereunder. This Agreement shall be binding
upon and inure to the benefit of each party's legal beneficiaries, successors
and permitted assigns.

     5.  This Agreement contains the entire agreement between the parties with
respect to your employment by the Company, and the validity, interpretation,
construction and performance of this Agreement shall be governed by the laws of
the State of New York. This Agreement may not be changed orally, but only by
agreement in writing signed by the party against whom enforcement of any waiver,
change, modification or discharge is sought. Section and paragraph headings are
for convenience of reference only and shall not be considered a part of this
Agreement.

     6.  Any notices or other communications required or permitted hereunder
shall be in writing and shall be deemed given (a) on the same day if given by
hand, (b) on the third business day after mailing if given by registered or
certified mail, return receipt requested, postage prepaid, (c) on the next
business day after it was deposited with a courier service if sent by reputable
overnight courier, or (d) when sent if given by facsimile with confirmation,
addressed to you at the address first set forth above or to the Company at its
offices at 432 Park Avenue South, New York, New York 10016, Attention: General
Counsel (fax no. 212-592-5833), with a copy to: Gould & Wilkie LLP, One Chase
Manhattan Plaza, 58th floor, New York, New York 10005, Attention: John E. Gould,
Esq. (fax no.: 212-809-6890) or such other address as shall have been specified
in writing by either party to the other.

     7.  The Company shall have the right to make all appropriate withholdings
from any payments made to you pursuant to paragraph 1 above under federal, state
and local tax laws.

     If the foregoing accurately reflects the agreement between us, please
confirm your acceptance and agreement by signing the attached copy of this
Agreement and returning the same to me.

                                      Very truly yours,

                                      PARTMINER, INC.

                                          /s/ Daniel Nissanoff
                                      By:______________________
                                         Daniel Nissanoff
                                         President and Chief Executive Officer

AGREED AND ACCEPTED:

/s/ Michael R. Manley
________________________
Michael R. Manley<PAGE>

                                                                   EXHIBIT 10.25

                             EMPLOYMENT AGREEMENT
                             --------------------

     This Employment Agreement is entered into as of March 16, 1999, by and
between Dast Corporation, d.b.a. Microcom Technologies, a New York corporation
(the "Company") and Daniel Nissanoff (the "Executive").
      -------                              ---------

                                 Introduction
                                 ------------

     The Company desires to retain the services of the Executive and the
Executive wishes to continue to be employed by the Company. The Executive is a
key employee of the Company, and has had full access to information concerning
the Company and its business. The disclosure of such information or the engaging
in competitive activities would cause substantial harm to the Company. In
addition, the Company, the Executive and certain investors in the Company have
entered into a Stock Purchase Agreement dated March 16, 1999 (the "Purchase
                                                                   --------
Agreement"), and it is a condition of the closing under the Purchase Agreement
---------
that the parties hereto enter into this Agreement.

     NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties agree as follows:

     Section 1. Term.  The Company shall employ the Executive for a term
     ---------  ----
commencing on the date of this Agreement and continuing for five (5) years,
unless earlier terminated pursuant to Section 8. The Executive's employment
under this Agreement may also be extended beyond such term with the prior
written agreement of the Executive and the Company.

     Section 2. Duties.  The Executive shall serve as President and Chief
     ---------  ------
Executive Officer of the Company for the term of this Agreement. The Executive
shall be responsible for the management of the operations of the Company,
subject to the supervision and direction of the Board of Directors of the
Company (the "Board"). The Executive shall report directly to the Board.
              -----

     Section 3.  Time Commitment; Efforts. During the term of this Agreement,
     ---------   ------------------------
the Executive shall use all reasonable efforts to promote the interests of the
Company and shall devote the Executive's full business time to its business and
affairs. The Executive may serve from time to time as an advisor, director or
trustee of outside organizations (e.g., for-profit organizations, not-for-profit
organizations, professional organizations), provided that such service does not
conflict with (i) the business or reputation of the Company, (ii) the
Executive's performance of his duties as President and Chief Executive
<PAGE>

Officer of the Company, or (iii) Sections 5 and 6 hereof. The Executive shall
consult with, and obtain the consent of, the Board with respect to his service
as an advisor, director or trustee of any outside organization. The Board shall
have sole discretion, to be exercised reasonably, in determining whether or not
the Executive's service as an advisor, director or trustee of an outside
organization conflicts with (i) the business or reputation of the Company, (ii)
the Executive's performance of his duties as President and Chief Executive
Officer of the Company, or (iii) Sections 5 and 6 hereof.

     Section 4. Compensation. The Executive shall be entitled to compensation as
     ---------  ------------
follows:

          (a)    Base Salary. During the term of the Executive's employment with
                 -----------
the Company, the Executive will receive a salary at the annual rate of $300,000
(the "Base Salary"), such salary shall be payable in appropriate installments to
      -----------
conform with the regular payroll duties for salaried personnel of the Company.

          (b)    Withholding. The Company may withhold from compensation and
                 -----------
benefits payable to the Executive all applicable federal, state and local
withholding taxes.

          (c)    Other Entitlements. The Executive shall be entitled during the
                 ------------------
term of employment to:

          (i)    participate in such benefit plans as are afforded from time to
time to other executive employees of the Company, including without limitation
all health and other insurance plans;

          (ii)   four weeks vacation during each calendar year commencing with
1999. The Executive shall be compensated for any vacation not so used;

          (iii)  reimbursement of all reasonable expenses incurred by the
Executive in the performance of his duties as President and Chief Executive
Officer of the Company, and which are documented in accordance with procedures
approved by the Company for all executive officers of the Company;

          (iv)   $2,000 per month to be used to pay for, in his sole discretion,
a leased or purchased automobile, including automobile insurance and parking
related thereto, health club expenses, life insurance, club dues and expenses,
or other similar fringe benefits; and

          (v)    life insurance benefits no less favorable to him than those
provided by the Company on the date of this Agreement.

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<PAGE>

     Section 5. Confidentiality. In consideration of the mutual promises
     ---------  ---------------
contained herein, and to preserve the goodwill of the Company (which term, for
purposes of this Section, shall include subsidiaries and affiliates of the
Company) in connection with the transactions contemplated by the Purchase
Agreement, which were of substantial benefit to the Executive, the Executive
agrees as follows:

          (a)  The Executive will not during or after the term of employment,
directly or indirectly, disclose or divulge any trade secrets or other
information of a business, financial, marketing, technical or other nature
pertaining to the Company, including information of others that the Company has
agreed to keep confidential (collectively, "Confidential Information"), except
                                            ------------------------
(i) to the extent necessary for the performance of the Executive's duties for
the Company, (ii) to the extent that such Confidential Information has become
public knowledge other than by breach of this Agreement by the Executive, or
(iii) as necessary to file tax returns or other required reports with
governmental agencies or as otherwise required by law.

          (b)  The Executive shall make no use whatsoever, directly or
indirectly, of any Confidential Information, except as required in connection
with the performance of the Executive's duties for the Company.

          (c)  Upon the termination of his employment with the Company for any
reason, the Executive shall immediately deliver to the Company all materials
(including all copies) in the Executive's possession which contain or relate to
Confidential Information.

          (d)  All inventions, ideas, sketches, designs, prototypes,
developments or improvements made by the Executive, either alone or in
conjunction with others, at any time or at any place during the term of the
Executive's employment by the Company, whether or not reduced to writing or
practice during such term, which relate to the business in which the Company is
engaged, shall be the exclusive property of the Company. The Executive shall
promptly disclose any such invention, development or improvement to the Company,
and, at the request and expense of the Company, shall assign all of the
Executive's rights to the same to the Company. The Executive shall sign all
instruments necessary for the filing and prosecution of any applications for or
extension or renewals of letters patent of the United States or any foreign
country which the Company desires to file.

          (e)  All copyrightable work by the Executive relating to the Company's
business during the term of the Executive's employment by the Company is
intended to be "work made for hire" as defined in Section 101 of the Copyright
Act of 1976, and shall be the property of the Company. If the copyright to any
such

                                       3
<PAGE>

copyrightable work is not the property of the Company by operation of law, the
Executive will, without further consideration, assign to the Company all right,
title and interest in such copyrightable work and will assist the Company and
its nominees in every way, at the Company's expense, to secure, maintain and
defend for the Company's benefit copyrights and any extensions and renewals
thereof on any and all countries, such work to be and to remain the property of
the Company whether copyrighted or not.

     Section 6. Noncompetition. In consideration of the mutual promises
     ---------  --------------
contained herein, and to preserve the goodwill of the Company (which term, for
purposes of this Section, shall include subsidiaries and affiliates of the
Company) in connection with the transactions contemplated by the Purchase
Agreement, which were of substantial benefit to the Executive, the Executive
agrees that prior to the termination of the Executive's employment with the
Company, and thereafter for a period of three (3) years:

     (i)    the Executive will not, directly or indirectly, or as a stockholder,
partner, employee, consultant or other owner or participant in any business
entity other than the Company or as a holder of not more than one (1%) percent
of the total outstanding stock of a publicly held company, engage in or assist
any other person or entity to engage in any business in which the Company is
engaging or in which the Company is actively planning to engage in at the time
of the Executive's termination;

     (ii)    the Executive will not, directly or indirectly, solicit or endeavor
to entice away from the Company, or otherwise interfere with the business
relationship of the Company with, any person who is, or was during the
Executive's term of employment, a customer or employee of, consultant or
supplier to, or other person or entity having material business relations with,
the Company; and

     (iii)   Notwithstanding the foregoing, nothing contained herein shall
prohibit the Executive from continuing his relationship with Market Maker
Systems Corporation, so long as such relationship does not otherwise violate the
terms of this Section 6.

     Section 7. Remedies. Without limiting the remedies available to the
     ---------  --------
Company, the Executive acknowledges that a breach of any of the covenants
contained in Sections 5 and 6 herein could result in irreparable injury to the
Company for which there might be no adequate remedy at law, and that, in the
event of such a breach or threat thereof, the Company shall be entitled to
obtain a temporary restraining order and/or a preliminary injunction and a
permanent injunction restraining the

                                       4

<PAGE>

Executive from engaging in any activities prohibited by Sections 5 and 6 herein
or such other equitable relief as may be required to enforce specifically any of
the covenants of Sections 5 and 6 herein.

     Section 8. Termination.  The Executive's employment with the Company (which
     ---------  -----------
term, for purposes of this Section, shall include subsidiaries and affiliates of
the Company) may be terminated at any time (i) by the Company with Cause or
without Cause or in the event of the death or Disability of the Executive or
(ii) by the Executive for Good Reason.

          As used herein, "Cause" means the good faith determination of the
                           -----
Board, after notice to the Executive and after the Executive has had an
opportunity to present the Executive's view of the relevant facts and
circumstances to the Board, that the Executive has (a) engaged in malfeasance,
willful misconduct, active fraud or gross negligence with respect to the Company
which has not been cured by the Executive within 30 days after notice to the
Executive by the Company, or (b) been convicted of or pleaded nolo contendere to
(i) any misdemeanor relating to the affairs of the Company, which is injurious
to the Company, or (ii) any felony.

          As used herein, "Disability" means the Executive is unable to render
                           ----------
the services to be rendered by him pursuant to this Agreement for a continuous
period of ninety (90) successive days or for shorter periods aggregating one
hundred twenty (120) days or more during any twelve (12) successive months. In
the event of any disagreement between the Executive and the Company as to
whether the Executive is physically or mentally incapacitated so as to permit
the Company to terminate the Executive's employment pursuant to this Section 8,
the question of such incapacity shall be submitted for decision to an impartial
and reputable physician in New York County, New York (the "Deciding Doctor")
chosen by mutual agreement of the Company and you, or, failing such agreement,
the Deciding Doctor shall be chosen by two physicians from New York County, New
York (one of whom shall be selected by the Company and the other by you). The
decision of the Deciding Doctor regarding your capacity or incapacity shall be
final and binding on the Company and you.

          As used herein, "Good Reason" means (i) the assignment to the
Executive of duties substantially inconsistent with his status as the Chief
Executive Officer of the Company, or a substantial alteration in the nature or
status of his responsibilities from those in effect as of the date hereof or as
the same may be enhanced from time to time; or (ii) a reduction by the Company
in the Executive's total compensation as in effect on the date hereof or as the
same may be increased from time to time; provided, that under either (i) or (ii)
such reason has not

                                       5
<PAGE>

been cured by the Company within 30 days after written notice to the Company by
the Executive.

          If the Executive's employment is terminated hereunder, the Company
shall have no further obligation to make any payments or provide any benefits to
the Executive hereunder after the date of termination except for (a) payments of
Base Salary and expense reimbursement that had accrued but had not been paid
prior to the date of termination, (b) if Executive's employment with the Company
is terminated by the Company without Cause (other than upon death or
Disability), continuation of Base Salary at the rate in effect at the date of
termination and continuation of benefits (to the extent permitted by the
applicable plans) until two years after the date of termination (but in no event
after the scheduled termination date of this Agreement) and (c) payments in
accordance with the next paragraph of this Section 8.

          In the event the Executive's employment by the Company is terminated
(a) by the Company without Cause (other than upon death or Disability), (b) as a
result of the Company refusing to renew or extend this Employment Agreement at
the end of any applicable term or (c) by the Executive for Good Reason, the
Executive shall have the right, by giving written notice to the Company within
ten (10) days after the date of termination of his employment by the Company, to
require the Company to repurchase at fair market value (as determined in
accordance with Schedule A to this Agreement) one hundred percent (100%) of the
                ----------
shares of capital stock of the Company held by the Executive in accordance with
the terms set forth in Schedule A.
                       ----------

          The provisions of Sections 5, 6, 7 and 8 shall survive the termination
of the Executive's employment in accordance with their terms except that the
provisions of the previous paragraph contained in this Section 8 shall become
null and void upon the Company's completion of a "Qualified Public Offering" as
                                                  -------------------------
such term is defined in Section 7.01 of the Stockholders Agreement dated as of
March 16, 1999 by and among the Company, the Executive and certain other
stockholders of the Company.

     Section 9. Enforceability, etc. This Agreement shall be interpreted in such
     ---------  -------------------
a manner as to be effective and valid under applicable law, but if any provision
hereof shall be prohibited or invalid under any such law, such provision shall
be ineffective to the extent of such prohibition or invalidity, without
invalidating or nullifying the remainder of such provision or any other
provisions of this Agreement. If any one or more of the provisions contained in
this Agreement shall for any reason be held to be excessively broad as to
duration, geographical scope, activity or subject, such provisions shall be
construed by limiting and reducing it so as to be enforceable to the maximum
extent permitted by applicable law.

                                       6
<PAGE>

     Section 10. Notices. Any notice or other communication given pursuant to
     ----------  -------
this Agreement shall be in writing and shall be deemed to be properly given when
personally delivered, on the day after if sent by nationally recognized
overnight courier or express mail, or on the third business day after mailing by
first class certified or registered mail, postage prepaid, return receipt
requested as follows:

          (a)  If to the Executive:

               203 East 72nd Street
               Apt. 2B
               New York, N.Y. 10021

          (b)  If to the Company:

               Dast Corporation
               d.b.a. Microcom Technologies
               16 East 52nd Street
               New York, N.Y. 10022
               Attention: Board of Directors

               with a copy to:

               Boston Ventures Management, Inc.
               One Federal Street
               23rd Floor
               Boston, MA 02110-2003
               Attention: James M. Wilson

or to such other address as the parties shall have designated by notice to the
other parties.

     Section 11. Governing Law. This Agreement shall be governed by and
     ----------  -------------
construed in accordance with the internal laws of the State of New York, without
regard to their choice of law provisions. Any suits brought hereunder shall be
brought in the state or federal courts located in the County of New York, State
of New York.

     Section 12. Amendments and Waivers. No amendment or waiver of this
     ----------  ----------------------
Agreement or any provision hereof shall be binding upon the party against whom
enforcement of such amendment or waiver is sought unless it is made in writing
and signed by or on behalf of such party. The waiver by either party of a breach
of any provision of this Agreement by the other party shall not operate and be
construed as a waiver or a continuing waiver by that party of the same or any
subsequent breach of any provision of this Agreement by the other party.

                                       7
<PAGE>

     Section 13.  Binding Effect. This Agreement shall be binding on and inure
     ----------   --------------
to the benefit of the parties hereto and their respective heirs, executors and
administrators, successors and assigns, except that it may not be assigned by
either party without the other party's consent, except that the Company may
assign this agreement to an entity that acquires substantially all of the
Company's assets.

     Section 14.  Entire Agreement. This Agreement constitutes the final and
     ----------   ----------------
entire agreement of the parties with respect to the matters covered hereby and
replaces and supersedes all other employment or similar agreements between the
Company and the Executive and all other agreements and understandings relating
hereto.

     Section 15.  Counterparts. This Agreement may be executed in any number of
     ----------   ------------
counterparts, including counterpart signature pages or counterpart facsimile
signature pages, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

                                       8
<PAGE>

     IN WITNESS WHEREOF, this Agreement has been executed as a sealed instrument
as of the date first above written.

                                        DAST CORPORATION
                                        d.b.a Microcom Technologies

                                        By: /s/ Daniel Nissanoff
                                            ----------------------------------
                                                                     (Title)

                                        /s/ Daniel Nissanoff
                                        --------------------------------------
                                        Daniel Nissanoff

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