Document:

<PAGE>

                                                                    EXHIBIT 10.2
                                                                    ------------

                             CONTRIBUTION AGREEMENT

     This Contribution Agreement, dated as of April 2, 2001 is made and entered
into by among SonicPort, Inc., a Nevada corporation (the "Company"), David Baeza
("Baeza") and Stanton Dodson ("Dodson"), and is made with reference to the
following:

     A.   Baeza and Dodson are principal shareholders, directors and executive
officers of the Company.

     B.   The Company has entered into that certain Amended and Restated Share
Exchange Agreement dated as of March 30, 2001 (the "Restated Share Exchange
Agreement") with US Dataworks, Inc. ("Allstate") and the stockholders of
Allstate (the "Sellers") pursuant to which the Company agreed to acquire from
the Sellers all of the Sellers' shares in Allstate (the "Acquisition").

     C.   The Restated Share Exchange Agreement requires the Company to issue
4,000,000 more shares of its Common Stock than authorized by the Company's
shareholders, and Baeza and Dodson have agreed to contribute such number of
shares to the treasury of the Company (the "Contribution") on the terms and
conditions set forth herein.

     D.   Baeza and Dodson have also agreed to sell to the Company an aggregate
of 2.2 million shares of the Common Stock of the Company (the "Sale") on the
terms and conditions set forth herein.

     E.   The Contribution and the Sale will strengthen the capital structure of
the Company and will assist the Company in raising additional capital, to the
benefit of Baeza and Dodson.

     F.   Baeza and Dodson are not receiving any consideration for the
Contribution other than the benefit to the Company of strengthening the capital
structure of the Company and assistance to the Company in raising additional
capital.

     NOW, THEREFORE, in consideration of the mutual promises and covenants set
forth herein, the parties hereby agree as follows:

     1.   Contribution to Capital. Concurrently with the closing of the Restated
          -----------------------
Share Exchange Agreement (the "Closing"), each of Baeza and Dodson shall
contribute an aggregate of 2.4 million shares of Common Stock of the Company
(the "Initial Contributed Shares") (on the basis of 1,450,000 shares from Baeza
and 950,000 shares from Dodson). Additionally, as and when requested by the
Board of Directors of the Company (but in no event later than six months from
the date hereof), Baeza and Dodson shall contribute an additional 1.6 million
shares of the Common Stock of the Company (the "Additional Contributed Shares")
(on the basis of 50% from Baeza and 50% from Dodson). The obligation to
contribute the Initial Contributed Shares and the Additional Contributed Shares
is several.
<PAGE>

     2.   Sales of Shares. Baeza and Dodson hereby agree to sell to the Company
          ---------------
and the Company agrees to purchase from Dodson and Baeza an aggregate of 2.2
million shares (the "Sold Shares") on the basis of 1,100,000 shares from each.
The sale of the Sold Shares shall be made concurrently with the Closing. The
purchase price for the Sold Shares shall be an aggregate of $220,000 payable
pursuant to a promissory notes in favor of Dodson and Baeza (the "Notes")
containing the following terms: (a) interest rate of 10% per annum; (b) the
principal amount of the Notes plus accrued interest shall be payable at such
time as the Company has raised on a cumulative basis gross proceeds from
financings (debt and/or equity) after the date hereof of an aggregate of
$5,000,000; provided, however, that if such amount has not been raised by the
second anniversary of the date of the Notes, no payment shall be due under the
Notes.

     3.   Representations, Warranties and Covenants of Baeza and Dodson. Each of
          -------------------------------------------------------------
Baeza and Dodson hereby represents, warrants and covenants to the Company as
follows:

          (a)  He has and will have good and marketable title to the Initial
Contributed Shares, the Additional Contributed Shares and the Sold Shares, and
upon contribution of the Additional Contributed Shares and the Sold Shares to
the Company and sale of the Sold Shares, the Company will acquire from him good
and marketable title to such Shares, free and clear of any liens or
encumbrances.

          (b)  He has all necessary power and authority to enter into, execute
and deliver this Contribution Agreement, to contribute to the Company the
Additional Contributed Shares and the Sold Shares, and sell the Sold Shares.

          (c)  This Contribution Agreement has been duly and validly executed by
him and (assuming the due authorization, execution and delivery by the Company)
constitutes the legal, valid and binding obligation of him, enforceable in
accordance with his terms, except as the same may be limited by applicable
bankruptcy, insolvency, reorganization, moratorium or similar laws affecting
creditors' rights generally or by general equitable principles affecting the
enforcement of contracts.

          (d)  Neither the execution and delivery by him of this Contribution
Agreement, nor the consummation of the Contribution and the Sale will constitute
a material default under, give rises to any right of termination or acceleration
of, or to a loss of any material benefits under any agreement to which he is a
party.

          (e)  At all times during the term hereof, he will own a sufficient
number of the Additional Contributed Shares and the Sold Shares to satisfy his
obligations hereunder.

     4.   Third Party Beneficiary. The Sellers shall be deemed to be third party
          -----------------------
beneficiaries of this Agreement.

                                       2
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have duly executed this Contribution
Agreement as of the day and year first above written.

                                    SonicPort, Inc., a Nevada corporation

                                    By: /s/ David Baeza
                                       _____________________________________
                                       President and Chief Executive Officer

                                    /s/ David Baeza
                                    _____________________________________
                                    David Baeza

                                    /s/ Stanton Dodson
                                    _____________________________________
                                    Stanton Dodson<PAGE>

<PAGE>

                                                                    EXHIBIT 10.3
                                                                    ------------

                         STOCKHOLDERS VOTING AGREEMENT

     This Stockholders Voting Agreement (the "Agreement"), dated as of April 2,
2001, by and among Sonicport, Inc., a Nevada corporation ("Company"), on the one
hand, David Baeza ("Baeza") and Stanton Dodson (each a "Stockholder" and,
collectively, the "Stockholders"), on the other hand, which is made with
reference to the following:

     A.   Pursuant to the Amended and Restated Share Exchange Agreement dated as
of March 30, 2001 (as the "Share Exchange Agreement") by and among the Company,
US Dataworks, Inc., a Delaware corporation f/k/a Allstate Dataworks, Inc.
("Allstate") and the stockholders of Allstate signatory therein, the Company
agreed to acquire all of the outstanding common stock of Allstate.  Capitalized
terms used and not defined herein shall have the respective meanings ascribed to
them in the Share Exchange Agreement.

     B.   Each of the Stockholders Beneficially Owns (as defined herein) the
number of shares of Company Common Stock set forth opposite such Stockholder's
name on Schedule I hereto (the "Shares"); and

     C.   As an inducement and a condition for Allstate entering into the Share
Exchange Agreement, the Stockholders have agreed to enter into this Agreement.

     NOW, THEREFORE, in consideration of the foregoing and the mutual premises,
representations, warranties, covenants and agreements contained herein, the
parties hereto hereby agree as follows:

     1.   Provisions Concerning Common Stock.
          ----------------------------------

          (a)  Provided that the transactions contemplated by the Share Exchange
Agreement have been consummated, each Stockholder agrees, severally and not
jointly and solely in his capacity as a shareholder of the Company and not as a
director of the Company, to vote (in the case of Shares for which the
Stockholder has exclusive voting power) the Shares Beneficially Owned by such
Stockholder, whether heretofore owned or hereafter acquired, at any meeting of
shareholders or by consensual action of shareholders for the election or removal
of (if such director has been designated by the Sellers for removal) of a
designee of the Sellers to the Company's board of directors, which designee
shall be subject to the reasonable approval of the Stockholders acting jointly,
it being understood that the sole reason for not approving such designee shall
be that such designee is then actively involved in a business which competes
with the Company or Allstate or that the Company would be required to make
disclosure under Rule 401(d) of Regulation S-B with respect to such designee.
The obligation of the Stockholders pursuant to this section shall extend until
the earlier to occur of (i) the fifth anniversary of the Closing Date or (ii)
the date when the Sellers own in the aggregate less than 15% of the Company's
then issued and outstanding common stock. Any director designation hereunder
shall be in writing and signed by the holders of more than 50% of the shares of
the Company Common Stock then held by the Sellers. For purposes of this
Agreement, "Beneficially Own" or "Beneficial Ownership" with respect to any
securities shall mean having "beneficial ownership"
<PAGE>

of such securities (as determined pursuant to Rule 13d-3 under the Securities
Exchange Act of 1934, as amended (the "Exchange Act")), including pursuant to
any written agreement or arrangement.

     2.   Representations and Warranties of Stockholders of the Company.  Each
          -------------------------------------------------------------
Stockholder of the Company hereby, severally and not jointly, represents and
warrants to the Company, as of the date of this Agreement, as follows:

          (a)  Ownership of Shares. On the date hereof, the Shares set forth
               -------------------
opposite such Stockholder's name on Schedule I hereto constitute all of the
Shares owned of record or Beneficially Owned by such Stockholder. Schedule I
hereto correctly indicates those Shares that are Beneficially Owned and held of
record by such Stockholder and those shares that are Beneficially Owned by such
Stockholder but not held of record by such Stockholder. Schedule I discloses the
number of Shares Beneficially Owned by the Stockholder for which the Stockholder
shares voting or dispositive power with another Person and identifies such other
Person or Persons. Except as referenced in the preceding sentence and Schedule I
and subject to (i) any applicable state and Federal securities laws and (ii) any
restrictions set forth in a legend on such Shares, such Stockholder has sole
voting power and sole power to issue instructions with respect to the matters
set forth in Section 1 of this Agreement, and sole power to agree to all of the
matters set forth in this Agreement, in each case with respect to all of the
Shares set forth opposite such Stockholder's name on Schedule I hereto, with no
limitations, qualifications or restrictions on such rights the effect of which
would materially adversely affect the ability of Stockholder to perform his or
her obligations hereunder.

          (b)  Power; Binding Agreement. (i) Such Stockholder has the legal
               ------------------------
capacity, power and authority to enter into and perform all of such
Stockholder's obligations under this Agreement; (ii) the execution, delivery and
performance of this Agreement by such Stockholder will not violate any other
agreement to which such Stockholder is a party including, without limitation,
any voting agreement, stockholder agreement or voting trust, the effect of which
would materially adversely affect the ability of Stockholder to perform his or
her obligations hereunder; (iii) this Agreement has been duly and validly
executed and delivered by such Stockholder and constitutes a valid and binding
agreement of such Stockholder, enforceable against such Stockholder in
accordance with its terms; (iv) there is no beneficiary or holder of a voting
trust certificate or other interest of any trust of which such Stockholder is
trustee who is not a party to this Agreement and whose consent is required for
the execution and delivery of this Agreement or the consummation by such
Stockholder of the transactions contemplated hereby; and (v) in the case where
such Stockholder is married and such Stockholder's Shares constitute community
property, this Agreement has been duly authorized, executed and delivered by,
and constitutes a valid and binding agreement of, such Stockholder's spouse,
enforceable against such spouse in accordance with its terms.

          (c)  No Conflicts. Subject to requirements, of the Securities Act, the
               ------------
Exchange Act, any relevant national securities exchange laws, (A) no filing
with, and no permit, authorization, consent or approval of, any state or federal
public body or authority is necessary for the execution of this Agreement by
such Stockholder or the consummation by such Stockholder of the transactions
contemplated hereby; and (B) none of the execution and delivery of this
Agreement by such Stockholder, the consummation by such Stockholder of the

                                       2
<PAGE>

transactions contemplated hereby or compliance by such Stockholder with any of
the provisions hereof shall (i) result in a violation or breach of, or
constitute (with or without notice or lapse of time or both) a default (or give
rise to any third party right of termination, cancellation, material
modification or acceleration) under any of the terms, conditions or provisions
of any note, bond, mortgage, indenture, license, contract, commitment,
arrangement, understanding, agreement or other instrument or obligation of any
kind to which such Stockholder is a party or by which such Stockholder or any of
such Stockholder's properties or assets may be bound or (ii) violate any order,
writ, injunction, decree, judgment, statute, rule or regulation applicable to
such Stockholder or any of such Stockholder's properties or assets, except for
those the effect of which, either individually or in the aggregate, would not
reasonably be expected to have a Material Adverse Effect.

     3.   Certain Covenants of the Stockholders of the Company. During the term
          ----------------------------------------------------
of and in accordance with this Agreement, each Stockholder of the Company
hereby, severally and not jointly, agrees with, and covenants to, the Company as
follows:

          (a)  Transfer. Such Stockholder shall be free to transfer his or its
               --------
Shares, but if such Stockholder is an individual and transfers Shares (A) to
such Stockholder's spouse, (B) to lineal descendants of such Stockholder, (C) to
a trust which is substantially for the benefit of such Stockholder, such
Stockholder's spouse or any lineal descendants of such Stockholder or (D) upon
the death of such Stockholder, then, as a precondition to any such transfer, the
transferee(s) thereof shall agree in a writing delivered to the Company to be
bound by the terms and conditions of this Agreement.

          (b)  Reliance by the Company. Such Stockholder understands and
               -----------------------
acknowledges that the Company is entering into the Share Exchange Agreement in
reliance upon such Stockholder's execution and delivery of this Agreement.

          (c)  Inconsistent Agreement. Such Stockholder shall not enter into any
               ----------------------
written agreement with any Person the effect of which would, as determined in
the sole discretion of such Stockholder, be inconsistent or violative of the
provisions and agreements contained in Sections 1 or 2(a) of this Agreement.

     4.   Further Assurances. From time to time during the term of this
          ------------------
Agreement, at the other party's reasonable request, each party hereto shall use
reasonable efforts to execute and deliver such additional documents and take
such further lawful action as may be necessary or desirable to consummate and
make effective, as promptly as practicable, the transactions contemplated by
this Agreement.

     5.   Termination. The representations, warranties, covenants and agreements
          -----------
contained in Sections 1 through 4 with respect to the Shares shall terminate at
such time as the Stockholder's obligations pursuant to Section 1 have
terminated.

     6.   Stockholder Capacity. No person executing this Agreement who is, or
          --------------------
becomes during the term hereof, a director or officer of the Company makes any
representation, warranty, covenant, agreement or understanding herein in his or
her capacity as such director or officer and nothing herein limits such
Stockholder's activities as a director or an officer of the Company.

                                       3
<PAGE>

Each Stockholder signs and agrees to be bound solely in his or her capacity as
the record and/or beneficial owner of such Stockholder's Shares owned as of the
date hereof.

     7.   Company/Stockholder. Notwithstanding anything herein to the contrary,
          -------------------
(i) each Stockholder shall not be responsible for, and his or her rights
hereunder shall not be affected by, the performance or nonperformance by the
Company of its obligations hereunder and under the Share Exchange Agreement and
(ii) the Company shall not be responsible for, and the Company's rights
hereunder shall not be affected by, the performance or nonperformance by the
Stockholder of the Company of his or her obligations hereunder.

     8.   Miscellaneous.
          -------------

          (a)  Entire Agreement. This Agreement and the Share Exchange Agreement
               ----------------
constitute the entire agreement between the parties with respect to the subject
matter hereof and supersede all other prior agreements and understandings, both
written and oral, between the parties with respect to the subject matter hereof.

          (b)  Certain Events. Each Stockholder agrees that this Agreement and
               --------------
the obligations hereunder shall attach to such Stockholder's Shares and shall be
binding upon any person or entity to which legal or beneficial ownership of such
Shares shall pass, whether by operation of law or otherwise, including, without
limitation, such Stockholder's heirs, guardians, administrators or successors.
Notwithstanding any transfer of Shares, the transferor shall remain liable for
the performance of all obligations under this Agreement of the Stockholder.

          (c)  Assignment. Except in accordance with the transfer provisions set
               ----------
forth in Section 3 hereof, this Agreement shall not be assigned by any party
hereto without the prior written consent of all of the parties hereto.

          (d)  Amendments, Waivers, Etc. This Agreement may not be amended,
               ------------------------
changed, supplemented, waived or otherwise modified or terminated, with respect
to any one or more Stockholders of the Company, except upon the execution and
delivery of a written agreement executed by the Company and such affected
Stockholder or Stockholders of the Company.

          (e)  Notices. All notices, requests, claims, demands and other
               -------
communications hereunder shall be in writing and shall be given (and shall be
deemed to have been duly received if so given) by hand delivery, telegram, telex
or telecopy, or by mail (registered or certified mail, postage prepaid, return
receipt requested) or by any courier service, such as Federal Express, providing
proof of delivery. All communications hereunder shall be delivered to the
respective parties at the following addresses:

          If to Company:           SonicPort, Inc.
                                   21621 Nordhoff Street
                                   Chatsworth, California  91311
                                   Attention:  President
                                   Facsimile:  (818) 700-8528

                                       4
<PAGE>

          If to David Baeza        c/o SonicPort, Inc.
                                   21621 Nordhoff Street
                                   Chatsworth, California  91311
                                   Facsimile:  (818) 700-8528

          If to Stanton Dodson     c/o SonicPort, Inc.
                                   21621 Nordhoff Street
                                   Chatsworth, California  91311
                                   Facsimile:  (818) 700-8528

or to such other address as the person to whom notice is given may have
previously furnished to the others in writing in the manner set forth above.

          (f)  Severability. Whenever possible, each provision or portion of any
               ------------
provision of this Agreement will be interpreted in such manner as to be
effective and valid under applicable law but if any provision or portion of any
provision of this Agreement is held to be invalid, illegal or unenforceable in
any respect under any applicable law or rule in any jurisdiction, such
invalidity, illegality or unenforceability will not affect any other provision
or portion of any provision in such jurisdiction, and this Agreement will be
reformed, construed and enforced in such jurisdiction as if such invalid,
illegal or unenforceable provision or portion of any provision had never been
contained herein.

          (g)  Specific Performance.  Each of the parties hereto recognizes and
               --------------------
acknowledges that a breach by it of any covenants or agreements contained in
this Agreement will cause the other party to sustain damages for which it would
not have an adequate remedy at law for money damages, and therefore each of the
parties hereto agrees that in the event of any such breach the aggrieved party
shall be entitled to the remedy of specific performance of such covenants and
agreements and injunctive and other equitable relief in addition to any other
remedy to which it may be entitled, at law or in equity.

          (h)  Remedies Cumulative. All rights, powers and remedies provided
               -------------------
under this Agreement or otherwise available in respect hereof at law or in
equity shall be cumulative and not alternative, and the exercise of any thereof
by any party shall not preclude the simultaneous or later exercise of any other
such right, power or remedy by such party.

          (i)  No Waiver.  The failure of any party hereto to exercise any
               ---------
right, power or remedy provided under this Agreement or otherwise available in
respect hereof at law or in equity, or to insist upon compliance by any other
party hereto with its obligations hereunder, and any custom or practice of the
parties at variance with the terms hereof, shall not constitute a waiver by such
party of its right to exercise any such or other right, power or remedy or to
demand such compliance.

          (j)  Third Party Beneficiaries. This Agreement is intended to be for
               -------------------------
the benefit of, and shall be enforceable by, the Sellers, and each of them.

          (k)  Governing Law.  This Agreement shall be governed and construed in
               -------------
accordance with the laws of the State of California, without giving effect to
the principles of conflicts of law thereof. In addition, each of the parties
hereto agrees that any action relating to

                                       5
<PAGE>

this Agreement or any of the transactions contemplated hereunder shall be
exclusively conducted in any Federal or state court sitting in the State of
California.

          (l)  Descriptive Headings. The descriptive headings used herein are
               --------------------
inserted for convenience of reference only and are not intended to be part of or
to affect the meaning or interpretation of this Agreement.

          (m)  Counterparts. This Agreement may be executed in counterparts,
               ------------
each of which shall be deemed to be an original, but all of which, taken
together, shall constitute one and the same Agreement.

           [The remainder of this page is intentionally left blank.]

                                       6
<PAGE>

     IN WITNESS WHEREOF, the Company and each Stockholder have caused this
Agreement to be duly executed as of the day and year first above written.

                              SONICPORT, INC.

                              /s/ David Baeza
                              ________________________________________
                              By:
                              Title: President and Chief Executive Officer

                              STOCKHOLDERS:

                              /s/ David Baeza
                              ________________________________________
                              David Baeza

                              /s/ Stanton Dodson
                              ________________________________________
                              Stanton Dodson

                                       7
<PAGE>

                                  Schedule I
                         Stockholders Voting Agreement
                         -----------------------------

<TABLE>
<CAPTION>
   Name of Stockholder                                Number of Shares
   -------------------                                ----------------
<S>                                  <C>
David Baeza                          Beneficially Owned and Held of Record:  7,396,000*
                                     --------------------------------------

Stanton Dodson                       Beneficially Owned and Held of Record:  6,417,915*
                                     --------------------------------------
</TABLE>

* Subject to reduction pursuant to a Contribution Agreement dated as of the date
hereof.

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