APTIMUS, INC.

                           Offer to Purchase for Cash
                                      up to
                                10,750,000 Shares
                               at $0.48 Per Share

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THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 5:00 P.M., EASTERN TIME, ON
MONDAY, NOVEMBER 12, 2001, UNLESS THE OFFER IS EXTENDED (THE "EXPIRATION DATE.")
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                                October 10, 2001

To Brokers, Dealers, Banks, Trust Companies and other Nominees:

      Aptimus, Inc., a Washington corporation (the "Company"), is offering to
purchase up to 10,750,000 shares ("Shares") of the outstanding common stock, no
par value per share (the "Common Stock"), of the Company at a price of $0.48 per
Share, (the "Offer Price"), upon the terms and subject to the conditions set
forth in the Company's Offer to Purchase dated October 10, 2001 (the "Offer to
Purchase"), and in the related Letter of Transmittal (which, together with any
amendments or supplements thereto, constitute the "Offer").

      If a shareholder desires to tender Shares pursuant to the Offer and such
shareholder's share certificates are not immediately available or time will not
permit all required documents to reach the Depositary prior to the Expiration
Date or the procedures for book-entry transfer cannot be completed on a timely
basis, such Shares may nevertheless be tendered according to the guaranteed
delivery procedures set forth in "The Tender Offer - Procedures for tendering
shares" of the Offer to Purchase. See Instruction 2 of the Letter of
Transmittal. Delivery of documents to the DTC (as defined in the Offer to
Purchase) in accordance with the DTC's procedures does not constitute delivery
to the Depositary.

      The Offer is conditioned upon, among other things, any of the following
events occurring after the date of the Offer to Purchase and before the
Expiration Date that, in the Company's judgment and regardless of the
circumstances giving rise to the event or events (including any action or
omission to act by the Company), makes it inadvisable to proceed with the tender
offer or with acceptance for payment: (a) there shall have been threatened,
instituted or pending any action or proceeding by any government or
governmental, regulatory or administrative agency, authority or tribunal or any
other person, domestic or foreign, before any court, authority, agency or
tribunal that directly or indirectly (i) challenges the making of the tender
offer, the acquisition of some or all of the shares under the tender offer or
otherwise relates in any manner to the tender offer or (ii) in the Company's
judgment, could materially and adversely affect its business, condition
(financial or other), income, operations or prospects, or otherwise materially
impairs in any way the contemplated future conduct of its business or materially
impairs the contemplated benefits of the tender offer to it; or (b) any change
or changes shall have occurred in its business, financial condition, assets,
income, operations, prospects or share ownership that, in the Company's
judgment, is or may be material and adverse to it. See "The Tender Offer -
Conditions of the tender offer" of the Offer to Purchase.

      Please furnish copies of the enclosed materials to those of your clients
for whom you hold Shares registered in your name or in the name of your nominee.

      Enclosed herewith for your information and forwarding to your clients are
copies of the following documents:

      1.    Offer to Purchase dated October 10, 2001;



      2.    Letter of Transmittal to be used by shareholders of the Company in
            accepting the Offer (facsimile copies of the Letter of Transmittal
            with original signatures and all required signature guarantees may
            be used to tender the Shares);

      3.    A printed form of letter that may be sent to your clients for whose
            account you hold Shares in your name or in the name of a nominee,
            with space provided for obtaining such client's instructions with
            regard to the Offer;

      4.    Notice of Guaranteed Delivery to be used to accept the Offer if
            certificates for Shares are not immediately available or if time
            will not permit all required documents to reach the Depositary by
            the Expiration Date or if the procedures for book-entry transfer
            cannot be completed on a timely basis;

      5.    Guidelines of the Internal Revenue Service for Certification of
            Taxpayer Identification Number on Substitute Form W-9; and

      6.    Return envelope addressed to Mellon Investor Services LLC, as
            Depositary.

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PLEASE NOTE THAT THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 5:00 P.M.,
EASTERN TIME, ON MONDAY, NOVEMBER 12, 2001, UNLESS THE OFFER IS EXTENDED.
================================================================================

WE URGE YOU TO CONTACT YOUR CLIENTS AS PROMPTLY AS POSSIBLE.

      The Company will pay no fees or commissions to any broker or dealer or
other person (other than the Depositary and Information Agent, as described in
the Offer to Purchase) in connection with the solicitation of tenders of Shares
pursuant to the Offer. You will be reimbursed by the Company upon request for
customary mailing and handling expenses incurred by you in forwarding the
enclosed Offer materials to your customers.

      The Company will pay or cause to be paid any transfer taxes payable on the
transfer of Shares to it, except as otherwise provided in Instruction 5 of the
Letter of Transmittal.

      Questions and requests for additional copies of the enclosed material may
be directed to the Information Agent at its address and telephone number set
forth on the back cover of the enclosed Offer to Purchase.

                                                      Very truly yours,


                                                      APTIMUS, INC.

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NOTHING CONTAINED HEREIN OR IN THE ENCLOSED DOCUMENTS SHALL RENDER YOU OR ANY
OTHER PERSON THE AGENT OF THE COMPANY, THE DEPOSITARY, THE INFORMATION AGENT OR
ANY AFFILIATE THEREOF OR AUTHORIZE YOU OR ANY OTHER PERSON TO GIVE ANY
INFORMATION OR MAKE ANY REPRESENTATION ON BEHALF OF ANY OF THEM WITH RESPECT TO
THE OFFER OTHER THAN THE DOCUMENTS ENCLOSED AND THE STATEMENTS CONTAINED
THEREIN.
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