Document:

EXHIBIT 4.49

                                 PROMISSORY NOTE

$15,085.92                Milpitas, California                 September 8, 2000

For value received,  ADATOM.com, Inc., promises to pay Richard Barton the sum of
Fifteen Thousand and Eighty Five Dollars and Ninety-Two cents  ($15,085.92) with
interest at the rate of Ten  Percent  per annum  (10%)  until  paid.  Any unpaid
interest  will  become  part  of  the  principal.   Interest  payable  quarterly
commencing  on  September  30, 2000.  Principal of Fifteen  Thousand One hundred
Seventy Six dollars and Eighty-Five cents ($15, 176.85) is due in one payment on
September  30, 2000.  Principal may be paid in whole or in part prior to the due
date without penalty or premium.

Should  default be made in payment of principal  and/or  interest  when due, the
whole sum of principal and interest shall become  immediately due, at the option
of the  holder of the note.  If action be  instituted  on this  note,  The maker
promises to pay such sum as a Court may fix as attorney's fees.

Adatom.com, Inc.

By: /s/ MICHAEL M. WHEELER
    -----------------------
        Michael M. Wheeler
        Controller

                                      E-47EXHIBIT 4.50

                                 PROMISSORY NOTE

$20,000                      Milpitas, California             September 15, 2000

For value received,  ADATOM.com, Inc., promises to pay Richard Barton the sum of
Twenty  Thousand and no cents ($20,000) with interest at the rate of Ten Percent
per annum  (10%)  until  paid.  Any  unpaid  interest  will  become  part of the
principal.  Interest  payable  quarterly  commencing on September 30, 2000.  The
Principal of Twenty Thousand  Eighty Seven dollars and  Sixty-Seven  Cents ($20,
087.67) is due in one payment on September  30, 2000.  Principal  may be paid in
whole or in part prior to the due date without penalty or premium.

Should  default be made in payment of principal  and/or  interest  when due, the
whole sum of principal and interest shall become  immediately due, at the option
of the  holder of the note.  If action be  instituted  on this  note,  The maker
promises to pay such sum as a Court may fix as attorney's fees.

Adatom.com, Inc.

By: /s/ MICHAEL M. WHEELER
    -----------------------
        Michael M. Wheeler
        Controller

                                      E-48EXHIBIT 4.51

                                 PROMISSORY NOTE

$4,719.23                    Milpitas, California             September 21, 2000

For value received,  ADATOM.com, Inc., promises to pay Richard Barton the sum of
Four  Thousand  Seven  Hundred  and  Nineteen  dollars  and  Twenty-Three  Cents
($4,719.23) with interest at the rate of Ten Percent per annum (10%) until paid.
Any  unpaid  interest  will  become  part  of the  principal.  Interest  payable
quarterly commencing on September 30, 2000. The Principal of Four Thousand Seven
Hundred Thirty dollars and Eighty Seven cents  ($4,730.87) is due in one payment
on September  30, 2000.  Principal  may be paid in whole or in part prior to the
due date without penalty or premium.

Should  default be made in payment of principal  and/or  interest  when due, the
whole sum of principal and interest shall become  immediately due, at the option
of the  holder of the note.  If action be  instituted  on this  note,  The maker
promises to pay such sum as a Court may fix as attorney's fees.

Adatom.com, Inc.

By: /s/ MICHAEL M. WHEELER
    -----------------------
        Michael M. Wheeler
        Controller

                                      E-49EXHIBIT 4.52

                                 PROMISSORY NOTE

$8,720.02                  Milpitas, California                  August 16, 2000

For value received, ADATOM.com, Inc., promises to pay Sri Jagannathan the sum of
Eight  Thousand  Seven Hundred  Twenty  dollars and two cents  ($8,720.02)  with
interest at the rate of Ten  Percent  per annum  (10%)  until  paid.  Any unpaid
interest  will  become  part  of  the  principal.   Interest  payable  quarterly
commencing  on September  30, 2000.  Principal of Eight  thousand  Eight hundred
Twenty Seven dollars and Fifty-three  cents ($8,827.53) is due in one payment on
September  30, 2000.  Principal may be paid in whole or in part prior to the due
date without penalty or premium.

Should  default be made in payment of principal  and/or  interest  when due, the
whole sum of principal and interest shall become  immediately due, at the option
of the  holder of the note.  If action be  instituted  on this  note,  The maker
promises to pay such sum as a Court may fix as attorney's fees.

Adatom.com, Inc.

By: /s/ MICHAEL M. WHEELER
    -----------------------
        Michael M. Wheeler
        Controller

                                      E-50EXHIBIT 4.53

THIS WARRANT AND THE  SECURITIES  ISSUABLE  UPON  EXERCISE  HEREOF HAVE NOT BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933 (THE "SECURITIES ACT") NOR UNDER ANY
STATE  SECURITIES  LAW AND MAY  NOT BE  PLEDGED,  SOLD,  ASSIGNED  OR  OTHERWISE
TRANSFERRED UNTIL (1) A REGISTRATION  STATEMENT UNDER THE SECURITIES ACT AND ANY
APPLICABLE STATE  SECURITIES LAWS HAS BECOME EFFECTIVE WITH RESPECT THERETO,  OR
(2) RECEIPT BY THE COMPANY OF AN OPINION OF COUNSEL TO THE COMPANY TO THE EFFECT
THAT  REGISTRATION  UNDER THE SECURITIES ACT OR APPLICABLE STATE SECURITIES LAWS
IS NOT REQUIRED IN CONNECTION WITH THE PROPOSED TRANSFER.

THIS  WARRANT MAY NOT BE  EXERCISED  EXCEPT IN  COMPLIANCE  WITH ALL  APPLICABLE
FEDERAL AND STATE SECURITIES LAWS TO THE REASONABLE  SATISFACTION OF THE COMPANY
AND LEGAL COUNSEL FOR THE COMPANY.

           Void after 5:00 p.m. New York City Time, on August 31, 2006

               Warrant to Purchase 300,000 Shares of Common Stock

               WARRANT TO PURCHASE COMMON STOCK, PAR VALUE $0.01,

                                       OF

                                ADATOM.COM, INC.

         This is to Certify That, FOR VALUE RECEIVED, Sridhar Jagannathan or his
permitted assigns ("Holder") is entitled to purchase,  subject to the provisions
of this Warrant, from Adatom.com,  Inc., a Delaware corporation (the "Company"),
up to 300,000  fully paid,  validly  issued and  nonassessable  shares of Common
Stock,  par value $.01 per share, of the Company  ("Common Stock") at a price of
$1.25 per share at any time or from time to time  during the period  from August
31, 2003 the earliest  exercise  date to August 31, 2006, as set forth under (a)
below,  but not later than 5:00 p.m. New York City Time, on August 31, 2006. The
number of  shares  of Common  Stock to be  received  upon the  exercise  of this
Warrant and the price to be paid for each share of Common  Stock may be adjusted
from  time to time  as  hereinafter  set  forth.  The  shares  of  Common  Stock
deliverable  upon  such  exercise,  and as  adjusted  from  time  to  time,  are
hereinafter  sometimes referred to as "Warrant Shares" and the exercise price of
a share of Common Stock in effect at any time and as adjusted  from time to time
is hereinafter sometimes referred to as the "Exercise Price."

         (a)      EXERCISE OF WARRANT.  This Warrant may be exercised in whole,
or in part in increments of not less than 20,000 shares, at any time starting on
August 31, 2003 or from time to time, until August 31, 2006. This Warrant may be
exercised by presentation  and surrender  hereof to the Company at its principal
office,  or at the office of its stock transfer agent, if any, with the Purchase
Form annexed hereto as Exhibit A duly executed and accompanied by payment of the
Exercise Price for the number of Warrant  Shares  specified in such form and any
and all transfer taxes applicable to such exercise. As soon as practicable after
each such  exercise,  but not later than 30 days from the date of such exercise,
the Company shall issue and deliver to the Holder a certificate  or  certificate
for the Warrant Shares  issuable upon such  exercise,  registered in the name of
the Holder or its  designee.  If this Warrant  should be exercised in part only,
the Company shall, upon surrender of this Warrant for cancellation,  execute and
deliver a new Warrant  evidencing  the rights of the Holder  thereof to purchase
the balance of the Warrant Shares purchasable thereunder.

         (b)      RESERVATION OF SHARES.  The Company shall at all times reserve
for issuance and/or delivery upon exercise of this Warrant such number of shares
of its Common Stock as shall be required for issuance and delivery upon exercise
of the Warrant.

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<PAGE>

         (c)      FRACTIONAL SHARES. No fractional shares or script representing
fractional  shares  shall be issued  upon the  exercise  of this  Warrant.  With
respect to any  fraction of a share  called for upon any  exercise  hereof,  the
Company  shall  pay to the  Holder  an  amount  in cash  equal to such  fraction
multiplied by the Current Market Value of a share, determined as follows:

         (1)      If the Common Stock is listed on a national securities
         exchange or admitted to unlisted trading privileges on such exchange or
         listed for trading on the Nasdaq  National  Market,  the Current Market
         Value shall be the last reported sale price of the Common Stock on such
         exchange  or  market  on the  last  business  day  prior to the date of
         exercise  of this  Warrant or if no such sale is made on such day,  the
         average  closing bid and asked prices for such day on such  exchange or
         market; or

         (2)      If the  Common  Stock is not so  listed  or  admitted  to
         unlisted  trading  privileges,  but is traded on the  Nasdaq  Small Cap
         Market,  the Current  Market  Value shall be the average of the closing
         bid and asked  prices  for such day on such  market  and if the  Common
         Stock is not so traded,  the Current  Market Value shall be the mean of
         the  last  reported  bid and  asked  prices  reported  by the  National
         Quotation  Bureau,  Inc. on the last  business day prior to the date of
         the exercise of this Warrant if such prices are so reported; or

         (3)      If the  Common  Stock is not so  listed  or  admitted  to
         unlisted  trading  privileges  and  bid  and  asked  prices  are not so
         reported,  the Current  Market Value shall be an amount,  not less than
         book value  thereof as at the end of the most recent fiscal year of the
         Company  ending  prior  to the  date of the  exercise  of the  Warrant,
         determined in such reasonable  manner as may be prescribed by the Board
         of Directors of the Company.

         (d)      TRANSFER, ASSIGNMENT OR LOSS OF WARRANT.

         (1)      Neither  this  Warrant,  nor the shares of Common Stock issued
         upon  the  exercise  of  all  or a  portion  of  this  Warrant,  may be
         transferred  (other than by will or pursuant to the laws of descent and
         distribution)  except with the  Company's  prior written  consent.  Any
         transfer of the Warrant,  or the shares of Common Stock issued upon the
         exercise of the Warrant,  must be done in  compliance  with  applicable
         federal and state securities laws;

         (2)      By acceptance of this Warrant, the Holder agrees to be bound
         by the terms of a  standard  market  standoff  agreement  requested  by
         underwriters with respect to a public offering of Common Stock acquired
         pursuant to this Warrant;

         (3)      Upon  surrender  of this  Warrant to the  Company at its prin-
         cipal office or at the office of its stock transfer agent, if any, with
         the Assignment  Form annexed hereto duly executed and funds  sufficient
         to pay any  transfer  tax,  and with the  consent of the  Company,  the
         Company shall, without charge, execute and deliver a new Warrant in the
         name of the assignee  named in such  instrument of assignment  and this
         Warrant shall promptly be cancelled.

         (4)      Upon receipt by the Company of evidence  satisfactory to it of
         the loss, theft, destruction or mutilation of this Warrant, and (in the
         case  of  loss,  theft  or  destruction)  of  reasonably   satisfactory
         indemnification,  and upon surrender and  cancellation of this Warrant,
         if  mutilated,  the Company  will  execute and deliver a new Warrant of
         like tenor and date. Any such new Warrant  executed and delivered shall
         constitute  an  additional  contractual  obligation  on the part of the
         Company,  whether or not this Warrant so lost,  stolen,  destroyed,  or
         mutilated shall be at any time enforceable by anyone.

         (e)      ANTI-DILUTION PROVISIONS.  The Exercise Price in effect at any
time and the number and kind of securities  purchasable upon the exercise of the
Warrant shall be subject to  adjustment  from time to time upon the happening of
certain events as follows:

         (1)      In case the Company shall

                                      E-52

<PAGE>

                  (i)      declare a dividend or make a distribution on its out-
                  standing shares of Common Stock in shares of Common Stock,

                  (ii)     subdivide or reclassify its outstanding shares of
                  Common Stock into a greater number of shares, or

                  (iii)    combine or reclassify its outstanding shares of
                  Common Stock into a smaller  number of shares,

         the number of shares  subject to the Warrant  shall be  proportionately
         increased,   and  the   Exercise   Price  of  the   Warrant   shall  be
         proportionately  decreased,  in the case of actions specified in (l)(i)
         or (ii)  above;  and the  number  of  shares  shall be  proportionately
         decreased,  and the Exercise Price  proportionately  increased,  in the
         case of actions  specified in (l)(iii) above.  Such adjustment shall be
         made successively whenever any event listed above shall occur.

         (2)      No adjustment in the Exercise  Price shall be required  unless
         such adjustment  would require an increase or decrease of at least five
         cents ($0.05) in such price;  provided,  however,  that any adjustments
         which by  reason of this  Subsection  (2) are not  required  to be made
         shall be  carried  forward  and taken into  account  in any  subsequent
         adjustment  required to be made hereunder.  All calculations under this
         Section (e) shall be made to the nearest  cent or to the nearest  whole
         share, as the case may be.

         (3)      Whenever the Exercise Price is adjusted,  as herein  provided,
         the Company shall  promptly but no later than 30 days after any request
         for such an adjustment by the Holder,  cause a notice setting forth the
         adjusted  Exercise Price and adjusted number of Warrant Shares issuable
         upon  exercise  of  each  Warrant,   and,  if  requested,   information
         describing  the  transactions  giving rise to such  adjustments,  to be
         mailed to the Holder at his last  address  appearing  in the records of
         the  Company,  and  shall  cause a copy  thereof  to be  mailed  to its
         transfer  agent,  if any. The Company may retain a firm of  independent
         certified  public  accountants  selected by the Board of Directors (who
         may be the regular  accountants  employed  by the  Company) to make any
         computation  required by this Section (e), and a certificate  signed by
         such firm  shall be  conclusive  evidence  of the  correctness  of such
         adjustment.

         (4)      In the event that at any time,  as a result of an  adjustment
         made  pursuant  to  Subsection  (1) above,  the Holder of this  Warrant
         thereafter  shall become entitled to receive any shares of the Company,
         other than Common Stock,  thereafter the number of such other shares so
         receivable upon exercise of this Warrant shall be subject to adjustment
         from  time to time in a manner  and on terms as  nearly  equivalent  as
         practicable  to  the  provisions  with  respect  to  the  Common  Stock
         contained in Subsection (1) above.

         (5)      Irrespective of any adjustments in the Exercise Price or the
         number or kind of shares  purchasable  upon  exercise of this  Warrant,
         Warrants  theretofore or thereafter  issued may continue to express the
         same price and number and kind of shares as are stated in the  Warrants
         previously issued.

         (f)      REGISTRATION RIGHTS. The Company hereby grants the Holder the
right to "piggy back" the Warrant Shares on each Registration  Statement for the
sale of Common  Stock  filed by the Company  (or any  securities  of a successor
company of the Company) at the Company's cost and expense (except those incurred
by the Holder for legal fees and  commissions).  The  obligations of the Company
under this  Section  (f) expire  upon the  earlier of (i) after the  Company has
afforded the  opportunity for the Holder to exercise  registration  rights under
this Section (f) for three  registrations,  (ii) when all of the Warrant  Shares
held by the  Holder  may be sold by the  Holder  under  Rule 144  without  being
subject to any volume  restrictions,  or (iii) the fifth anniversary of the date
of this  Warrant.  The  Company  shall give the  Holder at least 30 days'  prior
notice of its intent to file a Registration Statement. The Company shall use its
best  efforts to keep any  Registration  Statement  onto which Holder has "piggy
backed" his Warrant Shares effective for a period of not less than 270 days from
the date  whereby  the  Holder is first  entitled  to sell  thereunder,  or such
shorter  period  terminating  when the Holder has sold all of his  shares.  Such
"piggy back" rights are subject to standard underwriters' approval and holdback,
whereby the Holder's rights to sell in a public offering may be limited pro rata
with the other stockholders,  and shall not apply to any Warrant Shares that can
be sold under SEC Rule 144 without  volume  restrictions.  For  purposes of this
Section  (f),  the term

                                      E-53

<PAGE>

Registration  Statement  shall mean any  registration  statement for the sale of
common stock or other  securities filed by the Company or filed by any successor
entity (in the case of merger, reclassification,  change, consolidation, sale or
conveyance of the Company) under the Act (except for a registration statement on
Form S-4, Form S-8 or any successor  form thereto and except for a  registration
statement filed pursuant to that certain  Registration  Rights Agreement between
the Company and the purchasers of the Company's  Series A Convertible  Preferred
Stock, dated June 22, 2000).

         (g)      NOTICES  TO  WARRANT  HOLDERS.  So long as this  Warrant shall
be  outstanding,  (i)  if the  Company  shall  pay  any  dividend  or  make  any
distribution  upon the Common  Stock or (ii) if the  Company  shall offer to the
holders of Common  Stock for  subscription  or purchase by them any share of any
class or any other rights or (iii) if any capital reorganization of the Company,
reclassification of the capital stock of the Company, consolidation or merger of
the Company with or into another corporation,  sale, lease or transfer of all or
substantially  all  of  the  property  and  assets  of the  Company  to  another
corporation, or voluntary or involuntary dissolution,  liquidation or winding up
of the Company shall be effected, then in any such case, the Company shall cause
to be mailed by  certified  mail to the Holder,  at least 15 days prior the date
specified in (x) or (y) below,  as the case may be, a notice  containing a brief
description of the proposed action and stating the date on which (x) a record is
to be taken for the purpose of such  dividend,  distribution  or rights,  or (y)
such reclassification, reorganization, consolidation, merger, conveyance, lease,
dissolution,  liquidation or winding up is to take place and the date, if any is
to be fixed, as of which the holders of Common Stock or other  securities  shall
receive  cash  or  other  property   deliverable  upon  such   reclassification,
reorganization,  consolidation,  merger, conveyance, dissolution, liquidation or
winding up.

         (h)      COMPLIANCE WITH SECURITIES ACT. The Holder, by acceptance
hereof,

         (1)      represents (i) that this Warrant and the Common Stock to be
         issued upon exercise of this Warrant are being  acquired for investment
         only and not with a view toward  distribution or resale,  and (ii) that
         he will not offer,  sell or  otherwise  dispose of this  Warrant or any
         Common Stock  purchasable  upon  exercise of this Warrant  except under
         circumstances  which will not result in a violation  of the  Securities
         Act; and

         (2)      agrees that upon  exercise of this  Warrant,  the Holder shall
         (i) submit to the  Company a signed  copy of  Exhibits A and C attached
         hereto,  (ii)  provide  such  additional   information  regarding  such
         holder's  financial  and  investment  background  as  the  Company  may
         reasonably  request,  and (iii) all shares of Common  Stock issued upon
         exercise of this Warrant (unless  registered  under the Securities Act)
         shall be stamped or imprinted with a restrictive  legend  substantially
         in the form of the following:

                  THESE SHARES HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT
                  OF 1933 (THE "SECURITIES  ACT") NOR UNDER ANY STATE SECURITIES
                  LAWS  AND MAY NOT BE  PLEDGED,  SOLD,  ASSIGNED  OR  OTHERWISE
                  TRANSFERRED  UNTIL  (1) A  REGISTRATION  STATEMENT  UNDER  THE
                  SECURITIES ACT AND ANY APPLICABLE  STATE  SECURITIES  LAWS HAS
                  BECOME EFFECTIVE WITH RESPECT  THERETO,  OR (2) RECEIPT BY THE
                  COMPANY OF AN OPINION OF COUNSEL TO THE  COMPANY TO THE EFFECT
                  THAT REGISTRATION UNDER THE SECURITIES ACT OR APPLICABLE STATE
                  SECURITIES  LAWS  IS  NOT  REQUIRED  IN  CONNECTION  WITH  THE
                  PROPOSED TRANSFER.

         (i)      NO AVOIDANCE.The Company will not, by amendment of its charter
or through reorganization, consolidation, merger, dissolution, sale of assets or
any other voluntary action, avoid or seek to avoid the observance or performance
of any of the terms of this Warrant,  but will at all times in good faith assist
in the  carrying  out of all such terms and in the taking of all such  action as
may be necessary or  appropriate in order to protect the rights of the holder of
this Warrant against impairment.

         (j)      CERTAIN LIMITATIONS OF HOLDER. The Holder, by acceptance here-
of, agrees that:

         (1)      STOP-TRANSFER  NOTICES.  In order to  ensure  compliance  with
         the restrictions  referred to herein, the Company may issue appropriate
         "stop transfer" instructions to its transfer agent, if any, and, if the

                                      E-54

<PAGE>

         Company transfers its own securities, it may make appropriate notations
         to the same effect in its own records;

         (2)      REFUSAL TO  TRANSFER.  The  Company  shall not be  required to
         (i) transfer the Warrant on its books or transfer any  securities  that
         have been sold or  otherwise  transferred  in  violation  of any of the
         provisions of this  Warrant;  or (ii) treat as the owner of the Warrant
         or any such  securities,  or accord the right to vote or pay  dividends
         to, any  purchaser or other  transferee to whom such  securities  shall
         have been so transferred; and

         (3)      RIGHTS OF STOCKHOLDERS.  No holder of the Warrant shall be
         entitled to vote or receive  dividends or be deemed a stockholder,  nor
         shall anything contained herein be construed to confer upon the Holder,
         as such, any of the rights of a stockholder of the Company or any right
         to vote for the election of  directors or upon any matter  submitted to
         stockholders at any meeting thereof,  or to give or withhold consent to
         any corporate  action (whether upon any  recapitalization,  issuance of
         stock,  reclassification  of  stock,  change  of par value or change of
         stock to no par value, consolidation, merger, conveyance, or otherwise)
         or to receive notice of meetings,  or to receive  dividends,  until the
         Warrant  shall  have been  exercised  and the Common  Stock  shall have
         become deliverable, as provided herein.

         (k)      GOVERNING LAW.  The terms and conditions of this Warrant shall
be  governed  by and  construed  in  accordance  with the  laws of the  State of
Delaware.

         (l)      MISCELLANEOUS. The  headings in this  Warrant are for purposes
of convenience  and reference only, and shall not be deemed to constitute a part
hereof.  Neither  this  Warrant  nor any term  hereof  may be  changed,  waived,
discharged or terminated in any manner except by an instrument in writing signed
by the Company and the Holder.

         All notices and other  communications from the Company to the holder of
this Warrant  shall be mailed by  first-class  registered  or certified  mail or
recognized  commercial courier service,  postage or delivery charges prepaid, to
the  address  furnished  to the  Company in  writing by the last  holder of this
Warrant who shall have furnished an address to the Company in writing.

         IN WITNESS  WHEREOF,  the Company  has caused this  Warrant to Purchase
Common Stock to be duly executed by one of its duly authorized officers.

                                                     ADATOM.COM, INC.

                                         By:      _____________________________
                                                     Richard S. Barton
                                                     Chairman of the Board
                                                     and Chief Executive Officer

                                         Date:    August 31, 2000

                                      E-55

<PAGE>

                                    Exhibit A

                                  PURCHASE FORM

                          Dated ____________, 20_______

1. The undersigned  hereby  irrevocably elects to exercise the within Warrant to
the extent of purchasing _______ shares of Common Stock and hereby makes payment
of _____________ in payment of the actual exercise price thereof,  together with
all applicable transfer taxes, if any.

2. Please issue a certificate or certificates representing said shares of Common
Stock in the  name of the  undersigned  or in such  other  name as is  specified
below:

                              (Please typewrite or print in block letters)

                        ---------------------------------
                                     (Name)
                        ---------------------------------

                        ---------------------------------
                                    (Address)

3. The undersigned has reviewed, signed and enclosed an Investment Representa-
tion Statement in the form attached as Exhibit C to the Warrant.

                                               ---------------------------------
                                                     Signature of Warrantholder

                                      E-56

<PAGE>

                                    Exhibit B

                                 ASSIGNMENT FORM

     FOR VALUE RECEIVED, ______________ hereby sells, assigns and transfers unto

Name _______________________________________
(Please typewrite or print in block letters)

Address ____________________________________

the right to purchase Common Stock  represented by this Warrant to the extent of
______ shares as to which such right is exercisable and does hereby  irrevocably
constitute  and appoint  ___________  as  attorney,  to transfer the same on the
books of the Company with full power of substitution in the premises.

Date ____________, 20_______

Signature _____________________________

                                      E-57

<PAGE>

                                    Exhibit C

                                ADATOM.COM, INC.

                                     WARRANT

                       INVESTMENT REPRESENTATION STATEMENT

AMOUNT:  ________________________

DATE:             _______________, 2000

         In connection  with the purchase of the  above-listed  securities  (the
"Securities") from ADATOM.COM, INC. ("the Company"), I the undersigned Purchaser
represent to the Company the following:

         (a) I am  aware  of  the  Company's  business  affairs  and  financial
condition,  and have acquired sufficient  information about the Company to reach
an  informed  and  knowledgeable  decision  to  acquire  the  Securities.  I  am
purchasing these Securities for my own account for investment  purposes only and
not with a view to, or for the resale in  connection  with,  any  "distribution"
thereof for  purposes of the  Securities  Act of 1933,  as amended  ("Securities
Act").

         (b) I understand that the Securities have not been registered under the
Securities Act in reliance upon a specific exemption therefrom,  which exemption
depends upon, among other things,  the bona fide nature of my investment  intent
as expressed herein.

         (c) I further  understand that the Securities must be held indefinitely
unless  subsequently  registered under the Securities Act or unless an exemption
from  registration  is otherwise  available.  Moreover,  I  understand  that the
Company is under no  obligation  to register  the  Securities.  In  addition,  I
understand that the certificate evidencing the Securities will be imprinted with
a  legend  which  prohibits  the  transfer  of the  Securities  unless  they are
registered  or such  registration  is not required in the opinion of counsel for
the Company.

         (d) I am aware of the  provisions  of Rule 144,  promulgated  under the
Securities  Act,   which,  in  substance,   permits  limited  public  resale  of
"restricted  securities"  acquired,  directly  or  indirectly,  from the  issuer
thereof (or from an affiliate of such  issuer),  in a  transaction  or series of
transactions not involving a non-public offering, subject to the satisfaction of
certain conditions.

         (e) I further understand that at the time I wish to sell the Securities
there may be no public market upon which to make such a sale.

         (f) I further  understand that in the event all of the  requirements of
Rule 144 are not satisfied,  registration  under the Securities Act,  compliance
with Regulation A, or some other  registration  exemption will be required;  and
that,  notwithstanding the fact that Rule 144 is not exclusive, the Staff of the
SEC has expressed its opinion that persons  proposing to sell private  placement
securities  other than in a registered  offering and otherwise  than pursuant to
Rule 144 will  have a  substantial  burden  of  proof  in  establishing  that an
exemption from registration is available for such offers or sales, and that such
persons and their respective  brokers who participate in such transactions do so
at their own risk.

                                             -----------------------------------
                                                      Name of Purchaser

                                             -----------------------------------
                                                            Date

                                      E-58

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00017-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00017-of-00352.parquet"}], [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00017-of-00352.parquet"}], [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00017-of-00352.parquet"}], [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00017-of-00352.parquet"}]]