Exhibit 31.2

**CERTIFICATION**

| I, Glenn Barrett, certify that: |
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| 1.                              | I have reviewed this quarterly report on Form 10-Q of 724 Solutions   Inc.; |
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| 2.                              | Based on my knowledge, this report does not contain any untrue   statement of a material fact or omit to state a material fact necessary to   make the statements made, in light of the circumstances under which such   statements were made, not misleading with respect to the period covered by   this report; |
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| 3.                              | Based on my knowledge, the financial statements, and other financial   information included in this report, fairly present in all material respects   the financial condition, results of operations and cash flows of the   registrant as of, and for, the periods presented in this report; |
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| 4.                              | The registrant’s other certifying officers and I are responsible for   establishing and maintaining disclosure controls and procedures (as defined   in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have: |
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|                            | a) | Designed such disclosure controls and procedures, or   caused such disclosure controls and procedures to be designed under our   supervision, to ensure that material   information relating to the registrant, including its consolidated   subsidiaries, is made known to us by others within those entities,   particularly during the period in which this report is being prepared; |
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|                            | b) | Evaluated the effectiveness of the registrant’s disclosure controls   and procedures and presented in this report our conclusions   about the effectiveness of the disclosure controls and procedures, as of the   end of the period covered by this report based on such evaluation; and |
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|                            | c) | Disclosed in   this report any change in the registrant’s internal control over financial   reporting that occurred during the registrant’s most recent fiscal quarter   that has materially affected, or is reasonably likely to materially affect,   the registrant’s internal control over financial reporting; and |
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| 5.                              | The registrant’s other certifying officers and I have disclosed,   based on our most recent evaluation of internal control over   financial reporting, to the registrant’s   auditors and the audit committee of the registrant’s board of directors (or   persons performing the equivalent functions): |
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|                            | a) | All significant deficiencies and material weaknesses in the design or   operation of internal control over financial reporting which are reasonably likely to adversely affect   the registrant’s ability to record, process, summarize and report financial   information; and |
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|                            | b) | Any fraud, whether or not material, that involves management or other   employees who have a significant role in the registrant’s internal   control over financial reporting. |

Date:  August 12, 2005

|   | /s/   GLENN BARRETT                         |
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|   |                                             |
|   | Glenn   Barrett                             |
|   | Chief   Financial Officer and               |
|   | Senior   Vice-President, Corporate Services |