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Polymarket resumes trading after third-party security breach, to reimburse users

Polymarket said it will reimburse affected traders after malicious code drained wallets and forced a brief trading halt on its international platform.

  • On Thursday, Polymarket halted trading on its international platform for nearly an hour after malicious code served through its website caused users to report losing more than $2 million.
  • DebugBear, a UK-based analytics company, confirmed it is aware of the 'ongoing security incident' after its code was exploited to gather trading credentials from user local storage.
  • Blockchain analysis group Arkham reported some $2.65 million in cryptocurrencies were siphoned from the platform before trading resumed at 3 p.m. ET.
  • Polymarket pledged to 'make whole' any impacted users and has referred the matter to relevant law enforcement, the company said.
  • Head of global intelligence and investigations Shana Bautista noted the company is investigating 'dozens' of issues related to the U.S. midterms as prediction markets face continued insider-trading threats.
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Crypto Briefing broke the news on Thursday, October 29, 2026.
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