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

The company said it will reimburse affected traders after a compromised vendor let malicious code drain wallets and forced a temporary trading halt.

  • 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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Lean Right

The Polymarket prediction platform, which indicates Calin Georgescu as the favorite in the presidential race in Romania, was targeted for a computer attack. One account lost at least $2.7 million, and the money was transferred to 710 digital wallets. The Polymarket, the platform that gave Calin Georgescu the favorite at the presidential, was attacked by hackers. An account would have withdrawn $2.7 million first appeared on Romania TV.

Lean Left

At least $2.6 million disappeared from user accounts on Polymarket last night after hackers exploited a technical flaw on the platform's website.

·Zagreb, Croatia
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Lean Left

Hackers have siphoned off at least $2.6 million from users of the forecasting platform Polymarket, The Wall Street Journal reports. The funds were transferred to a crypto wallet linked to the attackers in more than 900 transactions. The attack took place on October 29. According to an analysis of blockchain data cited by the American newspaper, the wallet received more than $2.5 million from user accounts. Arkham data shows that it held assets w…

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The Business Journal broke the news on Thursday, October 29, 2026.
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