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Some users of Polymarket's international prediction market exchange had funds stolen due to a hack involving a third-party provider, DebugBear. Account holders experienced unauthorized withdrawals totaling at least $2.7 million across 710 wallets. Polymarket's U.S. platform was not affected.

The company halted trading on its international platform on the afternoon of October 28, 2026, and resumed trading at 3:00 p.m. Eastern Time after fixing the issue. Polymarket referred the matter to U.K. law enforcement because DebugBear, the affected website performance monitoring platform, is based in the U.K. DebugBear confirmed a security incident occurred on October 28.

This breach comes days before increased trading volume is expected for the November 3 U.S. midterm elections. Polymarket operates its international exchange as a decentralized finance platform on the polygon blockchain and is not regulated in the U.S. Polymarket pledged to reimburse traders impacted by the hack.

This event highlights risks from third-party providers in decentralized finance platforms. For investors, the reimbursement pledge and Polymarket's rapid response mitigate direct losses, but the total stolen funds reaching $2.7 million underscores vulnerabilities in platform security linked to external services.