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Polymarket said a third-party provider was compromised in a security incident on 29 October, and that affected users would be reimbursed. The platform briefly suspended event-contract trading while addressing the incident, then resumed it; it did not confirm the total funds taken or number of affected accounts.

Polymarket said it would reimburse users whose funds were taken in a security breach on 29 October, after a third-party provider was compromised. The company confirmed the incident and said it had referred the matter to the police. In a post on X, the company's official profile said: "Qualquer pessoa que tenha sido afetada será totalmente ressarcida".