Polymarket attributes trading suspension to a third-party security incident

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Polymarket suspended trading on its international platform after a third-party service provider was breached, saying it has fixed the issue, will compensate affected users, and has referred the incident to law enforcement. During the investigation, the platform switched to cancel-only mode, prohibiting new buy and sell orders while allowing existing orders to be canceled, and also suspended relayer actions. On-chain activity shows that a suspected attacker wallet received more than $2.5 million from user accounts, involving more than 900 transactions. Trading is expected to resume at around 3 p.m. ET on Thursday.