Polymarket attack via a third-party provider: what users should watch now

Polymarket temporarily halted trading on its international platform on October 29, 2026, after users reported unauthorized withdrawals. The attack ran through an external service provider that gave the attackers a way into accounts. The platform's trading contracts themselves were not affected. The company reopened trading the same day and promised full reimbursement to everyone affected. For users in Germany, the incident shifts the question. The key issue is not whether a trading contract on the blockchain has been cleanly programmed.