Polymarket · X · Llama · CoinDesk
The statement went on to say that users would be made whole, but that platform trading had been halted
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This is the second time in recent months that Polymarket users have lost funds due to a third-party breach.
Key facts
- UPDATE (Oct. 29, 2026, 19:33 UTC): Adds additional detail
- UPDATE (Oct. 29, 19:39 UTC): Updates loss estimate
- According to DeFi Llama, Thursday’s breach came in a hair under that previous total, with some $2.7 million tracked in losses
- In June, Polymarket reported that another third-party vendor had been breached, affecting the company's front-end
Summary
Prediction market provider Polymarket said it had suspended trading after a third-party provider was "compromised," affecting users on the platform's international venue. Polymarket announced the breach on Thursday after users reported seeing their assets withdrawn without their approval on the social media site X (formerly Twitter). "We have identified and fixed the issue impacting our international platform," the statement on its status page said. The statement went on to say that users would be made whole, but that platform trading had been halted.