Polymarket Halts Trading Following Third-Party Compromise
Polymarket suspended trading on its international venue on Thursday after a security breach involving a third-party provider led to unauthorized withdrawals from user accounts. According to Nikhilesh De at CoinDesk, the prediction market platform confirmed the compromise after users on the social media site X reported seeing their balances drained without their approval.
The incident prompted Polymarket to immediately restrict new buy and sell orders and pause relayer actions to prevent further losses. However, users retained the ability to cancel existing orders, as reported by The Defiant Team at The Defiant. The same report noted the severity of the exploit, highlighting that at least one trader experienced an $800,000 account drain during the incident.
Attacker Wallet and Platform Response
Blockchain data quickly revealed the scale of the unauthorized transfers. As reported by Jose Antonio Lanz at Decrypt, Arkham Intelligence data linked a suspected attacker wallet to approximately $2.65 million in stolen POL tokens.
Polymarket has since announced that the vulnerability has been patched. In a statement posted to its status page, the company declared, "We have identified and fixed the issue impacting our international platform. One of our third party providers was compromised, and we have referred this to relevant law enforcement."
Furthermore, The Defiant Team at The Defiant reported that the platform has officially pledged to make all affected users whole. Despite the fix, trading remained temporarily halted while the company worked on comprehensive service restoration efforts.
For traders evaluating platform risks in the wake of this exploit, the incident underscores the importance of utilizing the best Polymarket tools to monitor account security and track third-party wallet approvals. As the prediction market industry matures, robust security infrastructure remains a critical differentiator when comparing Kalshi vs Polymarket, especially as both platforms now handle billions of dollars in trading volume.