Polymarket suspended trading on its international platform on October 29, 2026, after a security incident compromised a third-party provider. The halt lasted approximately one hour before trading resumed that afternoon, The Guardian reported.
The third-party provider involved was a performance-monitoring tool, according to The Guardian. ABC News also reported on the breach, with both outlets confirming the third-party compromise.
Polymarket pledged full reimbursement to any traders affected by the incident, The Guardian said.