Polymarket resumes international trading after fixing third-party security breach
Polymarket resumed trading on its international platform October 29, 2026, after halting activity due to a compromised third-party provider. The company identified and fixed the security issue and said it will reimburse affected users. The breach involved hackers stealing user funds through the third-party service. No reimbursement amount, scope of stolen funds, or identity of the third party was disclosed. The company's CFTC-regulated US venue operated through QCX LLC was not affected.
Polymarket's quick restart and reimbursement pledge steer trader attention toward its response speed rather than dwell on the breach itself. Competitors Kalshi and ForecastEx had a narrow window to poach shaken users; that window closes as positions reopen. The reimbursement commitment tests Polymarket's treasury and sets a benchmark that rivals will face in future incidents.
Third-party providers remain a weak point even for platforms with audited smart contracts. The shared Polymarket brand means trust damage on the international site still touches the regulated US venue. Each breach response shapes whether traders view the brand as resilient or risky.
Polymarket's second platform halt and restart in under 24 hours follows its earlier freeze over suspicious election trades, showing the international platform weathering sequential operational shocks while the separate CFTC-regulated US venue remains untouched.