Polymarket halts trading after hackers breach third-party vendor

Summarised from 2 outlets · Updated 29 Oct, 23:38 · Archive

Polymarket suspended trading on its international platform after hackers compromised a third-party provider, affecting around 700 users and approximately $2.7 million.

Polymarket temporarily suspended trading on its international platform after a third-party vendor was compromised in a security incident. Wired reports that around 700 users were affected, with approximately $2.7 million stolen. The exact scope of the breach was initially unclear; The Guardian noted that it was not immediately apparent to what extent traders were affected.

Both outlets report that the breach did not impact Polymarket US, the company's platform for United States users. Reports linked the source to DebugBear, a UK-based website performance-monitoring tool. DebugBear's own website became unavailable on Thursday afternoon and the company advised clients to remove its embed code from their websites.

Trading was paused for about an hour and resumed on Thursday afternoon. Polymarket said it halted trading "out of an abundance of caution" after identifying and fixing the issue. The company promised to fully reimburse all affected traders and reported the incident to UK law enforcement. This is not the first time Polymarket traders have experienced security issues; Wired reports the platform experienced another breach in June 2026 that resulted in over $2 million in losses.

How it is being reported

• Polymarket temporarily suspends trading on international platform due to security incidentSecurity incident linked to performance-monitoring tool spurred platform to halt trading for about an hour Polymarket temporarily halted trading on its international platform on Thursday because of a security incident that compromised a third-party provider, the company said. Trading was paused for about an hour and resumed on Thursday afternoon. The company has promised to fully reimburse any affected traders. Continue reading...The Guardian · 29 Oct, 23:20
• Polymarket Halted International Trading After Hackers Drained AccountsThe company says an unnamed third-party provider was compromised. Trading has resumed, and Polymarket says affected traders will be made whole.Wired · 29 Oct, 19:51

In this story: Polymarket · DebugBear · United Kingdom

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