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Polymarket resumes trading after third-party security breach, to reimburse users

By Thomson Reuters Oct 29, 2026 | 1:36 PM

Oct 29 (Reuters) – Polymarket said on Thursday it had restored trading after a temporary halt prompted by a ​security incident involving a third-party ‌provider, and that it would fully reimburse affected traders.

The prediction market operator said in a post on X that it had identified and ‌fixed ​the issue. It earlier ⁠halted trading as ⁠a precaution while it worked to bring the platform back online.

It had referred the incident to UK law enforcement.

A ​source familiar with the matter identified DebugBear as the third-party provider involved ⁠in the Polymarket incident.

DebugBear, ⁠a website performance monitoring and ​debugging platform, said in a post on ​X that it was affected by ‌an ongoing security incident and urged customers using its RUM product to remove the embedded code from their websites.

Prediction ⁠markets have surged in popularity, with users increasingly trading contracts tied to outcomes ranging from elections ⁠and ‌sports to financial and geopolitical ⁠events.

Interest in the platforms grew ​during ‌the 2024 US presidential election, ​driving retail ⁠engagement and trading activity, while financial institutions are increasingly seeking exposure to event-driven trading.

(Reporting by Prakhar Srivastava in Bengaluru and AJ Vicens; Editing by Pooja Desai and ​Maju Samuel)