Polymarket Resumes Trading After Third-Party Provider Breach

Polymarket resumed trading on its international platform on October 29 after temporarily halting new activity in response to a reported compromise of a third-party provider. The company said the issue had been fixed, referred to law enforcement and promised to reimburse traders affected by the incident. It did not confirm how many users were affected or the total losses. Polymarket’s status history records a major outage affecting its Predictions Trading API from 18:05 to 19:05 UTC. The company said the provider compromise was fixed at 18:37 UTC. During the interruption, users could cancel existing orders but could not place new ones; the platform also paused relay activity, which facilitates customer blockchain transactions. The outage was marked resolved at 19:05 UTC. Estimates of the funds involved have come from blockchain analysts and other observers, not an official loss report from Polymarket. Figures cited in reports ranged from about $2.65 million to roughly $2.7 million. Those estimates have not been confirmed by the company, which has also not disclosed the number of affected traders or how much it expects to reimburse. Researchers at Hudson Rock examined a...