Polymarket resumes trading after third-party security breach

Following a security incident involving third-party provider, Polymarket has resumed trading after temporarily suspending its international service. Trading activities on the platform had been halted on October 29 after reports of unauthorized withdrawals from accounts of some users were received. The company confirmed the occurrence of the incident on its part and said that all affected users of the platform would have their losses compensated. An investigation into the case has been launched by the UK authorities, but the company has refrained from disclosing the exact amount of damages caused by the event. Users report unauthorised withdrawals Several traders reported that funds had disappeared from their accounts without permission. Blockchain analytics firm Bubblemaps estimated that approximately 700 users may have been affected, with losses totalling around $2.7 million. As the reports claim, the compromised third-party vendor has been identified to be DebugBear, which is a service monitoring website performance. DebugBear recognized the security incident and informed its clients using its Real User Monitoring service to remove code associated with the service from their websites. Investigators haven’t disclosed yet how the breach happend and what was the full demage. Polymarket to compensate affected traders The prediction market platform paused its international platform for a time of investigation. Later on Thursday, the trading resumed as company fixed the issue. Affected users would be compensated, although it has not disclosed how many accounts were compromised or how much compensation will be required. The incident reportedly did not affect Polymarket’s separate US platform. Another security incident for Polymarket Another securiy breach happend in June 2026 invlolving Polymarket. An external service provider put hackers in touch with applications used for siphoning away some $3 million of funds from users. The new breach serves to remind users of dangers that come with using such third-party software. Even when the security of the site in question is intact, it does not mean that any software from the outside can’t leak user data. Polymarket has pledged to cover affected traders’ losses, while the investigation into the latest breach continues.