Polymarket International Platform Hit by Vendor Breach on Oct. 29: About $2.6–2.7 Million Drained, Trading Restored, Users to Be Reimbursed
Prediction-market platform Polymarket's international platform suffered a security incident on October 29: a third-party vendor was compromised, allowing user funds to be drained without authorization. On-chain trackers estimate the outflow at roughly $2.6 million to $2.7 million. The incident is separate from the Binance theft reported the same day, and there is no confirmed evidence linking the two.
According to CoinDesk's October 30 report, Polymarket paused trading on its international platform on the afternoon of October 29 after hackers stole more than $2.6 million from user accounts. The company placed trading into cancel-only mode at 2:05 p.m. Eastern and suspended its trading relayer; at 2:37 p.m. it said an external vendor had been breached, the issue was fixed, the matter had been referred to law enforcement, and affected users would be fully reimbursed. Its status page marked the incident resolved at 3:05 p.m., and trading resumed.
On-chain estimates differ slightly: one tracker saw a suspicious address collect about $2.68 million within an hour, while another estimated about $2.73 million left 737 accounts between 1:10 p.m. and 2:10 p.m. on October 29. Polymarket has not published a final loss total. The company said the incident involved its international platform and should not be read as evidence that its U.S. platform was breached; its smart contracts were untouched, and funds were moved after the compromised third-party script read login credentials and trading keys stored in browsers. The reimbursement pledge is still being carried out, and final figures await the company's formal announcement and the law-enforcement investigation.
Source: GSM · USA (original Chinese edition)
Photo: 图：加密货币交易示意。1924848uejdjfik 摄，Public domain，经 Wikimedia Commons。 / Cryptocurrency trading on a smartphone (illustrative). Photo by 1924848uejdjfik, Public domain, via Wikimedia Commons.
