Polymarket's international trading platform has resumed operations after a hack that compromised trader wallets. The breach targeted a third-party vendor in the UK, not the prediction market's website directly. UK law enforcement has been informed of the incident. Trading was temporarily halted for investigation, during which time traders reported significant financial losses. Blockchain analytics suggest around 700 users lost approximately $2.7 million. Polymarket has stated it will refund affected traders. The hack did not affect users on the separate Polymarket US platform. Polymarket US is a regulated exchange, while the flagship platform is crypto-based and banned in some regions. This is not the first security incident for Polymarket, with a similar vendor attack in June causing substantial losses. Separately, a large amount of cryptocurrency was drained from Binance wallets shortly before Polymarket halted trading.