Polymarket suspended all trading on its international venue on Thursday, October 29, 2026, after a third-party service provider was compromised, with users reporting that they had seen their accounts drained.

According to the company's status page, the issue affecting Polymarket.com has been identified and fixed. The company attributed the disruption to the compromised third-party provider — an outside dependency whose compromise was enough to halt trading across the entire international venue, underscoring how platform availability can rest on vendors beyond the exchange itself.

Polymarket is a crypto-denominated prediction market that allows users to trade on the outcomes of real-world events such as elections, sports, and economic data releases. Positions are priced between $0 and $1 and typically settle in the USDC stablecoin, with payouts determined by actual event outcomes. That settlement structure raises the stakes of any trading halt: until markets reopen, holders of open positions cannot add to or exit trades even as the real-world events they track continue to unfold. The platform drew broad mainstream attention during the 2024 U.S. presidential election cycle and operates venues tailored to different regions, with its international site hosted at Polymarket.com.

As of the initial report, the compromised provider had not been named and the full scope of the drained user accounts had not been detailed, making those specifics — along with confirmation that trading across Polymarket.com has fully resumed — the immediate developments to watch.

This report was first published on COINOTAG: https://en.coinotag.com/polymarket-halts-trading-third-party-breach