Polymarket Halted International Trading After Hackers Drained Accounts
Polymarket halted trading on its international platform while investigating a breach at a UK-based third-party vendor. The incident matters because traders’ accounts were drained, though the company said it would refund those affected and that its US platform was not impacted.
Blockchain analytics firm Bubblemaps estimated that about 700 users lost approximately $2.7 million. UK law enforcement was notified, and trading was paused for several hours. Polymarket operates a cryptocurrency-based international market and a separate federally regulated US exchange; the international platform also suffered a breach in June 2026, causing more than $2 million in losses.
In short
- A breach at a UK vendor affected Polymarket’s international platform.
- About 700 users may have lost $2.7 million.
- Polymarket says affected traders will be refunded.
Explained simply
Polymarket is a platform where people trade using cryptocurrency on the outcomes of future events. It has an international service and a separate US exchange, which is federally regulated and operates under different rules.
The international service relies on outside companies to provide some technology. A breach involving one of those suppliers can put users’ accounts at risk, even if the supplier does not run the market itself.
The incident is significant because digital assets can be transferred quickly, and losses may be difficult to recover. A previous breach at the international platform also led to losses, while the company’s two services have different regulatory arrangements.
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