The world’s largest decentralized prediction market platform, Polymarket, suffered a security incident that resulted in the loss of approximately $520,000 to $700,000 in cryptocurrency.
In this line, Blockchain investigator ZachXBT first highlighted the suspicious activity on May 22 after noticing large outflows from contracts linked to the platform on the Polygon (POL) blockchain.
The incident involved rapid withdrawals, with reports indicating that an attacker drained around 5,000 POL tokens every 30 seconds from addresses associated with Polymarket’s UMA CTF Adapter.
Polymarket exploit transfers. Source: Arkham
The adapter serves as a key integration for market settlement through UMA’s Optimistic Oracle system. Funds, primarily in USDC and POL, flowed to an attacker-controlled address beginning with 0x8F98. The systematic nature of the drains suggested the use of an automated script.
Polymarket responded swiftly, with the team clarifying that the breach did not st
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