Polymarket said findings point to a possible private key compromise tied to an internal top-up wallet on Polygon.

Onchain sleuth ZachXBT flagged a potential exploit of Polymarket's UMA CTF Adapter on Polygon, with $520K reportedly drained so far.

ZachXBT said that Polymarket’s UMA smart contract has been exploited for at least $520,000, pointing to an attacker address receiving hundreds of small transactions.