Polymarket reports internal wallet key exposure; $520,000–$700,000 drained on May 22

Polymarket said a security incident on May 22 led to roughly $520,000–$700,000 in crypto being siphoned from an internal operations wallet, while user funds and core smart contracts were not affected. The activity was flagged after large outflows on Polygon (POL), with reports of about 5,000 POL withdrawn every 30 seconds from addresses tied to its UMA CTF Adapter. The team said it rotated keys and later recovered about $164,000 while trading and market resolutions continued normally.