Polymarket Halts Trading After Vendor Hack

Polymarket halted international trading Thursday after a UK-based vendor breach drained roughly $2.7 million from 700 users. The company promised refunds and notified British authorities while suspending new orders. This incident follows a June 2026 breach causing over $2 million in losses. Hudson Rock identified attacker wallet 0x3F99139F1C5854bb628c2e576Aaf638e99dFfc18 which held approximately $2.19 million in cryptocurrency at investigation time.