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Polymarket halts trading after $2.65 million hack, cites breach at external partner

Prediction market platform Polymarket temporarily halted trading after more than $2.6 million in funds was drained within minutes, The Block reported on Oct. 29. Polymarket switched its exchange to a cancel-only mode, allowing users to cancel existing orders but not place new ones or execute trades. It also suspended its relayer function while investigating. Arkham data showed a suspected attacker wallet holding about $2.65 million worth of POL.