What to know : Blockchain sleuth ZachXBT flagged a suspected security breach at Polymarket in which more than $520,000 was drained from two smart contracts on the Polygon blockchain. Polymarket developers said the incident stemmed from a private key compromise of an internal operations wallet tied to its rewards payout system, stressing that user funds and market resolutions remain safe.
Blockchain investigator ZachXBT has highlighted a suspected security breach involving Polymarket, the world’s largest decentralized prediction market platform.
Over $520,000 was reportedly drained from two smart contracts on the Polygon blockchain, according to on-chain data shared by ZachXBT. The affected addresses are 0x871D7c0f9E19001fC01E04e6cdFa7fA20f929082 and 0x91430CaD2d3975766499717fA0D66A78D814E5c5, with funds allegedly sent to attacker address 0x8F98075db5d6C620e8D420A8c516E2F2059d9B91.
A Polymarket developers said the company is aware of reports tied to its rewards payout system in a post on X. The team emphasized that user funds and market resolutions remain safe, describing the issue as a private key compromise of an internal operations wallet rather than a broader smart contract exploit or core infrastructure breach. Further updates are expected.
Polymarket has not yet issued an official statement from its main X account. CoinDesk has reached out to the company for additional comment. The incident comes amid heightened scrutiny of decentralized finance platforms.
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