ZachXBT flags $520K Polymarket exploit on Polygon, team says funds are safe

Markets Share Share this article Copy link X icon X (Twitter) LinkedIn Facebook Email ZachXBT flags $520K Polymarket exploit on Polygon, team says funds are safe Blockchain investigator ZachXBT has highlighted a suspected security breach involving Polymarket, the world’s largest decentralized prediction market platform. By Omkar Godbole | Edited by Jamie Crawley May 22, 2026, 9:39 a.m. 1 min read Make preferred on ZachXBT flags an exploit at Polymarket. (Boitumelo/Unsplash) 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. Investigations by ZachXBT Polymarket More For You Near Protocol to automate its own growth and its token is skyrocketing By Omkar Godbole | Edited by Jamie Crawley 48 minutes ago Near Protocol will introduce dynamic resharding in June, allowing the blockchain to automatically add shards as demand grows without human intervention. What to know : Near Protocol will introduce dynamic resharding in June, allowing the blockchain to automatically add shards as demand grows without human intervention. The upgrade aims to boost scalability for an AI-driven on-chain economy while also adding post-quantum-safe signing to protect users from future quantum-computing threats. NEAR’s token has surged nearly 30%... Read full story Latest Crypto News Near Protocol to automate its own growth and its token is skyrocketing 48 minutes ago Polymarket aims for prediction market approval in Japan by 2030 1 hour ago Bitcoin implied volatility drops to 7 month low despite macro risks 1 hour ago XRP ETFs attract inflows amid wallet surge. bitcoin, ether funds struggle. 3 hours ago Bitcoin trades near $77,700 as analysts eye $75,000 support after liquidation wave 4 hours ago India cracks down on prediction markets: Polymarket goes dark, Kalshi could be next 4 hours ago Top Stories U.S. CFTC secures deal with National Hockey League on prediction market safeguards 18 hours ago Mark Cuban says he sold most of his Bitcoin after failed hedge narrative 'disappointed' the billionaire 16 hours ago Ethereum’s identity crisis is deepening after high-profile 'brain drain' frustrates the community 16 hours ago Satoshi’s 1.1 million bitcoin and millions more can be saved from quantum attack, says expert 14 hours ago Blockchain.com files with SEC for U.S. IPO 19 hours ago Binance launches SpaceX pre-IPO perps amid $2 trillion valuation bets May 21, 2026