Polymarket replaces exposed private key after $600,000 outflow

Polymarket replaced an exposed private key after approximately $600,000 left its wallets, the crypto-native prediction market platform said Friday. The company confirmed user funds were unaffected and that it conducted a security review following the incident. Protos reported the exploit at $700,000. The breach targeted private keys, a critical vulnerability for blockchain-based operations, and came as Polymarket pursues regulatory legitimacy and broader adoption. The key replacement marks the firm's response to a security incident that triggered scrutiny of its custody infrastructure. The event followed earlier reports of a legacy private key leak and production permission revocations, indicating an ongoing security remediation effort across the platform's wallet architecture.