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Polymarket hacked for $700K via rewards system breach, user funds reportedly safe

Pluang • May 22, 2026

Prediction markets transform future event uncertainty into tradable contracts but depend heavily on oracles to verify outcomes onchain. Chainlink provides broad oracle infrastructure for objective data, Pyth specializes in fast financial price feeds,...

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Polymarket Suffers $520K Loss from Private Key Compromise On May 22, 2026, Polymarket experienced a security incident resulting in over $520,000 drained from its UMA Conditional Token Framework (CTF) Adapter on the Polygon network. Blockchain investigator ZachXBT flagged suspicious outflows, leading to the discovery that an internal operations wallet's private key had been compromised. The attacker siphoned approximately 5,000 POL tokens every 30 seconds, but Polymarket confirmed that no user funds or core smart contracts were affected. The breach highlights operational security vulnerabilities rather than technical flaws in the smart contracts. Polymarket is currently investigating the incident and has initiated key rotation procedures to enhance security. The exploit has raised concerns about the overall safety of decentralized finance (DeFi) platforms, particularly regarding private key management. 13 sources 52

Polymarket hacked for $700K via rewards system breach, user funds reportedly safe

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Extracted Entities

Attack Types (1)

Companies (1)