0x Warns Of Aggregator Quote Spoofing Via Univ4 Hooks

0x Project warned that an alarming surge of malicious Uniswap v4 hooks are actively manipulating quotes to steal from traders across DeFi aggregators, wallets, and trading interfaces. 0x conducted an analysis of 84,163 hooks across six networks using static, dynamic, and settlement-level trade observation. It determined that only 19.4% of hooks are safe, while 54.2% are malicious and another 26.4% are likely malicious.

Bad actors can leverage v4 hooks to display tight quotes to aggregator routing engines, only to then alter pricing parameters or inject punitive fee spikes at trade execution. 0x says these spoofing tactics inspect the EVM execution environment or randomly alternate parameters, causing settled trades to deliver as much as 50% less capital than originally quoted.

The team documented live hooks charging hidden fees as high as 18% on active pairs, extracting hundreds of thousands of dollars from users with loose slippage tolerance settings. 0x warns that routers and interfaces must implement strict execution-behavior verification and rapid removal controls. Uniswap recommends using the Uniswap API, which only includes vetted hooks.

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