Uniswap Initiates Temperature Check to Enable Protocol Fees in v4 Pools Across 11 Chains

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According to Uniswap Labs, the protocol initiated a temperature check proposal on July 7 to enable protocol fees in v4 pools. The proposal, following the UNIfication-approved expedited governance process, will enter a five-day Snapshot voting phase starting today, followed by on-chain voting beginning July 13. The proposal introduces the V4FeeController system, comprising two core contracts: V4FeePolicy calculates fees based on governance rules, while V4FeeAdapter enforces governance overrides and collects fees to TokenJar. Fees are determined hierarchically by pool family, checking specific trading pair rates first, then family default rates, and finally global default rates. The proposal activates fees for three pool families across 11 chains including Ethereum, Arbitrum, Base, and BNB Chain: static fee pools without Hooks, CCA pools post continuous clearing auctions, and aggregator Hook pools. Aggregator Hook pools default to 10 basis points for non-Base chains and 3 basis points for Base, with reduced rates for stablecoin pairs. All collected fees flow into each chain's TokenJar.
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