Uniswap launches a temperature check for v4 protocol fee activation, introducing a tiered fee controller system

ChainCatcher reports, according to official information, Uniswap Labs has released a temperature check proposal to enable protocol fees in v4 pools. This proposal follows the previously approved UNIfication fast governance process and will go directly into a five-day Snapshot vote, followed by an on-chain vote.

Because the Hook architecture of v4 makes fee settings more complex than v2/v3, the proposal introduces a V4 Fee Controller system, which includes two core contracts: V4FeePolicy, which calculates fees for any pool according to governance rules, and V4FeeAdapter, which executes governance overrides and collects fees into the TokenJar. Fees are calculated in tiers based on the pool's family: governance-set specific pair fee rates are checked first, followed by the default fee rate for that family, and finally the global default rate.

This proposal intends to activate fees for three types of pool families on 11 chains including Ethereum, Arbitrum, Base, and BNB Chain: static fee pools without Hook, CCA pools after continuous clearing auctions, and aggregator Hook pools. Fee rates for aggregator Hook pools will be adjusted by a 25x multiplier, with a default of 10 bp on non-Base chains (3 bp for stablecoin pairs), and 3 bp on Base chain (1 bp for stablecoin pairs). All fees will flow into each chain’s TokenJar, and the amount of UNI burned on L2 and Alt-L1 will be bridged to Ethereum mainnet and sent to the 0xdead address.