Uniswap launches a stable pool fee that rises and falls with the price gap

Uniswap Labs has launched StablePair Hook on Ethereum mainnet, introducing a dynamic fee structure for stablecoin trading pairs that adjusts in real time based on how far a pool's price drifts from its reference rate. The feature went live on September 10, 2026, with initial pools covering USDC/USDT and USDC/USDG.

How the fee mechanism works

StablePair Hook uses a dynamic fee rate instead of a fixed one, adjusting based on how far the pool price deviates from a reference price. When the price remains near that reference, the hook adjusts the fee for each transaction to maintain a fixed spread between the bid and ask prices. If the price moves outside this range, trades that push the deviation further pay no fees, as they effectively provide a more favourable price to the liquidity pool.

Trades that move the price back toward the reference rate use a Dutch auction. The fee starts high and falls with each block until a trader accepts it, which Uniswap Labs says allows liquidity providers to keep more of the value from bringing the price back. The design is a direct challenge to the arbitrage bots that have traditionally captured that corrective spread at the expense of LPs.

StablePair Hook is Uniswap Labs' latest v4 hook and its first upgradeable dynamic-fee hook. Pool parameters and fee logic can be changed through Uniswap governance without requiring liquidity to migrate to a new pool. StablePair Hook joins DualPool, Permissioned Pools, and LitePSM, with more on the roadmap.

A large and growing market

Stablecoin-to-stablecoin swaps on @Uniswap reached $43.4 billion in the second quarter of 2026, more than the next three onchain venues combined, according to Uniswap Labs. That scale helps explain the strategic priority: with stablecoin volume at this level, even a marginal improvement in how fee revenue is distributed can translate into meaningful gains for LPs.

By early September 2026, over 90,000 hook instances had been initialised across the Uniswap v4 ecosystem, reflecting how quickly developers have adopted the protocol's programmable pool architecture since v4 launched. Uniswap Labs describes the Uniswap Protocol as the world's largest decentralised exchange by trading volume, having processed more than $4.6 trillion in total volume.

Sources
The Block: Uniswap launches StablePair Hook to help LPs capture more stablecoin trading value
Uniswap Labs official press release via Bitcoin Ethereum News