Uniswap Labs has introduced StablePair Hook, a new Uniswap v4 dynamic-fee hook designed specifically for stable pairs such as USDC/USDT and WBTC/cbBTC. The feature is live on the Ethereum mainnet with two initial pools: USDC/USDG and USDC/USDT.
The launch addresses a central DeFi problem: stable pairs trade around a known rate, but static fees often allow arbitrage bots to capture most of the value when prices drift. According to Uniswap Labs, stablecoin-to-stablecoin swaps on the Uniswap Protocol reached $43.4 billion in the second quarter of 2026, exceeding the combined volume of the next three onchain venues.
StablePair Hook replaces static fees with a dynamic mechanism. On every swap, it measures how far the pool has drifted from its reference price and adjusts the fee accordingly. Within a tight band around the reference rate, the fee updates continuously to maintain a fixed bid/ask spread. If a swap pushes the price further away from the peg, it pays no fee. However, swaps that correct the price from outside the band go through a Dutch auction: the fee starts high and drops each block until a participant executes the trade.
The system is designed to evolve through Uniswap Governance. Pool parameters and fee logic can be upgraded without requiring liquidity providers to withdraw or migrate funds. The StablePair Hook joins other Uniswap Labs hooks, including DualPool, Permissioned Pools, and LitePSM.
Uniswap Labs says the Uniswap Protocol remains the largest decentralized exchange by trading volume, having processed more than $4.6 trillion in total volume.
