Uniswap Labs Deploys Dynamic Fee Hook for Stablecoin Pools

Uniswap Labs, a key contributor to the Uniswap decentralized exchange, has launched a new feature called StablePair Hook for its v4 protocol. The new tool introduces a dynamic fee structure for trading pairs of stable assets, such as USDC/USDT, and is now live on the Ethereum mainnet with two initial pools.

A New Fee Mechanism

Stablecoin pairs, which trade around a fixed rate, represent a significant portion of decentralized finance (DeFi) activity. According to Uniswap Labs, stablecoin-to-stablecoin swaps on its protocol alone reached $43.4 billion in the second quarter of 2026. The StablePair Hook aims to replace the traditional static fee model, which can lead to value being captured by arbitrage bots rather than liquidity providers (LPs).

The new hook dynamically adjusts fees based on how far a pool's price has drifted from its target peg. On every swap, the mechanism measures this deviation and sets the fee accordingly. This is designed to allow LPs to retain more of the value generated from rebalancing the pool.

The system operates with several rules:

Ad

• Within a narrow band around the target price, the fee adjusts to offer a fixed bid/ask spread.
• If the price moves outside this band, swaps that push it further away from the peg incur no fee.
• Swaps that help correct the price back towards the peg from outside the band enter a Dutch auction, where the fee starts high and decreases with each block until a trader accepts it.

Market Context and Future Development

The introduction of StablePair Hook is part of a broader strategy for Uniswap v4, which uses "hooks" to allow for greater customization of liquidity pools. This enables developers to create pools with unique rules, fee structures, and pricing logic. Other hooks developed by Uniswap Labs include tools for permissioned pools and a lite-PSM (Peg Stability Module).

Uniswap Labs stated that the new hook is designed to evolve. The pool's parameters and fee logic can be upgraded over time through Uniswap's governance process, allowing the mechanism to be refined without requiring liquidity to migrate to new pools. The initial deployment includes pools for USDC/USDG and USDC/USDT.