Uniswap Labs has launched StablePair Hook, a Uniswap v4 tool that sets liquidity-provider fees dynamically for two stable-pair pools on Ethereum rather than charging one constant rate.
The launch covers USDC/USDT and USDC/USDG. For liquidity providers, the material change comes when a pool moves away from its expected rate: corrective trades outside a configured price band are auctioned through a fee that falls each block, allowing the pool to retain part of the arbitrage opportunity as fee revenue.
A fixed-fee stable-pair pool charges the same percentage when its assets are near parity and when they have moved apart. Uniswap’s stated tradeoff is that a low fee leaves more of the corrective spread to arbitrageurs, while a high fee can make the pool’s quotes uncompetitive.
StablePair configures each pool with a reference rate and a narrow band around it. The hook sets the LP fee from the pool price, its distance from the reference rate and the direction of the proposed trade.
Inside the band, the fee changes to maintain consistent pre-price-impact buy and sell quotes. At the reference rate, both directions pay the configured band width. Near an edge, the fee for a trade moving toward that edge falls toward zero, while the fee in the opposite direction rises toward roughly twice the band width.
