Uniswap Labs launched its StablePair Hook on Ethereum mainnet on September 10, 2026, starting with the USDC/USDG and USDC/USDT pools. The Uniswap v4 feature adjusts trading fees based on how far a stablecoin pool has drifted from its reference rate and whether a swap pushes the price back toward it or further away.
Uniswap Labs rolled out StablePair on Ethereum mainnet on September 10, 2026, a dynamic-fee hook built for pairs of dollar-linked tokens that are meant to trade near the same value but periodically drift apart. The hook ties fees to that drift instead of charging a flat rate on every swap.
StablePair goes live on Ethereum
The first mainnet deployment covers the USDC/USDG and USDC/USDT pools, placing the hook squarely in markets built around liquidity providers pricing tokens near a shared reference rate. Uniswap said stablecoin-to-stablecoin swaps on the platform reached $43.4 billion in the second quarter, exceeding the combined volume of the next three onchain venues by its own count. That figure is Uniswap's comparison, but it explains why the protocol built a fee model specifically for stablecoin pairs rather than treating them as a secondary use case.
Fees move with the reference rate
StablePair's fee depends on two inputs: how far the pool has moved from its configured reference rate, and whether an incoming swap corrects that gap or widens it. Within a narrow price band, the hook charges fees designed to hold a fixed bid/ask spread. Outside that band, the mechanism shifts: it separates trades that push the pool back toward its reference rate from trades that move it further away.
Dutch-auction pricing targets arbitrage
Corrective swaps outside the band face a Dutch-auction-style fee that declines with each block, while trades that widen the deviation pay no fee. The design targets fixed-fee inefficiencies in stablecoin markets, aiming to let liquidity providers capture trading value that might otherwise go to arbitrage traders. Uniswap says the hook's initial rollout stays limited to the USDC/USDG and USDC/USDT pools on Ethereum mainnet.
Source: Crypto Daily™
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