Uniswap Labs announced the launch of StablePair Hook, a dynamic-fee hook built for Uniswap v4 and designed for stable pairs - examples cited include USDC/USDT and wrapped-asset pairs such as WBTC/cbBTC. The feature is operational on Ethereum mainnet with two live pools: USDC/USDG and USDC/USDT.
Stable pairs are among the most actively traded markets in decentralized finance. On the Uniswap Protocol, stablecoin-to-stablecoin swaps alone totaled $43.4 billion in the second quarter of 2026, a volume greater than the next three onchain venues combined. That trading concentration informs the design choices behind StablePair Hook.
How the mechanism works
StablePair Hook replaces a single, static fee rate with a dynamic fee that is computed on every swap. The hook measures the pool's deviation from a defined reference price - the true rate around which a stable pair typically trades - and sets the fee to correspond with that measured drift.
The mechanism has three operating modes described by Uniswap Labs:
- Within a tight band around the reference rate, the fee is adjusted on each swap to maintain a consistent quoted bid/ask spread.
- If the pool price drifts outside that band, swaps that push the price further away from parity pay no fee, effectively providing the pool with a favorable starting price.
- Trades that restore the price from outside the band are executed through a Dutch auction: the fee begins high and falls each block until a participant accepts it. Liquidity providers retain the difference generated by that auction.
By tailoring fees to price drift, the hook aims to alter how value from reprice events is distributed among arbitrageurs, traders, and liquidity providers. The approach seeks to mitigate the trade-offs presented by fixed fees - low static fees can leave the spread to arbitrage bots, while high static fees can push a pool's quoted price away from parity.
Governance and evolution
StablePair Hook is designed to evolve. Pool parameters and the fee logic are upgradeable through Uniswap Governance, enabling iterative improvements to the mechanism without requiring pools to migrate. Uniswap Labs is developing hooks in collaboration with issuers and liquidity providers and is open-sourcing the code so teams can begin from working implementations. StablePair Hook joins previously released hooks such as DualPool, Permissioned Pools, and LitePSM, with additional hooks on the roadmap.
Market structure context
The Uniswap automatic market maker architecture opened decentralized finance to a wide range of assets, and hooks extend the protocol's flexibility by allowing individual pools to specify bespoke rules for pricing and fees. For market participants - including liquidity providers and traders - StablePair Hook represents a change in how fee income, reprice capture, and order execution are handled within stable pairs.
About Uniswap Labs
Uniswap Labs is a core contributor to the Uniswap Protocol, the world’s largest decentralized exchange by trading volume, which has processed more than $4.6 trillion in volume. Uniswap Labs also builds products that help users access the protocol, including the Uniswap Web App, Wallet, and Uniswap API.
Reporter: Nina Shah
Nina Shah covers financials and analyzes product developments that affect market structure, underwriting quality, and provider economics.