Uniswap Labs ships StablePair Hook, a dynamic-fee v4 hook for stablecoin pools

What happened

Uniswap Labs has released StablePair Hook, a Uniswap v4 hook that sets swap fees dynamically on pairs that trade around a known rate, according to CryptoDaily. CryptoDaily reports the hook is built for stable pairs such as USDC/USDT or WBTC/cbBTC and is live on Ethereum mainnet with two pools, USDC/USDG and USDC/USDT. Blockchain.News describes the same launch and lists the initial mainnet pools as USDC/USDT and USDC/USDG.

The mechanism replaces a fixed fee with one recalculated on every swap. CryptoDaily reports that on each trade the hook measures how far the pool has drifted from its true rate, or reference price, and sets the fee to match. Blockchain.News describes the same logic, adding that inside a narrow band around the target price fees are adjusted to maintain a predictable bid/ask spread.

Outside that band the behaviour splits in two directions. CryptoDaily reports that swaps pushing the price further off pay no fee, on the reasoning that they hand the pool a good price to begin with. Blockchain.News gives the same no-fee treatment for trades that widen the deviation. For swaps correcting the price from outside the band, CryptoDaily reports the trade goes through a Dutch auction in which the fee starts high and drops each block until someone takes it, with LPs keeping the difference. Blockchain.News describes the auction the same way, saying fees decline block by block until a trader executes the swap and LPs retain the remaining fee spread.

Both outlets report the hook is upgradeable. CryptoDaily says pool parameters and fee logic can be changed through Uniswap Governance so the mechanism improves without pools needing to migrate; Blockchain.News frames this as letting the community refine parameters and logic over time without migrating liquidity pools.

The numbers

CryptoDaily reports that stablecoin-to-stablecoin swaps on the Uniswap Protocol reached $43.4 billion in the second quarter of 2026, more than the next three onchain venues combined. Blockchain.News cites the same $43.4 billion figure for Q2 2026 stablecoin swaps and the same comparison to the next three on-chain venues.

CryptoDaily reports that the Uniswap Protocol, the largest decentralized exchange by trading volume, has processed more than $4.6 trillion in volume, and that Uniswap Labs is a core contributor to it.

Blockchain.News reports the feature is live as of September 10, 2026.

Context

StablePair is not a standalone product. CryptoDaily reports it joins DualPool, Permissioned Pools and LitePSM, with more hooks on the roadmap, and that Uniswap Labs is building hooks with the issuers and LPs who use them and open sourcing them so teams can start from working code. Blockchain.News lists DualPool and Permissioned Pools as existing hooks, describing DualPool as aimed at market makers and Permissioned Pools at regulated asset trading, and says open sourcing is intended to encourage third-party developers to build custom functionality.

On why a static fee is a problem for stable pairs, CryptoDaily reports that when the price drifts there is value in bringing it back to parity, and a static fee hands most of that to arbitrage bots: set it low and they keep the spread, set it high and the pool prices itself out. Blockchain.News makes the same argument, saying static fee structures left LPs disadvantaged as arbitrage bots captured much of the value created when pools deviated from their target price.

Blockchain.News adds that liquidity providers can move positions into the USDC/USDT or USDC/USDG pools to use the new fee structure, and that traders can reach the pairs through the Uniswap Web App or Wallet. CryptoDaily notes Uniswap Labs also builds the Web App, Wallet and Uniswap API.

Disputed or unconfirmed

The outlets do not contradict each other on the mechanism or the headline volume figures, but several claims rest on a single outlet. The September 10, 2026 live date appears only in Blockchain.News; CryptoDaily says only that the launch is today. LitePSM is listed among existing hooks only by CryptoDaily. The statement that Uniswap v4 launched earlier this year, and the characterisations of what the hook means for slippage, capital efficiency and liquidity depth, come from Blockchain.News alone and are framed there as expectation rather than measured outcome. Neither outlet reports observed fee revenue, volume or LP returns from the two live pools since launch.