Uniswap v4 becomes an aggregator as hooks go live on 3 chains

Uniswap Labs has switched on "aggregator hooks", letting Uniswap v4 route trades through liquidity held on other exchanges, the company said on Thursday. The feature is live in the Uniswap web app and API on Ethereum mainnet, Base and Robinhood Chain, with more networks planned.

What changed

Until now, a swap on Uniswap drew mainly on Uniswap's own pools. Specialised aggregators such as 1inch or CowSwap existed to compare prices across many venues. Uniswap is now building that step into the protocol itself:

• Seven external sources are connected at launch. Uniswap names Curve, Fluid, PancakeSwap V3, Slipstream, Uniswap v2/v3 and their forks, and LitePSM among them and says they cover more than 90% of DEX activity on these chains.
• Web app users get the extra routes automatically; developers can reach them through the Uniswap API.
• The first aggregator hook went live in March on Tempo, the payments chain from Stripe and Paradigm, but there it works only in the web app, The Block reported.

How the hooks work

Hooks are add-on contracts introduced with Uniswap v4 that let developers attach custom logic to a pool. An aggregator hook wraps an outside liquidity source so it looks like a normal v4 pool. Every block, Uniswap's router pulls fresh quotes from those sources, then builds the cheapest route across Uniswap pools and external venues. The whole route settles in one transaction, and users do not have to approve anything new.

Why Uniswap is doing it

Uniswap says it has handled more than $4.5 trillion in cumulative volume and already holds most on-chain liquidity, but new liquidity keeps forming elsewhere. Pulling it in keeps order flow on Uniswap. There is also a token angle: swaps routed through outside sources pay Uniswap protocol fees, which contribute to UNI burns. The plan first appeared in the "UNIfication" proposal in November 2025, and fee-driven revenue has been rising, as we covered in Uniswap's record September.

What it means for users

For traders, the practical effect should be better prices on larger swaps without leaving the Uniswap app. The usual DeFi caveats still apply: you trade from your own wallet, and each extra protocol on a route is extra smart-contract risk. Our explainers on what DeFi is and centralized vs decentralized exchanges cover those trade-offs, and layer-2 networks explains what Base and Robinhood Chain actually are.