Uniswap’s aggregator hooks go live on Ethereum, Base and Robinhood Chain

Uniswap Labs said Thursday that aggregator hooks are now live on Ethereum, Base and Robinhood Chain, allowing Uniswap v4 to route swaps through liquidity that sits on outside platforms instead of relying solely on its own pools.

Fluid, Curve and PancakeSwap are among the external sources connected at launch. The hooks are reachable through the Uniswap web app and the Uniswap API, and the company said support for additional blockchains is planned.

The rollout follows an initial deployment in March 2026 on Tempo, the payments-focused blockchain developed by Stripe and Paradigm. Tempo is currently available only through the Uniswap web app, whereas Ethereum, Base and Robinhood Chain can be accessed through both the web app and the API, a Uniswap Labs spokesperson told The Block.

How the hooks work

Aggregator hooks build on a core feature of Uniswap v4 that lets developers attach custom rules and functions to liquidity pools. In this case, the hook wraps an external venue so that routers treat that liquidity as if it were an ordinary Uniswap pool. Uniswap compares pricing across its own pools and the external sources, then settles the trade in a single transaction.

"Each Aggregator Hook wraps an external source in a Uniswap v4 hook, so that any router sees it as a Uniswap pool," Uniswap Labs said. External sources are included automatically when a user swaps through the web app, while developers calling the API can also direct order flow through the hooks.

Uniswap first outlined the concept in its UNIfication proposal in November 2025, describing the change as turning v4 into an aggregator. Trades routed to external liquidity still pay Uniswap protocol fees, and those fees contribute to burns of the UNI token.

According to Uniswap Labs, the protocol has processed more than $4.5 trillion in cumulative trading volume. The company acknowledged that most onchain liquidity already resides on Uniswap, but said liquidity can still form on other venues, and that aggregator hooks are intended to draw those sources into v4.