Uniswap Labs has launched aggregator hooks on Ethereum, Base and Robinhood Chain, enabling Uniswap v4 to route trades through liquidity provided by external platforms.
Fluid, Curve and PancakeSwap are among the sources available from launch, Uniswap Labs said on Thursday. The hooks can be accessed through the Uniswap web app and API, with support for additional blockchains expected to follow.
The development allows traders to access liquidity held outside Uniswap while completing transactions through the Uniswap v4 system. Ethereum, Base and Robinhood Chain are supported through both the web app and API, a Uniswap Labs spokesperson told The Block.
The first aggregator hook was introduced in March 2026 on Tempo, a payments-focused blockchain developed by Stripe and Paradigm. Tempo remains available only through the Uniswap web app.
Uniswap initially set out its plans for aggregator hooks in the UNIfication proposal published in November 2025. The company presented the change as an expansion of v4 that would effectively turn it into an aggregator.
How the hooks work
Hooks are a feature of Uniswap v4 that allows developers to add custom rules and functions to liquidity pools. Aggregator hooks use that framework to represent liquidity from other platforms as if it were held in a Uniswap v4 pool.
When a user makes a trade, Uniswap compares prices available in its own pools with those offered by external sources. It can then execute the transaction in a single on-chain 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.
The external sources are included automatically when users swap through the Uniswap web app. Developers using the Uniswap API can also direct trades through the newly launched hooks.
Fees to support UNI burns
Uniswap Labs said trades that use liquidity from external platforms will still incur Uniswap protocol fees. Those fees will contribute to UNI token burns.
The company said the protocol has processed more than $4.5 trillion in total trading volume. Although most on-chain liquidity is already available through Uniswap, it acknowledged that liquidity can continue to emerge elsewhere.
Aggregator hooks are intended to bring those external sources into Uniswap v4, allowing them to be considered alongside the protocol’s own pools when trades are routed. Support for more blockchains is planned beyond the networks covered at launch.
