Uniswap activates aggregator hooks on three chains

As Uniswap v4 brings external liquidity into its routing, Uniswap Labs says its aggregator hooks are live on Ethereum, Base and Robinhood Chain. The launch is available through the Uniswap Web App and API, according to Uniswap Labs’ announcement.

The hooks let Uniswap v4 route trades through outside venues, while fees on those routes contribute to UNI burns.

Uniswap Labs said seven sources are available at launch, covering more than 90% of decentralized exchange activity across the three chains. Fluid, Curve and PancakeSwap are among the sources, according to The Block’s report.

How do the hooks route trades through other venues?

Each Aggregator Hook wraps an external liquidity source in a Uniswap v4 hook, making it appear to a router as a Uniswap pool. Uniswap Labs says the router obtains fresh quotes from connected sources every block, then builds a route across Uniswap pools and external liquidity. The trade settles in one transaction, with no new approval required.

The Uniswap Web App includes external sources automatically in swaps, while developers can route through the hooks using the API. The setup brings other venues into the router’s view without requiring users to select a separate platform, according to Uniswap Labs.

Which chains and interfaces are supported?

The launch supports Ethereum mainnet, Base and Robinhood Chain through both the web app and API, The Block reported. It also reported that the first aggregator hook went live on Tempo in March 2026, supported through the web app only. Uniswap Labs said additional chains and sources are planned, without giving a schedule.

The seven-source launch coverage figure is Uniswap Labs’ estimate across the three newly supported chains. The company said the hooks are designed to bring liquidity formed outside Uniswap into v4, where the router can consider it alongside the protocol’s own pools.

How do external routes connect to UNI burns?

Uniswap Labs says swaps routed through external liquidity pay protocol fees, which contribute to UNI burns. That links routing beyond Uniswap’s own pools to the protocol’s fee mechanism: external sources are presented to the router as v4 pools, and trades that use them generate fees for the protocol.

Uniswap Labs said the protocol has processed more than $4.5 trillion in trading volume. The new hooks extend the sources its routing can consider across the three chains; the company has not disclosed the fee rate for these routes in its announcement.

Sources

• Uniswap Labs’ announcement — blog.uniswap.org
• The Block’s report — theblock.co