Uniswap Labs has expanded Uniswap v4’s routing system to draw on liquidity from external decentralized exchanges, launching aggregator hooks on Ethereum, Base and Robinhood Chain. The feature allows swaps initiated through the Uniswap web app or API to compare available routes across Uniswap pools and selected third-party venues, with qualifying trades executed in a single transaction.
The rollout initially connects Uniswap v4 routing to Fluid, Curve and PancakeSwap. When an external venue provides a more favorable route for a swap, Uniswap’s router can include that liquidity source rather than limiting execution to pools deployed directly on Uniswap.
Trades routed through outside liquidity will also pay Uniswap protocol fees, according to Uniswap Labs. Those fees contribute to the mechanism used to burn UNI tokens, extending the protocol’s fee capture beyond swaps completed entirely within Uniswap-native pools.
The launch changes the role of Uniswap v4 from a venue that routes primarily through its own liquidity into a routing layer that can incorporate selected external markets. For users, the practical effect could be fewer cases where they need to manually compare prices between decentralized exchanges before executing a large or less-liquid swap.
External protocols become routing options
Aggregator hooks use Uniswap v4’s customizable hook architecture, which allows developers to add logic around how a liquidity pool operates. In this case, a hook packages an outside source of liquidity so that Uniswap’s routing engine can treat it similarly to a v4 pool when evaluating a trade.
That structure allows the router to consider a path through Curve, Fluid or PancakeSwap alongside paths through Uniswap pools. A swap may therefore remain entirely on Uniswap, draw from an external venue, or potentially use a route involving multiple sources, depending on available prices and liquidity.
The design does not guarantee that every trade will use external liquidity or receive a better execution price. Routing outcomes depend on factors including pool depth, fees, price impact and the cost of executing transactions on the relevant network. The feature instead gives Uniswap’s router a larger set of venues to evaluate automatically.
Users of the Uniswap web app do not need to manually enable each source, Uniswap Labs said. External liquidity is included in routing calculations by default. Developers building through the Uniswap API can also access the aggregator hooks, placing the functionality in front of applications that use Uniswap’s trading infrastructure rather than only users of its consumer-facing interface.
Ethereum, Base and Robinhood Chain receive API access
Ethereum, Base and Robinhood Chain are the first networks where aggregator hooks are available through both the Uniswap web app and API. Uniswap Labs said it plans to add support for additional blockchains.
The company had already introduced the first aggregator hook in March 2026 on Tempo, the payments-focused blockchain developed by Stripe and Paradigm. Tempo’s implementation is available only through the Uniswap web app, making the new launch the first expansion that also gives API users access to the routing model.
The distinction matters for trading interfaces, wallets and decentralized applications that depend on the API to source swap quotes and execute transactions. They can now access external liquidity integrations without building separate routing connections to each participating protocol.
Robinhood Chain’s inclusion also places the tool on a network beyond Ethereum and Base, although Uniswap Labs has not detailed further external-liquidity venues or chains planned for the next phase of the rollout.
A proposal outlined the fee connection
The launch follows the UNIfication proposal published in November 2025, which outlined plans to integrate aggregator hooks into Uniswap v4’s routing system. That proposal linked external-liquidity routing with Uniswap’s protocol fee framework, creating a way for swaps that rely on outside venues to contribute fees through Uniswap.
For UNI holders, the arrangement makes routing volume more relevant than the narrower measure of liquidity held solely in Uniswap pools. If users access third-party liquidity through Uniswap’s routes, the protocol can collect fees even though part of the transaction’s execution occurs through another decentralized exchange.
That creates a commercial incentive for Uniswap Labs to expand the set of supported sources, while also requiring careful selection of integrations. Each additional venue introduces smart-contract and routing considerations, including the reliability of quoted prices, the behavior of outside pools and the gas cost of more complex swap paths.
Uniswap Labs said the protocol has processed more than $4.5 trillion in cumulative trading volume. Connecting v4 routing to external sources is an effort to direct a larger share of future decentralized trading activity through its interface and API, even where the underlying liquidity was created elsewhere.
Routing competition moves beyond pool deployment
The development also changes how decentralized exchanges compete for order flow. Traditionally, a protocol seeking stronger execution needed to attract liquidity providers to deploy capital in its own pools. Aggregator hooks give Uniswap another option: route to liquidity maintained by other protocols when that liquidity offers a viable execution path.
Curve, PancakeSwap and Fluid retain their underlying pools and liquidity arrangements, while Uniswap provides another route through which their pools may receive trading flow. The model resembles the role played by aggregators in decentralized finance, but embeds the external connection inside Uniswap v4’s hook-based pool architecture.
The initial integration will test whether users and developers favor a router that combines native and external liquidity under one transaction flow. Its early performance will likely depend less on the number of connected protocols than on whether the available routes consistently offset additional execution costs and deliver competitive quotes across the three supported networks.
By attaching protocol fees and UNI burns to eligible external-liquidity routes, Uniswap has given v4’s routing layer a direct economic reason to look beyond its own pools.
Optimize your DEX strategies by exploring Uniswap-style liquidity routing concepts in our in-depth guide: CEX vs DEX.
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