Uniswap v4 can now route trades through liquidity outside its own pools: aggregator hooks are live on Ethereum, Base and Robinhood Chain, available in both the Uniswap web app and API. The first external sources are Fluid, Curve and PancakeSwap.

Each hook wraps an external venue in a Uniswap v4 hook, so any router treats it as a regular Uniswap pool. The system compares prices across internal and external pools and settles the trade in a single transaction.

Protocol fees from swaps that use external liquidity will feed UNI token burns.

The first aggregator hook went live in March 2026 on Tempo, the payments chain from Stripe and Paradigm. The plan dates back to the UNIfication proposal of November 2025, which set out to turn v4 into a full aggregation layer. Uniswap has processed over $4.5T in cumulative volume.