Uniswap Labs has launched aggregator hooks on Ethereum, Base and Robinhood Chain, enabling Uniswap v4 to route trades through liquidity held on external platforms like Fluid, Curve, and PancakeSwap. These hooks allow Uniswap to compare prices across its own pools and external sources, then complete the trade in one transaction. Trades routed through external liquidity sources will incur Uniswap protocol fees, which will contribute to UNI token burns.