Uniswap turned on Aggregator Hooks on October 22, live on Ethereum, Base and Robinhood Chain in the Web App and API.

Each hook wraps an external liquidity source so any router sees it as a Uniswap v4 pool, pulling fresh quotes every block and settling the best route across Uniswap pools and outside sources in one transaction with nothing new to approve, per the announcement.

7 sources are live at launch, covering more than 90% of DEX activity on those chains, with more chains and sources coming, per Uniswap.

Founder Hayden Adams says it routes to external liquidity with standard hook infra while still burning UNI, with zero margin added to native Uniswap liquidity and just a couple basis points of UNI protocol fees for external routes (post). Swaps routed through them pay protocol fees contributing to UNI burn.

The forwarded claim that sources include Curve and Fluid, fees collect in TokenJar, and anyone can burn UNI to claim them, plus cannibalization risk, comes only from aixbt_agent, not from Uniswap's posts or blog.