Uniswap v4 has recorded more than 90,000 unique hooks initialized and attached to at least one deployed pool, according to on-chain dashboards including Dune Analytics. The figure is roughly four times the approximately 22,600 hooks recorded earlier in 2026 and marks rapid adoption of a feature that did not exist before January 2025. Hooks are plug-ins built with smart contracts (self-executing blockchain code) that run at defined stages of a pool’s lifecycle, including before or after swaps and when liquidity is added or removed. They allow developers to introduce features such as volatility-based dynamic fees without modifying or forking Uniswap’s core protocol. The v4 design also uses permission data encoded in hook addresses to reduce storage lookups and combines the hooks system with a singleton PoolManager, placing all pools in one contract rather than deploying a separate contract for each pool as in v3. That architecture lowers deployment costs and makes interactions across multiple pools cheaper. Notable examples include DualPool, developed in partnership with Spark, audited, and open-sourced to direct idle concentrated liquidity into yield-generating strategies until needed for swaps. Other hooks adjust fees according to volatility or trading volume, or target MEV (value extracted from transaction ordering) by seeking to capture or redistribute value typically taken by searchers and block builders.