Uniswap v4 Hooks

Programmable Liquidity Pools

Uniswap v4 introduced hooks: smart contracts that plug into a liquidity pool and run custom logic at specific moments — before and after a swap, before and after liquidity is added or removed, and at pool initialisation. Earlier Uniswap versions were fixed: every pool behaved the same way. Hooks make a pool programmable, so developers can attach custom behaviour to an otherwise standard AMM. This turns Uniswap from a fixed product into a platform other people build on top of.

What Hooks Enable

With hooks, a pool can do things the base AMM never could: charge dynamic fees that change with volatility, run on-chain limit orders, auto-compound or redistribute fees, implement time-weighted average price (TWAMM) orders that execute large trades gradually, capture or redistribute MEV, gate access, or feed custom oracles. Because the hook runs at defined points in the swap/liquidity lifecycle, it can modify or extend behaviour while the core pool math stays standard and audited. The result is an ecosystem of specialised pools built on shared, battle-tested plumbing.

• Hooks are contracts that run custom logic at set points in a pool's lifecycle
• They make Uniswap pools programmable rather than one-size-fits-all
• Enables dynamic fees, on-chain limit orders, TWAMM, custom oracles, MEV capture, and more
• The core AMM stays standard; hooks extend it at defined moments