Uniswap V4 Guide 2026: Hooks, Singleton Contracts, and What Changed
Uniswap V4 launched with a revolutionary "hooks" architecture allowing custom logic in liquidity pools. This guide explains the major changes, new strategies enabled, and the ecosystem impact.
Uniswap V4 represents the largest technical redesign in Uniswap's history. Launched in early 2025, V4 introduces "hooks" — customizable smart contracts that can execute logic before/after swaps, LP deposits, and fee collection. This transforms Uniswap from a rigid protocol into a flexible infrastructure.
What Are Hooks?
Hooks are external smart contracts that attach to Uniswap V4 pools and run at defined lifecycle events. Examples: a TWAP oracle hook that executes on every swap, a dynamic fee hook that adjusts fees based on volatility, a limit order hook that executes when price reaches a target. Hooks turn V4 pools into customizable DeFi building blocks.
Key V4 Improvements
- Singleton contract: all pools in one contract — 99% gas savings on pool creation
- Flash accounting: pay gas for net token movements only (batch swaps much cheaper)
- Native ETH support: wrap/unwrap no longer needed (saves gas on every ETH trade)
- Transient storage: EIP-1153 support reduces gas cost for multi-hop routes
V4 Use Cases Enabled by Hooks
- Auto-compound LP fees back into position
- KYC-gated pools for institutional DeFi compliance
- Subscription-based trading fees
- Oracle-based dynamic liquidity ranges that shift with price
- Prediction market AMMs with hook-based resolution