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uniswap-v4-expert

Use when building on, integrating with, or analyzing Uniswap V4. Covers PoolManager singleton architecture, flash accounting via EIP-1153 transient storage, hook lifecycle, PoolKey structure, Currency type, dynamic fees, custom accounting, native ETH support, PositionManager (ERC-721 positions), and production deployment addresses.

skills/uniswap-v4-expert/SKILL.md

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Repository last updated: Oct 23, 2026
License: MIT

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# Uniswap V4 Expert

## Architecture Overview

Uniswap V4 replaces V3's factory-per-pool model with a **singleton PoolManager** — every pool lives inside a single contract. This eliminates redundant bytecode deployments and enables multi-hop swaps to settle only net token transfers. All state-changing operations use **flash accounting** via EIP-1153 transient storage: callers accumulate deltas during an `unlock()` callback and must zero out all balances before the callback returns.

### Singleton Design

```
┌────────────────────────────────────────────┐
│                 PoolManager                │
│  ┌──────────┐ ┌───────────┐ ┌──────────┐   │
│  │  Pool A  │ │  Pool B   │ │  Pool C  │   │
│  │ ETH/USDC │ │ WBTC/USDC │ │ ETH/DAI  │   │