Pool Manager
The singleton contract in Uniswap v4 that manages all pools, liquidity, and swaps in a unified system.
The Pool Manager (PoolManager.sol) is the core singleton contract of Uniswap v4. Unlike previous versions where each token pair required a separate contract deployment, the Pool Manager consolidates all pools into a single contract.
Role in Architecture
It serves as the central hub for:
- Pool State: storing the state of every pool (liquidity, ticks, fees).
- Swapping & Liquidity: handling all swap and liquidity provision logic.
- Hook Integration: managing the lifecycle calls to Hooks.
- Flash Accounting: enforcing the solvency of transactions via certain tracking mechanisms (deltas).
This Singleton Architecture drastically reduces gas costs for pool creation and multi-hop swaps.
Articles Using This Term
Learn more about Pool Manager in these articles:
Uniswap V4 Hooks — Introduction to Hooks — Find the answer to your questions
A comprehensive Q&A on Uniswap v4 Hooks, covering technical implementation, security considerations, and architecture from the Uniswap Hook Incubator Cohort 2.
Uniswap v4 Architecture & Security Analysis: Hooks, Singleton, Flash Accounting
Complete technical analysis of Uniswap v4: hook security, singleton architecture, gas optimization, and developer integration. Learn the security risks and best practices.
Related Terms
Singleton Architecture
A design pattern where all pools are managed within a single unified contract, reducing gas costs.
Hooks
External smart contracts in Uniswap v4 that execute custom logic at specific points in a pool's lifecycle.
Flash Accounting
A gas optimization technique that tracks balance deltas during a transaction and only settles the final net amount.
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