Uniswap v4 Launch event

Event · PageRank 0.0008

Overview

Uniswap v4 launched on January 30, 2025, restructuring the protocol around two main changes. "Hooks" are external smart contracts that run custom logic at defined points in a pool's lifecycle — for example before or after a swap — enabling dynamic fees, on-chain limit orders, TWAMM and other custom behaviours without forking the protocol. The "singleton" architecture holds every pool inside a single contract rather than deploying a new contract per pool, cutting pool-creation gas costs by up to about 99% versus v3 and making multi-hop routing cheaper. Uniswap v4 was deployed across multiple chains including Ethereum, Arbitrum, OP Mainnet, Polygon, Base, BNB Chain, Blast, World Chain, Avalanche and Zora.

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Frequently asked questions

When did Uniswap v4 launch?

January 30, 2025.

What are hooks?

Hooks are smart contracts that execute custom logic at specific points in a pool's lifecycle, such as before or after a swap, letting developers build dynamic fees, on-chain limit orders, TWAMM and other custom pool behaviours.

What is the singleton architecture and why does it matter?

All pools live in one contract instead of one contract per pool. This cuts pool creation gas costs by up to about 99% compared with v3 and makes routing across multiple pools cheaper.