Uniswap v4's Singleton Architecture Transforms Liquidity Routing

The latest version of Uniswap, v4, has introduced significant changes to its liquidity routing system. The PoolManager contract now manages all liquidity pools in a singleton architecture, reducing pool creation costs by 99% compared to version 3.

This design change allows for more efficient routing and improves the efficiency of multi-hop swaps across various token pairs. Uniswap v4 also maintains the concentrated liquidity model used in previous versions, but rebuilds it around the singleton. This setup enables flash accounting to track balance deltas, reducing gas costs by using transient storage introduced by EIP-1153.

The implementation of hooks has also enabled new pool types, such as EulerSwap and Angstrom, which can connect swaps to lending vaults or use batch auctions to clear each block at one uniform price. These hooks drive liquidity and volume remains high, with Uniswap's daily transaction count exceeding 7 million for the first time in August 2026.

However, the new architecture also raises concerns about security risks, particularly regarding custom accounting logic used by developers. The Bunni and Cork exploits demonstrate this vulnerability, resulting in losses of $8.4 million and $12 million, respectively.