In the upcoming Uniswap v4, the automated market maker (AMM) undergoes a significant architectural overhaul with the adoption of the Singleton design pattern. This innovative approach consolidates all pools into a single contract, resulting in optimized gas usage and streamlined token transfers.
Previously, each pool in Uniswap v3 existed as a separate smart contract. However, in the forthcoming v4, all pools will be contained within a single contract, eliminating the necessity for token transfers between distinct contracts for multi-hop routes.
By leveraging the Singleton design, the creation of a new pool in Uniswap v4 becomes approximately 99% more cost-effective, leading to substantial savings for users.
Another noteworthy feature in Uniswap v4 is Flash Accounting, which enables efficient balance calculations within the same contract. By performing all essential calculations in a single contract, Flash Accounting minimizes the gas costs associated with token transfers.
1/ Uniswap v4 makes some big changes to v3.
Like rearchitecting Uniswap’s AMM to have only one contract 🙀
It’s called the “Singleton” design pattern and it’s a big gas saver.🧵
— Uniswap Labs 🦄 (@Uniswap) June 20, 2023
Furthermore, the introduction of the Singleton architecture and Flash Accounting has eradicated fee tiers, a limitation present in Uniswap v3 aimed at avoiding liquidity fragmentation. With Uniswap v4, users now have the freedom to seamlessly navigate between pools at significantly reduced costs. Swappers are empowered to establish any swap fee or dynamically modify fees, offering increased flexibility and enhanced control over their trades.
Uniswap remains at the forefront of revolutionizing decentralized finance (DeFi) through its advancements in AMM protocols. The integration of the Singleton design pattern and Flash Accounting optimizes gas efficiency, reduces costs, and enhances the overall trading experience for users.