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Uniswap V4 is Changing the Way DeFi Works

By Romeo F.
31 Oct 2023
6 min read

Uniswap V4 is the latest version of the popular decentralized exchange platform built on the Ethereum Virtual Machine. It introduces several key innovations aimed at enhancing customization and gas efficiency.

Uniswap's Iterations

Uniswap has gone through several iterations, with Uniswap V1, V2, and V3 introducing various improvements. Each version addressed specific challenges and added new features.




Uniswap V1 (2018)


Uniswap V1 introduced the Constant Product Market Maker (CPMM) model, enabling anyone to provide liquidity to trading pairs. However, it only supported token swaps between ERC-20 tokens and Ether (ETH), and between ERC-20 tokens, necessitating a two-step process for the latter.




Uniswap V2 (2020)


Uniswap V2 expanded on the AMM model by allowing direct token-to-token swaps, lowering slippage and enhancing capital efficiency. It also introduced flash swaps and Time Weighted Average Prices (TWAP) for secure price usage.

Breaking down V2 Pool Transaction Mechanism. Credit: Better Programming



Uniswap V3 (2021)


Uniswap V3 focused on improving capital efficiency and concentrated liquidity. It enabled liquidity providers to choose specific price ranges, introduced multiple fee tiers, and introduced Non-Fungible Liquidity (NFL) to represent liquidity positions as NFTs. It also integrated with Ethereum's Layer 2 solution, Optimism.

Uniswap V4: The Game-Changing Features

Hooks in Uniswap V4


Uniswap V4 introduces a series of groundbreaking features, and at the forefront of this evolution are "hooks." These customizable smart contract plugins are the key to unleashing a new world of possibilities within Uniswap V4.



1. Customizable Smart Contract Plugins: Hooks are specialized pieces of code that can be added to liquidity pools, allowing developers and liquidity providers to tailor the behavior of these pools to their specific needs.

The introduction of hooks opens up a realm of customization within Uniswap V4, creating opportunities for innovative features and functionalities.

2. Enabling Dynamic Fees and On-Chain Limit Orders: One of the most exciting applications of hooks is their ability to introduce dynamic fees, on-chain limit orders, and even act as time-weighted average market makers (TWAMM).

These features enable liquidity pools to support dynamic fees natively, making trading more efficient and customizable. Liquidity providers can now have greater control over their pool's operations and tailor them to meet various trading strategies.

3. The Role of Hooks in Customization without Protocol Modification: What makes hooks particularly powerful is that they allow for customization without the need to modify the core Uniswap protocol.

This flexibility ensures that Uniswap can evolve and adapt to the changing needs of users and developers while maintaining its stability and security.

Credit: Codezeroes



Singleton Architecture


Uniswap V4 brings a revolutionary shift in its architecture with the introduction of the "Singleton" model, departing from the traditional factory model used in previous versions.



1. Transition from the Factory Model to a Consolidated Contract: In previous iterations, a new contract was deployed for each liquidity pool, making the creation and management of multiple pools complex and costly. Uniswap V4 consolidates all pools into a single smart contract, simplifying the entire ecosystem.



2. Benefits of the Singleton Model: The Singleton architecture comes with several advantages, including:

Cost Efficiency: It significantly reduces the costs associated with creating new liquidity pools and minimizes gas fees for transactions interacting with multiple pools.
Ease of Integration: Developers find it more straightforward to interact with a single contract, making it easier to build complex functionalities on top of Uniswap V4.
Improved Asset Management: The Singleton model introduces "flash accounting," allowing tokens to be used for various operations within a single transaction, further lowering gas costs.
Flexibility: With all pools residing in one contract, it becomes easier to implement features that affect multiple pools simultaneously.




Flash Accounting


Uniswap V4's architectural innovations are complemented by the introduction of "flash accounting," a system that streamlines asset transfers during swaps, ultimately leading to significant gas savings.



1. Streamlining Asset Transfers During Swaps: In previous versions of Uniswap, each operation, such as token swaps or adding liquidity to a pool, involved multiple token transfers, which could be inefficient and costly.

Uniswap V4 optimizes this process by ensuring that external transfers are only made at the end of a transaction, simplifying pool operations and reducing costs.

2. Reducing Gas Costs Through External Transfers: Flash accounting, in combination with the Singleton model and hooks, enables more efficient routing across multiple pools.

As hooks increase the number of liquidity pools within the Uniswap ecosystem, this streamlined approach becomes particularly valuable in maintaining cost efficiency.

Credit: Uniswap

Reintroduction of Native ETH

To fully appreciate the significance of the reintroduction of native ETH support in Uniswap V4, it's essential to consider the historical context.

In Uniswap V1, ETH was directly supported, allowing users to trade Ether with ERC-20 tokens. However, this native ETH support was absent in Uniswap V2 and V3.

Uniswap V2, while introducing various improvements, removed the option for users to trade directly with native ETH due to implementation complexities and concerns about liquidity fragmentation.

This decision necessitated the use of Wrapped ETH (WETH), a tokenized version of Ether, for trading.

Uniswap V3 continued this practice, requiring users to wrap their ETH into WETH before engaging in trading activities on the platform. While WETH serves its purpose, it adds an extra layer of complexity and incurs additional gas costs.




Benefits of Native ETH Support


The reintroduction of native ETH support in Uniswap V4 brings forth a range of benefits, both in terms of user experience and cost efficiency.

Simplifying the Trading Process: One of the primary advantages is the simplification of the trading process. With native ETH, users can seamlessly exchange Ether for any supported token without the need for token wrapping.

This streamlined process enhances the accessibility and usability of Uniswap for a broader audience.

Reducing Gas Costs: Native ETH transfers offer a significant reduction in gas costs compared to their tokenized counterparts.

Sending native ETH incurs approximately half the gas cost of ERC-20 transfers, making trading more cost-effective and accessible to a wider range of users.




Impact on the Uniswap Ecosystem


The reintroduction of native ETH support in Uniswap V4 is poised to have a substantial impact on the broader Uniswap ecosystem. It aligns with the platform's mission to create a more efficient, user-friendly, and cost-effective environment for decentralized trading.

By simplifying the trading process and reducing gas costs, Uniswap V4 becomes more attractive to users and liquidity providers. Native ETH support can help increase the accessibility of the platform, particularly for those who may have been deterred by the need to wrap their Ether in previous versions.

This, in turn, has the potential to enhance liquidity, trading volumes, and user engagement within the Uniswap ecosystem.

The reintroduction of native ETH support in Uniswap V4 marks a return to the platform's roots and a commitment to improving the user experience. As we progress through this guide, you'll discover more about the broader implications of these enhancements and how they fit into the grand vision of Uniswap V4.

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