Uniswap v4 is now officially live, delivering a more streamlined experience, reduced costs, and enhanced flexibility for DeFi users. This guide offers an in-depth look at the major updates in the 2025 edition of the decentralized exchange and compares them to earlier versions.
What Is Uniswap v4? What Makes It Different?
Uniswap v4 is the latest upgrade of the world’s largest decentralized exchange, designed to reduce trading costs, improve efficiency, and empower users with greater liquidity and fee control.
Uniswap v4 has become one of the most talked-about topics in DeFi for 2025. Here’s a quick overview of its key new features:
Lower Gas fees — Creating liquidity pools is up to 99.99% cheaper.
Hooks mechanism — Developers can tailor trading logic, including dynamic fees and limit orders.
Flash Accounting — Minimizes unnecessary token transfers, further saving Gas fees.
Dynamic fees — Pools automatically adjust trading fees in response to market conditions.
Native ETH support — No need to convert ETH to WETH for trading.
Singleton Contract — All liquidity pools are managed under one contract, dramatically reducing complexity.
Concentrated Liquidity lets liquidity providers (LPs) choose specific price ranges for their funds.
Multiple fee tiers (0.05%, 0.3%, 1%) for greater market efficiency.
Higher capital efficiency, but each pool is its own smart contract, leading to higher Gas fees.
Fact check: Uniswap v3’s high costs stem from Gas fees, since each pool is a separate smart contract. Creating new pools or multi-hop swaps requires multiple contract interactions, making v3 transactions costlier than v4.
Uniswap Version Comparison
Uniswap Version Comparison
All available versions: Uniswap
In-Depth Analysis of Uniswap v4 Features
Let’s take a closer look at the new features introduced in Uniswap v4.
Major Change: Singleton Contract
Previously (v3): Every new liquidity pool needed its own smart contract, resulting in higher transaction costs.
Now (v4): Adopts the Singleton Design, consolidating all pools under a single contract, greatly reducing Gas fees.
Simple analogy: In v3, each trading pair was like opening a separate store; in v4, all pairs operate within a massive shopping mall, making trading cheaper and more efficient.
Previously (v3): Every token swap triggered multiple token transfers, increasing Gas fees.
Now (v4): Uniswap only tracks balance changes internally and executes the final transfer at the end, reducing Gas fees.
Simple analogy: Ordering five dishes—v3 delivers each one separately, slow and inefficient; v4 prepares and serves them all at once, saving time and costs.
Dynamic Fees
This feature brings smarter pricing to swaps. Here’s how it differs:
Previously (v3): Trading fees were fixed (0.05%, 0.3%, 1%), and LPs couldn’t adjust rates based on market conditions.
Now (v4): Fees can rise during volatile periods and fall when markets are stable, optimizing LP returns.
Why does this matter? Stable markets mean lower fees for traders; active markets mean higher earnings for LPs—a win-win.
Native ETH Support
Previously (v3): ETH had to be converted to WETH before trading, adding extra Gas costs.
Now (v4): Direct trading with native ETH is supported, streamlining the process and reducing Gas costs.
Simple analogy: In v3, shopping with cash meant exchanging it for a gift card (WETH) first; in v4, you pay directly with cash (ETH), skipping unnecessary steps.
More Flexible Liquidity Management (Subscribers Mechanism)
Previously (v3): Earning extra liquidity rewards required staking your position, temporarily losing control of your funds.
Now (v4): The Subscribers mechanism lets users earn rewards without giving up fund control.
Simple analogy: In v3, you handed your car keys to a valet (staking) for extra rewards; in v4, you keep your keys and still earn parking rewards (Subscribers).
Why Choose Uniswap v4?
You might choose v4 if:
You’re a trader: Enjoy lower Gas fees, native ETH support, and more efficient trading.
You’re a liquidity provider (LP): Use Hooks to optimize liquidity and earn higher returns with dynamic fees.
You’re a developer: Take full control of trading strategies with custom Hooks.
If you’re seeking alternatives outside Uniswap, check the X post below for options.
If you’ve used Uniswap, you’ve interacted with liquidity pools—but their mechanics aren’t always intuitive.
Fact check: A liquidity pool is a fund containing two tokens (like ETH and USDC) where traders swap tokens, and LPs earn a share of trading fees by depositing tokens.
Uniswap v3 vs. v4 Liquidity Pool Mechanics
Previously (v3): Each trading pair operated its own smart contract. Multi-pool trades required interacting with several contracts, leading to higher Gas fees and slower transactions.
Now (v4): Pools are managed by a single PoolManager, eliminating reliance on separate contracts.
What does this mean?
Creating new pools is up to 99.99% cheaper, since no new smart contract deployment is needed.
Multi-hop swaps are more affordable, with reduced token movement.
Centralized pool management enhances trading speed and efficiency.
Additionally, v3 struggled with token transfer efficiency—each trade or liquidity adjustment triggered multiple ERC-20 transfers, increasing Gas fees. v4 optimizes transfers, cutting these costs.
Operating pool: Uniswap
ERC-6909: A More Efficient Pool Token System
Uniswap v4 upgrades from ERC-1155 to ERC-6909, optimizing token claiming, redemption, and liquidity position management.
Did you know? Before using ERC-6909, Uniswap v4 considered ERC-1155—a multi-token standard for single contracts. But ERC-1155’s forced callbacks and batching constraints led to high Gas fees for some operations.
Now, Uniswap v4 uses ERC-6909, a lighter, more Gas-efficient token standard that reduces unnecessary external calls, lowering costs for LPs and traders.
Impact on LPs and Traders:
Lower Gas fees when adding or removing liquidity.
More efficient liquidity management—LPs don’t need to move ERC-20 tokens with every pool interaction.
High-frequency traders and liquidity managers benefit most, avoiding costly ERC-20 approvals and transfers.
Simple explanation: In v3, each pool interaction was like going to the bank for every withdrawal and deposit—costly and inefficient. In v4, ERC-6909 lets LPs hold a prepaid balance claim token that auto-adjusts, saving time and Gas fees.
Current Status of Uniswap v4
Uniswap v4 is live, but there’s plenty happening behind the scenes:
v4 is deployed on 10+ blockchains, including Ethereum, Polygon, Arbitrum, OP Mainnet, Base, BNB Chain, Blast, World Chain, Avalanche, and Zora Network.
Liquidity is still migrating—many traders use v3 pools, but v4 liquidity is steadily growing and pools are improving.
Trades are routed via UniswapX across v2, v3, and v4, automatically seeking the best price for users.
Supported blockchains: Uniswap v4
Note: When trading, no extra steps are needed—Uniswap automatically routes your order to the optimal pool (v2, v3, or v4). If you’re an LP, you can keep using v3 or migrate to v4 for lower Gas fees and greater customization.
Did you know? v4 isn’t a mandatory upgrade—it’s an optimized option for users seeking lower fees and more control.
Uniswap v4 vs. Older Versions
Uniswap v4 delivers lower transaction costs, greater flexibility, and advanced features, making it the top choice for most users moving forward. However, v3 still offers deep liquidity, and some traders and LPs may prefer its fixed fees and mature ecosystem. v4 represents the future, but v3 and v2 remain viable for specific needs—your choice depends on your trading style and liquidity strategy.
Disclaimer:
This article is reprinted from [beincrypto]. All copyrights belong to the original author [Ananda Banerjee]. If you have any concerns about this reprint, please contact the Gate Learn team for prompt assistance.
Disclaimer: The views and opinions expressed in this article are solely those of the author and do not constitute investment advice.
The Gate Learn team translated this article into other languages. Unless otherwise stated, copying, distributing, or plagiarizing this translation is prohibited.
Yala inherits the security and decentralization of Bitcoin while using a modular protocol framework with the $YU stablecoin as a medium of exchange and store of value. It seamlessly connects Bitcoin with major ecosystems, allowing Bitcoin holders to earn yield from various DeFi protocols.
Sui is a PoS L1 blockchain with a novel architecture whose object-centric model enables parallelization of transactions through verifier level scaling. In this research paper the unique features of the Sui blockchain will be introduced, the economic prospects of SUI tokens will be presented, and it will be explained how investors can learn about which dApps are driving the use of the chain through the Sui application campaign.
Hyperliquid's vision is to develop an on-chain open financial system. At the core of this ecosystem is Hyperliquid L1, where every interaction, whether an order, cancellation, or settlement, is executed on-chain. Hyperliquid excels in product and marketing and has no external investors. With the launch of its second season points program, more and more people are becoming enthusiastic about on-chain trading. Hyperliquid has expanded from a trading product to building its own ecosystem.
A stablecoin is a cryptocurrency with a stable price, which is often pegged to a legal tender in the real world. Take USDT, currently the most commonly used stablecoin, for example, USDT is pegged to the US dollar, with 1 USDT = 1 USD.
