Uniswap: The Complete Guide 2026
The world's largest DEX · +150 XP · 12 min read · Updated March 2026
What is Uniswap?
Uniswap is the world's largest decentralized exchange (DEX), allowing anyone to swap ERC-20 tokens without a centralized intermediary. Launched in 2018 by Hayden Adams, it pioneered the Automated Market Maker (AMM) model — replacing traditional order books with liquidity pools governed by a simple constant-product formula: x × y = k.
In 2026, Uniswap V4 is the dominant version, introducing hooks — custom smart contract callbacks that fire before/after swaps, allowing developers to build MEV protection, limit orders, dynamic fees, and custom oracles directly into liquidity pools.
Version History
| Version | Year | Key Innovation | Status |
|---|---|---|---|
| V1 | 2018 | First AMM on Ethereum, ETH-token pairs only | Legacy |
| V2 | 2020 | ERC-20/ERC-20 pairs, flash swaps, TWAP oracle | Active |
| V3 | 2021 | Concentrated liquidity, multiple fee tiers (0.05%/0.3%/1%) | Primary |
| V4 | 2024 | Hooks, singleton architecture, native ETH pairs, gas -99% | Latest ✅ |
How to Use Uniswap
UNI Token & Governance
The $UNI token governs the Uniswap Protocol. Token holders vote on protocol upgrades, fee switch activation, treasury allocation, and grant distributions. As of 2026, the "fee switch" — directing a portion of swap fees to $UNI stakers — has been activated on select pools, making UNI a yield-bearing governance token.
Risks & Considerations
MEV / Sandwich Attacks: Bots can front-run your trades. Use slippage protection and consider private mempools (Flashbots Protect).
Smart Contract Risk: Despite audits, smart contract bugs are possible. Use only official app.uniswap.org and verify contract addresses.