Uniswap

Uniswap is the largest decentralized exchange (DEX) in cryptocurrency, allowing users to swap tokens directly from their wallets without a central intermediary. Created by Hayden Adams and launched in November 2018, Uniswap pioneered the Automated Market Maker (AMM) model that has since become the standard for decentralized trading across all major blockchains.

Instead of traditional order books used by centralized exchanges, Uniswap uses liquidity pools. Anyone can deposit pairs of tokens into a pool and earn trading fees proportional to their contribution. Traders swap against these pools using a mathematical formula (the constant product formula) that automatically adjusts prices based on supply and demand. This eliminates the need for market makers and order matching engines.

The UNI governance token was launched in September 2020 via one of the most generous airdrops in crypto history. Every wallet that had ever used Uniswap received 400 UNI tokens. UNI holders can vote on protocol upgrades, fee structures, and treasury allocations, making Uniswap one of the most actively governed DeFi protocols. The Uniswap treasury holds billions of dollars in UNI tokens designated for community development.

Uniswap has gone through several major upgrades. V2 introduced ERC-20 to ERC-20 swaps. V3 brought concentrated liquidity, letting providers focus their capital on specific price ranges for higher efficiency. V4 introduced hooks, allowing developers to customize pool behavior. The protocol operates on Ethereum, Polygon, Arbitrum, Optimism, and other chains, consistently handling billions in monthly trading volume and cementing its role as DeFi's central trading infrastructure.