Uniswap v1 launched in November 2018, built by Hayden Adams, a mechanical engineer who had just been laid off from Siemens and taught himself Solidity. The protocol implemented a simple constant-product AMM formula that Vitalik Buterin had casually described in a forum post. Adams’s contribution was turning that idea into working code. The result became the most important DeFi protocol ever built.
Uniswap v2 launched in May 2020 and kicked off DeFi Summer. Anyone could list a token without permission. Anyone could provide liquidity and earn fees. The design was so simple and so composable that it became the base layer for almost everything else in DeFi. YAM, SushiSwap, and countless forks tried to capture Uniswap’s liquidity during the fair-launch craze. Uniswap survived and dominated.
Uniswap v3 in 2021 introduced concentrated liquidity, letting LPs specify price ranges for their liquidity. It was a massive technical leap and completely changed LP economics. Uniswap v4, shipping in 2024, added “hooks” — programmable extensions that let developers customize pool behavior at the contract level. Each version pushed the state of the art forward, and each version was widely copied.
By 2025, Uniswap had done over $2 trillion in cumulative volume across all versions, was deployed on more than a dozen chains, and had launched Unichain, its own L2 on Optimism’s stack. The UNI token remained one of the largest governance tokens in DeFi despite lacking direct fee capture (a long-running community debate). Hayden Adams, the once-unemployed mechanical engineer, became one of the most important people in crypto. The entire category of AMM-based DEXs exists because he shipped a simple formula, and DeFi wouldn’t exist without him.
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