Uniswap's conceptual origin traces back to Vitalik Buterin: in an October 2016 Reddit post and a June 2017 blog post, he outlined the concept of an on-chain automated market maker (AMM) (the idea's true origin is disputed — Buterin credits Martin Köppelmann of Gnosis, while Hayden Adams credits Alan Lu, also of Gnosis). The builder, Hayden Adams, was a mechanical engineer at Siemens, laid off in July 2017 — his friend Karl Floersch (a researcher at the Ethereum Foundation) convinced him to learn Ethereum and Solidity.
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October 2017: Adams builds a first, never-launched proof-of-concept — a single liquidity pool swapping ETH for a generic testnet ERC-20 token (notably, that testnet token was already called “UNI” at this early stage).
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April 2018: Adams — unemployed for 10 months, his living-expense crypto down 75% — books a flight to Deconomy 2018 in South Korea. He tries to sneak into the conference without a ticket and is turned away, but arriving Ethereum Foundation researcher Karl Floersch introduces him to Vitalik Buterin, who reads the entire smart contract on his phone on the spot and suggests applying for an Ethereum Foundation grant.
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July 2018: a $100,000 Ethereum Foundation grant. The project was nearly named “UniPeg,” but Buterin suggested “Uniswap” instead.
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November 2, 2018: Uniswap v1 launches at Devcon 4 — its core is the classic x*y=k (“constant product”) formula.
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April 2019: a seed funding round, led by Paradigm.
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2020: Uniswap v2 (direct ERC20-to-ERC20 swap support); Sep 14, 2020: the UNI governance token launches, via a retroactive airdrop to past users.
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May 2021: Uniswap v3, introducing concentrated liquidity for greater capital efficiency for liquidity providers.
Uniswap has survived two SEC investigations and a major fork attempt (SushiSwap) — the protocol itself has NO traditional corporate ownership over trading fees; liquidity providers earn the fee revenue, not Uniswap Labs.