Transcription of Uniswap v2 Core
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Uniswap v2 Core
Uniswap v2 CoreHayden 2020 AbstractThis technical whitepaper explains some of the design decisions behind the Uniswapv2 core contracts. It covers the contracts new features including arbitrary pairsbetween ERC20s, a hardened price oracle that allows other contracts to estimate thetime-weighted average price over a given interval, flash swaps that allow traders toreceive assets and use them elsewhere before paying for them later in the transaction,and a protocol fee that can be turned on in the future. It also re-architects the contractsto reduce their attack surface. This whitepaper describes the mechanics of Uniswap v2 s core contracts including the pair contract that stores liquidity providers funds andthe factory contract used to instantiate pair IntroductionUniswap v1 is an on-chain system of smart contracts on the Ethereum blockchain, imple-menting an automated liquidity protocol based on a constant product formula [1].
Speci cally, prices at a given moment are stored as UQ112.112 numbers, meaning that 112 fractional bits of precision are speci ed on either side of the decimal point, with no sign. These numbers have a range of [0, 2112 41] and a precision of 1 2112. The UQ112.112 format was chosen for a pragmatic reason | because these numbers can
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