Uniswap V2, V3, Sushiswap: listen for swaps

listen.js

const ethers = require('ethers')

const v3PoolArtifact = require("@uniswap/v3-core/artifacts/contracts/UniswapV3Pool.sol/UniswapV3Pool.json")
const v2PairArtifact = require('@uniswap/v2-periphery/build/IUniswapV2Pair.json')

const USDC_ETH_V3 = '0x88e6a0c2ddd26feeb64f039a2c41296fcb3f5640'
const ETH_USDT_V2 = '0x0d4a11d5eeaac28ec3f61d100daf4d40471f1852'
const ETH_USDT_SUSHI = '0x06da0fd433c1a5d7a4faa01111c044910a184553'

sqrtToPrice = (sqrt) => {
    const numerator = sqrt ** 2
    const denominator = 2 ** 192
    let ratio = numerator / denominator
    const decimalShift = Math.pow(10, -12)
    ratio = ratio * decimalShift
    return ratio
}

ratio0ToPrice = (amount0In, amount1Out) => 1/(Number(amount0In)/Number(amount1Out)/10**12)
ratio1ToPrice = (amount1In, amount0Out) => Number(amount1In)/Number(amount0Out)*10**12

const provider = new ethers.JsonRpcProvider('https://mainnet.infura.io/v3/abc')

const v3Pool = new ethers.Contract(USDC_ETH_V3, v3PoolArtifact.abi, provider)
const v2Pair = new ethers.Contract(ETH_USDT_V2, v2PairArtifact.abi, provider)
const sushiPair = new ethers.Contract(ETH_USDT_SUSHI, v2PairArtifact.abi, provider)


v3Pool.on('Swap', (sender, recipient, amount0, amount1, sqrtPriceX96) => {
    const ratio = sqrtToPrice(String(sqrtPriceX96))
    console.log(
        'Uni V3', '|',
        'pair:', 'ETH/USDC', '|',
        'sender:', sender, '|',
        'ratio:', 1/ratio,
    )
})

v2Pair.on('Swap', (sender, amount0In, amount1In, amount0Out, amount1Out, to) => {
    console.log(
        'Uni V2', '|',
        'pair:', 'ETH/USDT', '|',
        'sender:', sender, '|',
        'ratio0:', ratio0ToPrice(amount0In, amount1Out),
        'ratio1:', ratio1ToPrice(amount1In, amount0Out),
    )
})

sushiPair.on('Swap', (sender, amount0In, amount1In, amount0Out, amount1Out, to) => {
    console.log(
        'Sushi', '|',
        'pair:', 'ETH/USDT', '|',
        'sender:', sender, '|',
        'ratio0:', ratio0ToPrice(amount0In, amount1Out),
        'ratio1:', ratio1ToPrice(amount1In, amount0Out),
    )
})

package.json

{
  "name": "01",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "@uniswap/v2-periphery": "^1.1.0-beta.0",
    "@uniswap/v3-core": "^1.0.1",
    "dotenv": "^16.0.3",
    "ethers": "^6.3.0",
    "hardhat": "^2.14.0"
  }
}