Open1

真EVM

ほんやほんや

ethers.jsのドキュメント
https://docs.ethers.org/v6/migrating/

Building an arbitrage bot: Automated Market Makers and Uniswap V2 (article 1/n)
https://blog.blockmagnates.com/building-an-arbitrage-bot-automated-market-makers-and-uniswap-article-1-n-2d208215d8c2
を見ながらUniswapのWETH/USDTのリザーブをするコードを書いた。

import { Contract, ethers, formatUnits } from "ethers";

async function main() {
    const provider = ethers.getDefaultProvider();

    const abi =
        [{ "inputs": [], "payable": false, "stateMutability": "nonpayable", "type": "constructor" }, { "anonymous": false, "inputs": [{ "indexed": true, "internalType": "address", "name": "owner", "type": "address" }, { "indexed": true, "internalType": "address", "name": "spender", "type": "address" }, { "indexed": false, "internalType": "uint256", "name": "value", "type": "uint256" }], "name": "Approval", "type": "event" }, { "anonymous": false, "inputs": [{ "indexed": true, "internalType": "address", "name": "sender", "type": "address" }, { "indexed": false, "internalType": "uint256", "name": "amount0", "type": "uint256" }, { "indexed": false, "internalType": "uint256", "name": "amount1", "type": "uint256" }, { "indexed": true, "internalType": "address", "name": "to", "type": "address" }], "name": "Burn", "type": "event" }, { "anonymous": false, "inputs": [{ "indexed": true, "internalType": "address", "name": "sender", "type": "address" }, { "indexed": false, "internalType": "uint256", "name": "amount0", "type": "uint256" }, { "indexed": false, "internalType": "uint256", "name": "amount1", "type": "uint256" }], "name": "Mint", "type": "event" }, { "anonymous": false, "inputs": [{ "indexed": true, "internalType": "address", "name": "sender", "type": "address" }, { "indexed": false, "internalType": "uint256", "name": "amount0In", "type": "uint256" }, { "indexed": false, "internalType": "uint256", "name": "amount1In", "type": "uint256" }, { "indexed": false, "internalType": "uint256", "name": "amount0Out", "type": "uint256" }, { "indexed": false, "internalType": "uint256", "name": "amount1Out", "type": "uint256" }, { "indexed": true, "internalType": "address", "name": "to", "type": "address" }], "name": "Swap", "type": "event" }, { "anonymous": false, "inputs": [{ "indexed": false, "internalType": "uint112", "name": "reserve0", "type": "uint112" }, { "indexed": false, "internalType": "uint112", "name": "reserve1", "type": "uint112" }], "name": "Sync", "type": "event" }, { "anonymous": false, "inputs": [{ "indexed": true, "internalType": "address", "name": "from", "type": "address" }, { "indexed": true, "internalType": "address", "name": "to", "type": "address" }, { "indexed": false, "internalType": "uint256", "name": "value", "type": "uint256" }], "name": "Transfer", "type": "event" }, { "constant": true, "inputs": [], "name": "DOMAIN_SEPARATOR", "outputs": [{ "internalType": "bytes32", "name": "", "type": "bytes32" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "MINIMUM_LIQUIDITY", "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "PERMIT_TYPEHASH", "outputs": [{ "internalType": "bytes32", "name": "", "type": "bytes32" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [{ "internalType": "address", "name": "", "type": "address" }, { "internalType": "address", "name": "", "type": "address" }], "name": "allowance", "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [{ "internalType": "address", "name": "spender", "type": "address" }, { "internalType": "uint256", "name": "value", "type": "uint256" }], "name": "approve", "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [{ "internalType": "address", "name": "", "type": "address" }], "name": "balanceOf", "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [{ "internalType": "address", "name": "to", "type": "address" }], "name": "burn", "outputs": [{ "internalType": "uint256", "name": "amount0", "type": "uint256" }, { "internalType": "uint256", "name": "amount1", "type": "uint256" }], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [], "name": "decimals", "outputs": [{ "internalType": "uint8", "name": "", "type": "uint8" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "factory", "outputs": [{ "internalType": "address", "name": "", "type": "address" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "getReserves", "outputs": [{ "internalType": "uint112", "name": "_reserve0", "type": "uint112" }, { "internalType": "uint112", "name": "_reserve1", "type": "uint112" }, { "internalType": "uint32", "name": "_blockTimestampLast", "type": "uint32" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [{ "internalType": "address", "name": "_token0", "type": "address" }, { "internalType": "address", "name": "_token1", "type": "address" }], "name": "initialize", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [], "name": "kLast", "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [{ "internalType": "address", "name": "to", "type": "address" }], "name": "mint", "outputs": [{ "internalType": "uint256", "name": "liquidity", "type": "uint256" }], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [], "name": "name", "outputs": [{ "internalType": "string", "name": "", "type": "string" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [{ "internalType": "address", "name": "", "type": "address" }], "name": "nonces", "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [{ "internalType": "address", "name": "owner", "type": "address" }, { "internalType": "address", "name": "spender", "type": "address" }, { "internalType": "uint256", "name": "value", "type": "uint256" }, { "internalType": "uint256", "name": "deadline", "type": "uint256" }, { "internalType": "uint8", "name": "v", "type": "uint8" }, { "internalType": "bytes32", "name": "r", "type": "bytes32" }, { "internalType": "bytes32", "name": "s", "type": "bytes32" }], "name": "permit", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [], "name": "price0CumulativeLast", "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "price1CumulativeLast", "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [{ "internalType": "address", "name": "to", "type": "address" }], "name": "skim", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [{ "internalType": "uint256", "name": "amount0Out", "type": "uint256" }, { "internalType": "uint256", "name": "amount1Out", "type": "uint256" }, { "internalType": "address", "name": "to", "type": "address" }, { "internalType": "bytes", "name": "data", "type": "bytes" }], "name": "swap", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [], "name": "symbol", "outputs": [{ "internalType": "string", "name": "", "type": "string" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [], "name": "sync", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [], "name": "token0", "outputs": [{ "internalType": "address", "name": "", "type": "address" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "token1", "outputs": [{ "internalType": "address", "name": "", "type": "address" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "totalSupply", "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [{ "internalType": "address", "name": "to", "type": "address" }, { "internalType": "uint256", "name": "value", "type": "uint256" }], "name": "transfer", "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [{ "internalType": "address", "name": "from", "type": "address" }, { "internalType": "address", "name": "to", "type": "address" }, { "internalType": "uint256", "name": "value", "type": "uint256" }], "name": "transferFrom", "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }], "payable": false, "stateMutability": "nonpayable", "type": "function" }]

    const pairAddress = '0x0d4a11d5EEaaC28EC3F61d100daF4d40471f1852';


    const pairContract = new Contract(pairAddress, abi, provider)

    await getReserves(pairContract);
}

async function getReserves(pairContract: Contract) {
    try {
        const reserves = await pairContract.getReserves();
        console.log(reserves);
    } catch (error) {
        console.error('Error fetching reserves:', error);
    }
}

main();

ABIはUniswapV2Pair contractのWETH-USDTのものをさがしてこないといけないみたい。
その探し方は今のところ不明。