Uniswap V1 interaction for https://playground.ethers.org/

contract.js

const uniSwapV1FactoryAddress = "0xc0a47dFe034B400B47bDaD5FecDa2621de6c4d95";
const usdcAddress = "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48";
const factoryABI = [
  {
    name: "NewExchange",
    inputs: [
      { type: "address", name: "token", indexed: true },
      { type: "address", name: "exchange", indexed: true },
    ],
    anonymous: false,
    type: "event",
  },
  {
    name: "initializeFactory",
    outputs: [],
    inputs: [{ type: "address", name: "template" }],
    constant: false,
    payable: false,
    type: "function",
    gas: 35725,
  },
  {
    name: "createExchange",
    outputs: [{ type: "address", name: "out" }],
    inputs: [{ type: "address", name: "token" }],
    constant: false,
    payable: false,
    type: "function",
    gas: 187911,
  },
  {
    name: "getExchange",
    outputs: [{ type: "address", name: "out" }],
    inputs: [{ type: "address", name: "token" }],
    constant: true,
    payable: false,
    type: "function",
    gas: 715,
  },
  {
    name: "getToken",
    outputs: [{ type: "address", name: "out" }],
    inputs: [{ type: "address", name: "exchange" }],
    constant: true,
    payable: false,
    type: "function",
    gas: 745,
  },
  {
    name: "getTokenWithId",
    outputs: [{ type: "address", name: "out" }],
    inputs: [{ type: "uint256", name: "token_id" }],
    constant: true,
    payable: false,
    type: "function",
    gas: 736,
  },
  {
    name: "exchangeTemplate",
    outputs: [{ type: "address", name: "out" }],
    inputs: [],
    constant: true,
    payable: false,
    type: "function",
    gas: 633,
  },
  {
    name: "tokenCount",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [],
    constant: true,
    payable: false,
    type: "function",
    gas: 663,
  },
];
const exchangeABI = [
  {
    name: "TokenPurchase",
    inputs: [
      { type: "address", name: "buyer", indexed: true },
      { type: "uint256", name: "eth_sold", indexed: true },
      { type: "uint256", name: "tokens_bought", indexed: true },
    ],
    anonymous: false,
    type: "event",
  },
  {
    name: "EthPurchase",
    inputs: [
      { type: "address", name: "buyer", indexed: true },
      { type: "uint256", name: "tokens_sold", indexed: true },
      { type: "uint256", name: "eth_bought", indexed: true },
    ],
    anonymous: false,
    type: "event",
  },
  {
    name: "AddLiquidity",
    inputs: [
      { type: "address", name: "provider", indexed: true },
      { type: "uint256", name: "eth_amount", indexed: true },
      { type: "uint256", name: "token_amount", indexed: true },
    ],
    anonymous: false,
    type: "event",
  },
  {
    name: "RemoveLiquidity",
    inputs: [
      { type: "address", name: "provider", indexed: true },
      { type: "uint256", name: "eth_amount", indexed: true },
      { type: "uint256", name: "token_amount", indexed: true },
    ],
    anonymous: false,
    type: "event",
  },
  {
    name: "Transfer",
    inputs: [
      { type: "address", name: "_from", indexed: true },
      { type: "address", name: "_to", indexed: true },
      { type: "uint256", name: "_value", indexed: false },
    ],
    anonymous: false,
    type: "event",
  },
  {
    name: "Approval",
    inputs: [
      { type: "address", name: "_owner", indexed: true },
      { type: "address", name: "_spender", indexed: true },
      { type: "uint256", name: "_value", indexed: false },
    ],
    anonymous: false,
    type: "event",
  },
  {
    name: "setup",
    outputs: [],
    inputs: [{ type: "address", name: "token_addr" }],
    constant: false,
    payable: false,
    type: "function",
    gas: 175875,
  },
  {
    name: "addLiquidity",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [
      { type: "uint256", name: "min_liquidity" },
      { type: "uint256", name: "max_tokens" },
      { type: "uint256", name: "deadline" },
    ],
    constant: false,
    payable: true,
    type: "function",
    gas: 82605,
  },
  {
    name: "removeLiquidity",
    outputs: [
      { type: "uint256", name: "out" },
      { type: "uint256", name: "out" },
    ],
    inputs: [
      { type: "uint256", name: "amount" },
      { type: "uint256", name: "min_eth" },
      { type: "uint256", name: "min_tokens" },
      { type: "uint256", name: "deadline" },
    ],
    constant: false,
    payable: false,
    type: "function",
    gas: 116814,
  },
  {
    name: "__default__",
    outputs: [],
    inputs: [],
    constant: false,
    payable: true,
    type: "function",
  },
  {
    name: "ethToTokenSwapInput",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [
      { type: "uint256", name: "min_tokens" },
      { type: "uint256", name: "deadline" },
    ],
    constant: false,
    payable: true,
    type: "function",
    gas: 12757,
  },
  {
    name: "ethToTokenTransferInput",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [
      { type: "uint256", name: "min_tokens" },
      { type: "uint256", name: "deadline" },
      { type: "address", name: "recipient" },
    ],
    constant: false,
    payable: true,
    type: "function",
    gas: 12965,
  },
  {
    name: "ethToTokenSwapOutput",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [
      { type: "uint256", name: "tokens_bought" },
      { type: "uint256", name: "deadline" },
    ],
    constant: false,
    payable: true,
    type: "function",
    gas: 50455,
  },
  {
    name: "ethToTokenTransferOutput",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [
      { type: "uint256", name: "tokens_bought" },
      { type: "uint256", name: "deadline" },
      { type: "address", name: "recipient" },
    ],
    constant: false,
    payable: true,
    type: "function",
    gas: 50663,
  },
  {
    name: "tokenToEthSwapInput",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [
      { type: "uint256", name: "tokens_sold" },
      { type: "uint256", name: "min_eth" },
      { type: "uint256", name: "deadline" },
    ],
    constant: false,
    payable: false,
    type: "function",
    gas: 47503,
  },
  {
    name: "tokenToEthTransferInput",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [
      { type: "uint256", name: "tokens_sold" },
      { type: "uint256", name: "min_eth" },
      { type: "uint256", name: "deadline" },
      { type: "address", name: "recipient" },
    ],
    constant: false,
    payable: false,
    type: "function",
    gas: 47712,
  },
  {
    name: "tokenToEthSwapOutput",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [
      { type: "uint256", name: "eth_bought" },
      { type: "uint256", name: "max_tokens" },
      { type: "uint256", name: "deadline" },
    ],
    constant: false,
    payable: false,
    type: "function",
    gas: 50175,
  },
  {
    name: "tokenToEthTransferOutput",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [
      { type: "uint256", name: "eth_bought" },
      { type: "uint256", name: "max_tokens" },
      { type: "uint256", name: "deadline" },
      { type: "address", name: "recipient" },
    ],
    constant: false,
    payable: false,
    type: "function",
    gas: 50384,
  },
  {
    name: "tokenToTokenSwapInput",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [
      { type: "uint256", name: "tokens_sold" },
      { type: "uint256", name: "min_tokens_bought" },
      { type: "uint256", name: "min_eth_bought" },
      { type: "uint256", name: "deadline" },
      { type: "address", name: "token_addr" },
    ],
    constant: false,
    payable: false,
    type: "function",
    gas: 51007,
  },
  {
    name: "tokenToTokenTransferInput",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [
      { type: "uint256", name: "tokens_sold" },
      { type: "uint256", name: "min_tokens_bought" },
      { type: "uint256", name: "min_eth_bought" },
      { type: "uint256", name: "deadline" },
      { type: "address", name: "recipient" },
      { type: "address", name: "token_addr" },
    ],
    constant: false,
    payable: false,
    type: "function",
    gas: 51098,
  },
  {
    name: "tokenToTokenSwapOutput",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [
      { type: "uint256", name: "tokens_bought" },
      { type: "uint256", name: "max_tokens_sold" },
      { type: "uint256", name: "max_eth_sold" },
      { type: "uint256", name: "deadline" },
      { type: "address", name: "token_addr" },
    ],
    constant: false,
    payable: false,
    type: "function",
    gas: 54928,
  },
  {
    name: "tokenToTokenTransferOutput",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [
      { type: "uint256", name: "tokens_bought" },
      { type: "uint256", name: "max_tokens_sold" },
      { type: "uint256", name: "max_eth_sold" },
      { type: "uint256", name: "deadline" },
      { type: "address", name: "recipient" },
      { type: "address", name: "token_addr" },
    ],
    constant: false,
    payable: false,
    type: "function",
    gas: 55019,
  },
  {
    name: "tokenToExchangeSwapInput",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [
      { type: "uint256", name: "tokens_sold" },
      { type: "uint256", name: "min_tokens_bought" },
      { type: "uint256", name: "min_eth_bought" },
      { type: "uint256", name: "deadline" },
      { type: "address", name: "exchange_addr" },
    ],
    constant: false,
    payable: false,
    type: "function",
    gas: 49342,
  },
  {
    name: "tokenToExchangeTransferInput",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [
      { type: "uint256", name: "tokens_sold" },
      { type: "uint256", name: "min_tokens_bought" },
      { type: "uint256", name: "min_eth_bought" },
      { type: "uint256", name: "deadline" },
      { type: "address", name: "recipient" },
      { type: "address", name: "exchange_addr" },
    ],
    constant: false,
    payable: false,
    type: "function",
    gas: 49532,
  },
  {
    name: "tokenToExchangeSwapOutput",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [
      { type: "uint256", name: "tokens_bought" },
      { type: "uint256", name: "max_tokens_sold" },
      { type: "uint256", name: "max_eth_sold" },
      { type: "uint256", name: "deadline" },
      { type: "address", name: "exchange_addr" },
    ],
    constant: false,
    payable: false,
    type: "function",
    gas: 53233,
  },
  {
    name: "tokenToExchangeTransferOutput",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [
      { type: "uint256", name: "tokens_bought" },
      { type: "uint256", name: "max_tokens_sold" },
      { type: "uint256", name: "max_eth_sold" },
      { type: "uint256", name: "deadline" },
      { type: "address", name: "recipient" },
      { type: "address", name: "exchange_addr" },
    ],
    constant: false,
    payable: false,
    type: "function",
    gas: 53423,
  },
  {
    name: "getEthToTokenInputPrice",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [{ type: "uint256", name: "eth_sold" }],
    constant: true,
    payable: false,
    type: "function",
    gas: 5542,
  },
  {
    name: "getEthToTokenOutputPrice",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [{ type: "uint256", name: "tokens_bought" }],
    constant: true,
    payable: false,
    type: "function",
    gas: 6872,
  },
  {
    name: "getTokenToEthInputPrice",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [{ type: "uint256", name: "tokens_sold" }],
    constant: true,
    payable: false,
    type: "function",
    gas: 5637,
  },
  {
    name: "getTokenToEthOutputPrice",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [{ type: "uint256", name: "eth_bought" }],
    constant: true,
    payable: false,
    type: "function",
    gas: 6897,
  },
  {
    name: "tokenAddress",
    outputs: [{ type: "address", name: "out" }],
    inputs: [],
    constant: true,
    payable: false,
    type: "function",
    gas: 1413,
  },
  {
    name: "factoryAddress",
    outputs: [{ type: "address", name: "out" }],
    inputs: [],
    constant: true,
    payable: false,
    type: "function",
    gas: 1443,
  },
  {
    name: "balanceOf",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [{ type: "address", name: "_owner" }],
    constant: true,
    payable: false,
    type: "function",
    gas: 1645,
  },
  {
    name: "transfer",
    outputs: [{ type: "bool", name: "out" }],
    inputs: [
      { type: "address", name: "_to" },
      { type: "uint256", name: "_value" },
    ],
    constant: false,
    payable: false,
    type: "function",
    gas: 75034,
  },
  {
    name: "transferFrom",
    outputs: [{ type: "bool", name: "out" }],
    inputs: [
      { type: "address", name: "_from" },
      { type: "address", name: "_to" },
      { type: "uint256", name: "_value" },
    ],
    constant: false,
    payable: false,
    type: "function",
    gas: 110907,
  },
  {
    name: "approve",
    outputs: [{ type: "bool", name: "out" }],
    inputs: [
      { type: "address", name: "_spender" },
      { type: "uint256", name: "_value" },
    ],
    constant: false,
    payable: false,
    type: "function",
    gas: 38769,
  },
  {
    name: "allowance",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [
      { type: "address", name: "_owner" },
      { type: "address", name: "_spender" },
    ],
    constant: true,
    payable: false,
    type: "function",
    gas: 1925,
  },
  {
    name: "name",
    outputs: [{ type: "bytes32", name: "out" }],
    inputs: [],
    constant: true,
    payable: false,
    type: "function",
    gas: 1623,
  },
  {
    name: "symbol",
    outputs: [{ type: "bytes32", name: "out" }],
    inputs: [],
    constant: true,
    payable: false,
    type: "function",
    gas: 1653,
  },
  {
    name: "decimals",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [],
    constant: true,
    payable: false,
    type: "function",
    gas: 1683,
  },
  {
    name: "totalSupply",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [],
    constant: true,
    payable: false,
    type: "function",
    gas: 1713,
  },
];
const tokenABI = [
  {
    name: "Transfer",
    inputs: [
      { type: "address", name: "_from", indexed: true },
      { type: "address", name: "_to", indexed: true },
      { type: "uint256", name: "_value", indexed: false },
    ],
    anonymous: false,
    type: "event",
  },
  {
    name: "Approval",
    inputs: [
      { type: "address", name: "_owner", indexed: true },
      { type: "address", name: "_spender", indexed: true },
      { type: "uint256", name: "_value", indexed: false },
    ],
    anonymous: false,
    type: "event",
  },
  {
    name: "__init__",
    outputs: [],
    inputs: [
      { type: "bytes32", name: "_name" },
      { type: "bytes32", name: "_symbol" },
      { type: "uint256", name: "_decimals" },
      { type: "uint256", name: "_supply" },
    ],
    constant: false,
    payable: false,
    type: "constructor",
  },
  {
    name: "deposit",
    outputs: [],
    inputs: [],
    constant: false,
    payable: true,
    type: "function",
    gas: 74279,
  },
  {
    name: "withdraw",
    outputs: [{ type: "bool", name: "out" }],
    inputs: [{ type: "uint256", name: "_value" }],
    constant: false,
    payable: false,
    type: "function",
    gas: 108706,
  },
  {
    name: "totalSupply",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [],
    constant: true,
    payable: false,
    type: "function",
    gas: 543,
  },
  {
    name: "balanceOf",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [{ type: "address", name: "_owner" }],
    constant: true,
    payable: false,
    type: "function",
    gas: 745,
  },
  {
    name: "transfer",
    outputs: [{ type: "bool", name: "out" }],
    inputs: [
      { type: "address", name: "_to" },
      { type: "uint256", name: "_value" },
    ],
    constant: false,
    payable: false,
    type: "function",
    gas: 74698,
  },
  {
    name: "transferFrom",
    outputs: [{ type: "bool", name: "out" }],
    inputs: [
      { type: "address", name: "_from" },
      { type: "address", name: "_to" },
      { type: "uint256", name: "_value" },
    ],
    constant: false,
    payable: false,
    type: "function",
    gas: 110600,
  },
  {
    name: "approve",
    outputs: [{ type: "bool", name: "out" }],
    inputs: [
      { type: "address", name: "_spender" },
      { type: "uint256", name: "_value" },
    ],
    constant: false,
    payable: false,
    type: "function",
    gas: 37888,
  },
  {
    name: "allowance",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [
      { type: "address", name: "_owner" },
      { type: "address", name: "_spender" },
    ],
    constant: true,
    payable: false,
    type: "function",
    gas: 1025,
  },
  {
    name: "name",
    outputs: [{ type: "bytes32", name: "out" }],
    inputs: [],
    constant: true,
    payable: false,
    type: "function",
    gas: 723,
  },
  {
    name: "symbol",
    outputs: [{ type: "bytes32", name: "out" }],
    inputs: [],
    constant: true,
    payable: false,
    type: "function",
    gas: 753,
  },
  {
    name: "decimals",
    outputs: [{ type: "uint256", name: "out" }],
    inputs: [],
    constant: true,
    payable: false,
    type: "function",
    gas: 783,
  },
];

interaction.js

const gasLimit = 100_000
window.ethereum.request({ method: 'eth_requestAccounts' })
const provider = new ethers.providers.Web3Provider(window.ethereum);
const signer = provider.getSigner();
const walletAddress = await signer.getAddress();

// Create contract instance for Uniswap V1 factory
const factoryContract = new ethers.Contract(
  uniSwapV1FactoryAddress,
  factoryABI,
  provider,
  { gasLimit }
);

// Create contract instance for USDC token
const tokenContract = new ethers.Contract(usdcAddress, tokenABI, provider, { gasLimit });

// Create contract address for USDC swap
const exchangeAddress = await factoryContract.getExchange(usdcAddress, { gasLimit });

// Create contract instance for Uniswap V1 USDC swap
const exchangeContract = new ethers.Contract(
  exchangeAddress,
  exchangeABI,
  provider,
  { gasLimit }
);

const now = Math.floor(new Date().getTime() / 1000)
// Swap for 100 USDC
await exchangeContract.connect(signer).ethToTokenSwapInput(100, now + 10, {
  value: ethers.utils.parseEther("0.2"),
  gasLimit,
});

// Get balance for USDC
const usdcBalance = await tokenContract.balanceOf(walletAddress, { gasLimit });
const decimals = await tokenContract.decimals({ gasLimit });
const formattedBalance = ethers.utils.formatUnits(usdcBalance, decimals)
console.log(`Your USDC balance: ${formattedBalance}`);