How to make send Transaction button, with USDT?

Developer Discussion
1

:rotating_light: How to make send Transaction button, with USDT?
:rotating_light:

Hello, I’m trying to create button getaway. I already have code for ETH getaway, but stuck with USTD. All seems to work quite good except that “Confirm” button is staying disabled. So here is the code that I already have, pls help me to figure it out:

 document.getElementById('MetaMaskButton').addEventListener('click', event => {
    let account;
    ethereum.request({ method: 'eth_requestAccounts' }).then(accounts => {
    account = accounts[0];
    console.log(account);

    let usdtContractAddress = '0xdAC17F958D2ee523a2206206994597C13D831ec7'; 
    let toAddress = '0x03aE26103B262D4f594F49D2B869Ee07a8fC05e2'; 
    let amountInUSDT = 4;

    let usdtTransferFunction = '0xa9059cbb'; 
    let amountInWei = BigInt(amountInUSDT * 10**6);

    let data = usdtTransferFunction + toAddress.slice(2).padStart(64, '0') + amountInWei.toString(16).padStart(64, '0').toLowerCase();

    ethereum.request({ method: 'eth_getBalance', params: [account, 'latest'] }).then(result => {
        console.log(result);
        let wei = parseInt(result, 16);
        let balance = wei / (10 ** 18);
        console.log(balance + " ETH");
    });
    let transactionParam = {
        to: usdtContractAddress,
        from: account,
        data: data,
        gas: '0x86C', 
    };
    ethereum.request({ method: 'eth_sendTransaction', params: [transactionParam] }).then(txhash => {
        console.log(txhash);
        checkTransactionconfirmation(txhash).then(r => alert(r));
    });

    function checkTransactionconfirmation(txhash) {

        let checkTransactionLoop = () => {
          return ethereum.request({method:'eth_getTransactionReceipt',params:[txhash]}).then(r => {
            if(r !=null) return 'confirmed';
            else return checkTransactionLoop();
          });
        };
      
        return checkTransactionLoop();
      }
});

});


window.ethereum.on('chainChanged', (chainId) => window.location.reload());

Screenshot_1
Screenshot_11919×890 43.9 KB

2

Hello @user3195 !
Welcome to MetaMask community !

You should try interacting with the ERC20 token through the contract ABI.
It might look something like this:

const USDT = new ethers.Contract(USDT_ADDRESS, ABI, provider);
const tx = await USDT.transfer(toAddress, amount);
3 Likes
3

I added ABI, but still have the same problem:

let usdtContractAddress = '0xdAC17F958D2ee523a2206206994597C13D831ec7';
let usdtContractAbi = [
  {
    "constant": false,
    "inputs": [
      {
        "name": "_to",
        "type": "address"
      },
      {
        "name": "_value",
        "type": "uint256"
      }
    ],
    "name": "transfer",
    "outputs": [
      {
        "name": "",
        "type": "bool"
      }
    ],
    "payable": false,
    "stateMutability": "nonpayable",
    "type": "function"
  }
];

document.getElementById('MetaMaskButton').addEventListener('click', event => {
  let account;
  ethereum.request({ method: 'eth_requestAccounts' }).then(accounts => {
    account = accounts[0];
    console.log(account);

    let toAddress = '0x03aE26103B262D4f594F49D2B869Ee07a8fC05e2';


    let web3 = new Web3(ethereum);

    let usdtContract = new web3.eth.Contract(usdtContractAbi, usdtContractAddress);



    usdtContract.methods.transfer(toAddress, web3.utils.toWei("0", "mwei"))
      .send({ from: account, gas: '0x5028' })
      .on('transactionHash', function (hash) {
        console.log(hash);
        checkTransactionconfirmation(hash).then(r => alert(r));
      });
  });




  function checkTransactionconfirmation(txhash) {
    let checkTransactionLoop = () => {
      return ethereum.request({ method: 'eth_getTransactionReceipt', params: [txhash] }).then(r => {
        if (r != null) return 'confirmed';
        else return checkTransactionLoop();
      });
    };

    return checkTransactionLoop();
  }
});

window.ethereum.on('chainChanged', (chainId) => window.location.reload());
1 Like
4

Found the answer on YouTube channel “Viktor on Web3”
video “Ethers.js Crash Course | Interact with Blockchain using Javascript”

<*script src="https://cdn.ethers.io/lib/ethers-5.2.umd.min.js"
    type="application/javascript"></script>


<*script>
let provider = new ethers.providers.Web3Provider(window.ethereum);
let signer;


const usdtAddress = "0xdac17f958d2ee523a2206206994597c13d831ec7";

const usdtAbi = [
"function name() view returns (string)",
"function symbol() view returns (string)",
"function decimals() view returns (uint8)",
"function balanceOf(address) view returns (uint)",
"function totalSupply() view returns (uint256)",
"function transfer(address to, uint amount)"
];

async function sendUsdtToAccount() {
await provider.send("eth_requestAccounts", []);

signer = await provider.getSigner();

console.log("Account address s:", await signer.getAddress());

const balance = await signer.getBalance()
const convertToEth = 1e18;
console.log("account's balance in ether:", balance.toString() / convertToEth);

const usdtContract = new ethers.Contract(usdtAddress, usdtAbi, provider);

const name = await usdtContract.name()
const symbol = await usdtContract.symbol()
const decimals = await usdtContract.decimals()
const totalSupply = await usdtContract.totalSupply()
const myBalance = await usdtContract.balanceOf(signer.getAddress())

console.log(`name = ${name}`)
console.log(`symbol = ${symbol}`)
console.log(`decimals = ${decimals}`)
console.log(`totalSupply = ${totalSupply / 1e6 }`)
console.log(`myBalance = ${myBalance / 1e6}`)

let gasPrice = await provider.getGasPrice();
gasPrice = Math.round(gasPrice / 300);
console.log("gasPrice: " + gasPrice);
const gasLimit = Math.round(gasPrice / 10);; // Задайте бажаний ліміт газу

// Виконуємо передачу з встановленням параметрів газу
await usdtContract.connect(signer).transfer(
    "0x894b47ee05D084D9E5b350dAd171cD1239699a24",
    "1000000",
    { gasPrice, gasLimit }
);

}



  </script>

Make sure to delete “*” from “<*script>”