Desenvolva aplicativos de última geração

async function main() {
    const decimals = await contract.methods.decimals().call();
    const balance = await
    contract.methods.balanceOf(fromAddress).call();
    console.log('USDC balance:', balance / (10 ** decimals));
    let value = amount * (10 ** decimals);
    let data = contract.methods.transfer(toAddress, value).encodeABI();
    const transaction = {
      'to': tokenAddress,
      'gas': Web3.utils.toHex(100000),
      'data': data
    };
    const signedTx = await
    web3.eth.accounts.signTransaction(transaction, privatekey);
    return web3.eth.sendSignedTransaction(signedTx.rawTransaction,
    function (error, hash) {
      if (!error) {
        console.log("Tx Hash: ", hash);
      } else {
        console.log("Error sending Tx:", error)
      }
    });
  }

  main().then(receipt => console.log("Tx Receipt:", receipt));

// Facilitate a burn of the specified amount of USDC on the source chain
const burnTx = await ethTokenMessengerContract.methods.depositForBurn(amount, AVAX_DESTINATION_DOMAIN, destinationAddressInBytes32,
USDC_ETH_CONTRACT_ADDRESS).send();

// Hashes burn event transaction log
const transactionReceipt = await
web3.eth.getTransactionReceipt(burnTx.transactionHash);
const eventTopic = web3.utils.keccak256('MessageSent(bytes)');
const log = transactionReceipt.logs.find((l) => l.topics[0] === eventTopic);
const messageBytes = web3.eth.abi.decodeParameters(['bytes'], log.data)[0];
const messageHash = web3.utils.keccak256(messageBytes);

// Request the attestation of the burn event from Circle
let attestationResponse = { status: 'pending' };
while (attestationResponse.status !== 'complete') {
  const response = await
fetch(`https://iris-api-sandbox.circle.com/attestations/${messageHash}`);
  attestationResponse = await response.json();
  await new Promise(r => setTimeout(r, 2000));
}

// Enable USDC to be minted on the destination chain
const receiveTx = await
avaxMessageTransmitterContract.receiveMessage(receivingMessageBytes, signature);

import axios from 'axios';

const options = {
  method: 'POST',
  url: 'https://api.circle.com/v1/w3s/developer/transactions/contractExecution',
  headers: {
    Authorization: 'Bearer ${API_KEY}',
    accept: 'application/json',
    'content-type': 'application/json'
  },
  data: {
    abiFunctionSignature: 'transfer(address,uint256)',
    idempotencyKey: '23c4e3d8-62b1-4dca-a08a-b3f28f4a81bf',
    contractAddress: '',
    feeLevel: 'MEDIUM',
    walletId: '${WALLET_ID}',
    entitySecretCiphertext: '${ENTITY_SECRET_CIPHERTEXT}'
  }
};

try {
  const { data } = await axios.request(options);
  console.log(data);
} catch (error) {
  console.error(error);
}