TRON API and RPC: HTTP, JSON-RPC and Solidity Endpoints

const account = await fetch(`${TRON_API}/wallet/getaccount`, {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    address: 'TRX6Q82wMqWNbCCmJPLz9mR8AZwqvUU2pN',
    visible: true
  })
});

const resources = await fetch(`${TRON_API}/wallet/getaccountresource`, {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    address: 'TRX6Q82wMqWNbCCmJPLz9mR8AZwqvUU2pN',
    visible: true
  })
});

const transaction = await fetch(`${TRON_API}/wallet/createtransaction`, {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    to_address: 'TRX6Q82wMqWNbCCmJPLz9mR8AZwqvUU2pN',
    owner_address: 'TJmmqjb1DK9TTZbQXzRQ2AuA94z4gKAPFh',
    amount: 1000000, // 1 TRX in SUN
    visible: true
  })
});

const broadcast = await fetch(`${TRON_API}/wallet/broadcasttransaction`, {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify(signedTransaction)
});

const latestBlock = await fetch(`${TRON_API}/wallet/getnowblock`);
const block = await latestBlock.json();
console.log('Block number:', block.block_header.raw_data.number);

const block = await fetch(`${TRON_API}/wallet/getblock`, {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    id_or_num: "0000000002FAB1B8", // Block hash or number
    detail: true
  })
});

const contractCall = await fetch(`${TRON_API}/wallet/triggersmartcontract`, {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    contract_address: 'TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t', // USDT contract
    function_selector: 'balanceOf(address)',
    parameter: '0000000000000000000000004142b5e01c8c59a25d78acdbec2bfc7e89e5e863',
    owner_address: 'TJmmqjb1DK9TTZbQXzRQ2AuA94z4gKAPFh',
    visible: true
  })
});

// TRC20 USDT Contract
const USDT_CONTRACT = 'TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t';

// Get USDT balance
async function getUSDTBalance(address) {
  const { constant_result } = await tronWeb.transactionBuilder.triggerConstantContract(
    USDT_CONTRACT,
    'balanceOf(address)',
    {},
    [{type: 'address', value: address}]
  );

  return tronWeb.toDecimal('0x' + constant_result[0]) / 1e6;
}

// Transfer USDT
async function transferUSDT(to, amount) {
  const contract = await tronWeb.contract().at(USDT_CONTRACT);
  const tx = await contract.transfer(to, amount * 1e6).send();
  return tx;
}

// Freeze TRX for energy
async function freezeForEnergy(amount) {
  const tx = await tronWeb.transactionBuilder.freezeBalance(
    amount * 1e6, // Amount in SUN
    3, // Duration in days
    'ENERGY',
    ownerAddress
  );
  const signed = await tronWeb.trx.sign(tx);
  return await tronWeb.trx.broadcast(signed);
}

// Get account resources
async function getResources(address) {
  const resources = await tronWeb.trx.getAccountResources(address);
  return {
    bandwidth: resources.freeNetLimit + (resources.NetLimit || 0),
    energy: resources.EnergyLimit || 0,
    freeTransactions: resources.freeNetUsed < resources.freeNetLimit
  };
}

// JustSwap V2 Router
const JUSTSWAP_ROUTER = 'TKzxdSv2FZKQrEqkKVgp5DcwEXBEKMg2Ax';

// Swap TRX for USDT
async function swapTRXforUSDT(amountTRX) {
  const contract = await tronWeb.contract().at(JUSTSWAP_ROUTER);

  const path = [
    'TNUC9Qb1rRpS5CbWLmNMxXBjyFoydXjWFR', // WTRX
    'TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t'  // USDT
  ];

  const tx = await contract.swapExactETHForTokens(
    0, // Min amount out
    path,
    userAddress,
    Date.now() + 60000 // Deadline
  ).send({
    callValue: amountTRX * 1e6
  });

  return tx;
}

// Sign transaction locally
async function signTransaction(transaction, privateKey) {
  const tronWeb = new TronWeb({
    fullHost: 'https://api-tron-mainnet.n.dwellir.com/YOUR_API_KEY',
    privateKey: privateKey
  });

  const signedTx = await tronWeb.trx.sign(transaction);
  return signedTx;
}

// Multi-signature transaction
async function multiSigTransaction(transaction, privateKeys) {
  let signedTx = transaction;

  for (const key of privateKeys) {
    const tronWeb = new TronWeb({
      fullHost: 'https://api-tron-mainnet.n.dwellir.com/YOUR_API_KEY',
      privateKey: key
    });
    signedTx = await tronWeb.trx.multiSign(signedTx);
  }

  return signedTx;
}

class TronAPIError extends Error {
  constructor(message, code) {
    super(message);
    this.code = code;
  }
}

async function safeAPICall(url, options) {
  try {
    const response = await fetch(url, options);
    const data = await response.json();

    if (data.Error) {
      throw new TronAPIError(data.Error, data.code);
    }

    return data;
  } catch (error) {
    if (error.code === 'BANDWIDTH_ERROR') {
      console.error('Insufficient bandwidth. Consider freezing TRX.');
    } else if (error.code === 'CONTRACT_VALIDATE_ERROR') {
      console.error('Smart contract validation failed.');
    }
    throw error;
  }
}

class RateLimiter {
  constructor(maxRequests = 10, interval = 1000) {
    this.maxRequests = maxRequests;
    this.interval = interval;
    this.requests = [];
  }

  async throttle() {
    const now = Date.now();
    this.requests = this.requests.filter(time => now - time < this.interval);

    if (this.requests.length >= this.maxRequests) {
      const waitTime = this.interval - (now - this.requests[0]);
      await new Promise(resolve => setTimeout(resolve, waitTime));
      return this.throttle();
    }

    this.requests.push(now);
  }
}

const limiter = new RateLimiter(100, 1000); // 100 requests per second

async function apiCall(endpoint, options) {
  await limiter.throttle();
  return fetch(endpoint, options);
}

// Batch transfer to multiple addresses
async function batchTransfer(transfers) {
  const transactions = [];

  for (const { to, amount } of transfers) {
    const tx = await tronWeb.transactionBuilder.sendTrx(
      to,
      amount * 1e6,
      fromAddress
    );
    transactions.push(tx);
  }

  // Sign all transactions
  const signedTxs = await Promise.all(
    transactions.map(tx => tronWeb.trx.sign(tx))
  );

  // Broadcast all transactions
  const results = await Promise.all(
    signedTxs.map(tx => tronWeb.trx.broadcast(tx))
  );

  return results;
}

class TronCache {
  constructor(ttl = 60000) { // 1 minute default TTL
    this.cache = new Map();
    this.ttl = ttl;
  }

  set(key, value) {
    this.cache.set(key, {
      value,
      expiry: Date.now() + this.ttl
    });
  }

  get(key) {
    const item = this.cache.get(key);
    if (!item) return null;

    if (Date.now() > item.expiry) {
      this.cache.delete(key);
      return null;
    }

    return item.value;
  }
}

const cache = new TronCache();

async function getCachedBalance(address) {
  const cached = cache.get(`balance:${address}`);
  if (cached) return cached;

  const balance = await getBalance(address);
  cache.set(`balance:${address}`, balance);
  return balance;
}

// Never expose private keys in code
const privateKey = process.env.TRON_PRIVATE_KEY;

// Use hardware wallets for production
import TronStation from 'tronstation';

async function signWithHardware(transaction) {
  const tronStation = new TronStation();
  const signed = await tronStation.signTransaction(transaction);
  return signed;
}

// Validate addresses
function isValidTronAddress(address) {
  try {
    return TronWeb.isAddress(address);
  } catch {
    return false;
  }
}

async function mintNFT(contractAddress, recipient, tokenURI) {
  const contract = await tronWeb.contract().at(contractAddress);

  const tx = await contract.mint(
    recipient,
    tokenURI
  ).send({
    feeLimit: 100_000_000, // 100 TRX max fee
    shouldPollResponse: true
  });

  return tx;
}

async function acceptUSDTPayment(amount, memo) {
  // Generate unique payment address
  const paymentAddress = await generatePaymentAddress();

  // Monitor for incoming USDT
  const interval = setInterval(async () => {
    const balance = await getUSDTBalance(paymentAddress);

    if (balance >= amount) {
      clearInterval(interval);
      await processPayment(paymentAddress, amount, memo);
    }
  }, 3000); // Check every 3 seconds

  return paymentAddress;
}

async function castVote(proposalId, support, reason) {
  const daoContract = await tronWeb.contract().at(DAO_CONTRACT);

  const tx = await daoContract.castVoteWithReason(
    proposalId,
    support,
    reason
  ).send({
    feeLimit: 50_000_000
  });

  return tx;
}

// Ethereum contract
contract EthereumToken {
    mapping(address => uint256) balances;

    function transfer(address to, uint256 amount) public {
        require(balances[msg.sender] >= amount);
        balances[msg.sender] -= amount;
        balances[to] += amount;
    }
}

// TRON contract (minimal changes)
contract TronToken {
    mapping(address => uint256) balances;

    function transfer(address to, uint256 amount) public {
        require(balances[msg.sender] >= amount);
        balances[msg.sender] = balances[msg.sender].sub(amount);
        balances[to] = balances[to].add(amount);
    }
}