What TronWeb version is required?

TronWeb 6.x or later. Install via npm install tronweb. Note that the import is destructured: const { TronWeb } = require("tronweb").

Why does the signature have to come from the same wallet that sent TRX?

It is the API's only proof that you authorized the delegation. Without it, anyone watching the chain could claim energy for any payment.

TronWeb Integration | TronEnergy Docs

Complete Node.js integration using TronWeb. Each step is a standalone code block you can copy into your project. The full end-to-end example is at the bottom.

Prerequisites: Node.js 18+, tronweb installed (npm install tronweb), a funded Tron wallet.

The Flow

No API key. No sign-up. Your code sends TRX on-chain to the TronEnergy payment address, signs a message proving ownership, then claims the delegation. Energy arrives in approximately 3 seconds. Then your code sends USDT using the delegated energy.

Pricing is linear: 16,250 Energy per TRX. Minimum order 4 TRX (65,000 Energy — one standard USDT transfer), maximum 1,000 TRX (16.25M Energy). The amount you send determines exactly how much Energy comes back — there are no tiers or packages. For a single standard transfer, send 4. For a new-wallet transfer, send 8. For batch work, send more. The code below uses a trxAmount variable so you can change it in one place.

Step by Step

1. Setup

setup

    const { TronWeb } = require('tronweb'); // destructured: the default import is broken in v6
    
    const tronWeb = new TronWeb({
      fullHost: 'https://api.trongrid.io',
      privateKey: process.env.TRON_PRIVATE_KEY,
    });
    
    const API  = 'https://api.tronnrg.com';
    const ADDR = 'TFqUiCu1JwLHHnBNeaaVKH7Csm4aA3YhZx'; // API payment address
    const USDT = 'TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t';
  

2. Send TRX

send payment

    const TRX_AMOUNT = 4; // Linear: 16,250 energy per TRX. Min 4, max 1000.
    // 4 → 65k (standard) · 8 → 130k (new wallet) · 40 → 650k (10 transfers)
    
    const payment = await tronWeb.trx.sendTransaction(ADDR, TRX_AMOUNT * 1e6);
    
    console.log('Payment tx:', payment.txid);

3. Claim the Delegation

claim delegation

    // Sign: proves you are the sender
    const msg = `${payment.txid}:${tronWeb.defaultAddress.base58}`;
    const sig = await tronWeb.trx.signMessageV2(msg);

    const delegation = await fetch(`${API}/delegate`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        tx_hash: payment.txid,
        delegate_to: tronWeb.defaultAddress.base58,
        signature: sig,
      }),
    }).then(r => r.json());
    
    if (delegation.error) {
      throw new Error(delegation.message);
    }
    
    console.log('Energy delegated:', delegation.energy); // TRX_AMOUNT × 16,250
  

4. Send USDT

send usdt

    const contract = await tronWeb.contract().at(USDT);
    const tx = await contract.transfer(
      recipientAddress, Math.round(usdtAmount * 1e6)
    ).send({ feeLimit: 50_000_000 });
    
    console.log('USDT sent:', tx);
  

Error Handling

handling errors

    const result = await fetch(`${API}/delegate`, { ... })
      .then(r => r.json());
    
    if (result.error) {
      switch (result.error) {
        case 'payment_verification_failed':
          // Payment not yet indexed on-chain. Wait 3s and retry.
          break;
        case 'hash_already_used':
          // Already claimed. Don't retry.
          break;
        case 'signature_mismatch':
          // Sender of TRX != signer of the message. Sign with the same key.
          break;
        case 'delegation_failed':
          // Provider could not deliver. Retry or contact support with result.ref.
          break;
      }
    }
  

Complete Example

Copy this into a file, set your environment variables, and run it. The script sends TRX, signs the message, claims the delegation with retry, then sends USDT.

delegate-energy.js

const { TronWeb } = require('tronweb'); // destructured: default import is broken in v6

const tronWeb = new TronWeb({
  fullHost: 'https://api.trongrid.io',
  privateKey: process.env.TRON_PRIVATE_KEY,
});

const API  = 'https://api.tronnrg.com';
const ADDR = 'TFqUiCu1JwLHHnBNeaaVKH7Csm4aA3YhZx';
const USDT = 'TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t';

async function claimWithRetry(txHash, delegateTo, signature, retries = 3) {
  for (let i = 0; i < retries; i++) {
    const res = await fetch(`${API}/delegate`, {
      method:  'POST',
      headers: { 'Content-Type': 'application/json' },
      body:    JSON.stringify({ tx_hash: txHash, delegate_to: delegateTo, signature }),
    }).then(r => r.json());

    if (!res.error) return res;
    if (res.error !== 'payment_verification_failed') throw new Error(res.message);
    await new Promise(r => setTimeout(r, 3000));
  }
  throw new Error('Transaction not found after retries');
}

async function main() {
  const recipient  = 'TRecipientWallet';
  const trxAmount = 4; // min 4, max 1000 — you get trxAmount × 16,250 energy

  // 1. Send TRX (linear pricing: 16,250 energy per TRX)
  const payment = await tronWeb.trx.sendTransaction(ADDR, trxAmount * 1e6);
  console.log('Payment:', payment.txid);

  // 2. Claim delegation
  // Sign: proves you are the sender
  const message = `${payment.txid}:${recipient}`;
  const signature = await tronWeb.trx.signMessageV2(message);

  const result = await claimWithRetry(payment.txid, recipient, signature);
  console.log('Delegated:', result.energy, 'energy');
  console.log('Delegation tx:', result.delegations[0].tx);  // verify on TronScan
  console.log('Ref:', result.ref);

  // 3. Send USDT
  const contract = await tronWeb.contract().at(USDT);
  const tx = await contract.transfer(recipient, 10 * 1e6).send();
  console.log('USDT sent:', tx);
}

main().catch(console.error);

Always include the signature. It proves you are the wallet that sent the TRX. Without it, the API rejects the request with missing_signature. The signature is what makes the API safe to use without an API key: it cryptographically proves you authorised the delegation.