Cut Tron Gas Fees by up to 70% — No TRX Needed

/**
 * Minimal TronFuel showcase (build → sign → broadcast → track once)
 * Requirements:
 *   - Node 18+ (has global fetch)
 *   - npm i tronweb
 *   - set env vars: TF_BEARER, TRON_PRIVATE_KEY
 */

import TronWeb from 'tronweb';

const BASE_URL = 'https://tronfuel.dev/api/v1';
const NETWORK  = 'testnet';
const BEARER   = process.env.TF_BEARER || 'Bearer-REDACTED';
const PKEY     = process.env.TRON_PRIVATE_KEY || 'PRIVATE_KEY_REDACTED';

// 1) Build unsigned transaction (TRC20)
const buildRes = await fetch(`${BASE_URL}/transactions/build`, {
  method: 'POST',
  headers: {
    'x-network': NETWORK,
    'authorization': `Bearer ${BEARER}`,
    'content-type': 'application/json'
  },
  body: JSON.stringify({
    type: 'TRC20',
    from: 'TLtHQYAjxk3NGBeWij7EvUtL6P4xt2gngn',
    to:   'TRvH8C7wak5aW5jzMS7s2t1JjEYmhCBWy5',
    contract: 'TXYZopYRdj2D9XRtbG411XZZ3kM5VkAeBf',
    amount: 1
  })
});
const buildJson = await buildRes.json();
const unsignedTx = buildJson.transaction || buildJson.tx || buildJson.data || buildJson;

console.log('[1] Built txID:', unsignedTx?.txID);

// 2) Sign transaction with TronWeb (Nile testnet host)
const tronWeb = new TronWeb({ fullHost: 'https://nile.trongrid.io', privateKey: PKEY });
const signedTx = await tronWeb.trx.sign(unsignedTx, PKEY);

console.log('[2] Signed (sig count):', signedTx?.signature?.length || 0);

// 3) Broadcast signed transaction to TronFuel
const sendRes = await fetch(`${BASE_URL}/transactions`, {
  method: 'POST',
  headers: {
    'x-network': NETWORK,
    'authorization': `Bearer ${BEARER}`,
    'content-type': 'application/json'
  },
  body: JSON.stringify(signedTx)
});
const sendJson = await sendRes.json();
const trackId = sendJson.id || sendJson.transaction_id || sendJson.uuid;

console.log('[3] Broadcast accepted. trackId:', trackId, ' txID:', signedTx.txID);

// 4) Track once by ID in URL params
const trackRes = await fetch(`${BASE_URL}/transactions/${encodeURIComponent(trackId)}`, {
  method: 'GET',
  headers: {
    'x-network': NETWORK,
    'authorization': `Bearer ${BEARER}`,
    'content-type': 'application/json'
  }
});
const trackJson = await trackRes.json();
console.log('[4] Status:', trackJson.status || trackJson?.data?.status || 'unknown');