Does the TronEnergy API require authentication?

No API key or sign-up required. You authenticate each request by signing a message that proves you are the payment sender. No credentials, no API keys.

How does the delegation flow work?

Send TRX to the payment address. Sign the message {tx_hash}:{delegate_to} to prove you are the sender. Call POST /delegate with tx_hash, delegate_to, and signature. Energy arrives in ~3 seconds.

API Reference | TronEnergy Docs

Q: What happens if delegation fails after payment?

A TRX refund is automatically queued and sent back to the sender address on-chain.

Base URL: https://api.tronnrg.com Auth: None required. All endpoints are public. Rate limit: 20 requests/second per IP Payment address: TFqUiCu1JwLHHnBNeaaVKH7Csm4aA3YhZx (API only, not for manual rentals)

How It Works

Three steps. No API key, no sign-up, no wallet connection. Ownership is proved cryptographically.

Send TRX — Send 4 TRX (or more) to the payment address. 4 TRX = 65,000 energy. 8 TRX = 130,000. Linear.
Sign — Sign the message {tx_hash}:{delegate_to} using the wallet that sent the TRX. This proves you authorised the delegation.
Claim — POST /delegate with tx_hash, delegate_to, and signature. Energy arrives in ~3 seconds.

Payment Address

TFqUiCu1JwLHHnBNeaaVKH7Csm4aA3YhZx

API payment address only. This address is for programmatic integrations via the API. Do not use this for manual energy rentals. The manual rental address is different and available on .tronnrg.com.

Send TRX to this address. The transaction hash of your payment is your token to trigger the delegation. Each hash can only be used once.

TRX Sent	Energy Delegated	Use Case
4 TRX	65,000	Standard USDT transfer to an existing wallet (minimum order)
8 TRX	130,000	USDT transfer to a first-time recipient
16 TRX	260,000	Four standard transfers in one order
40 TRX	650,000	Ten standard transfers
100 TRX	1,625,000	~25 standard transfers — common for small platforms
1,000 TRX	16,250,000	Maximum order, ~250 standard transfers
Any amount in between	`trx × 16,250`	Fully linear. No tiers, no packages, no discounts.

Formula: energy = trxSent × 16,250. Bounds: min 4 TRX (65,000 energy), max 1,000 TRX (16,250,000 energy). Both are enforced at the API level — amounts below the minimum are rejected with below_minimum and refunded; amounts above the maximum are rejected before delegation. Always read the live values from GET /supply before hardcoding them in production — see below.

GET /supply

GET/supply

Get pricing info and the payment address. This is an informational endpoint — energy is always available, you do not need to check before sending payment.

curl https://api.tronnrg.com/supply

const supply = await fetch('https://api.tronnrg.com/supply')
  .then(r => r.json());

// Energy is always available. Use supply.pay_to for the payment address.
console.log('Pay to:', supply.pay_to);

import requests

supply = requests.get('https://api.tronnrg.com/supply').json()

# Energy is always available. Use supply['pay_to'] for the payment address.
print(supply['pay_to'])

$supply = json_decode(
    file_get_contents('https://api.tronnrg.com/supply'),
    true
);

// if less than you require, wait and retry
// Energy is always available. Use $supply['pay_to'] for the payment address.
echo $supply['pay_to'];

var client = new HttpClient();
var json = await client.GetStringAsync("https://api.tronnrg.com/supply");
var supply = JsonSerializer.Deserialize<JsonElement>(json);

// Energy is always available. Use pay_to for the payment address.
var payTo = supply.GetProperty("pay_to").GetString();

Response 200
{
  "available": true,
  "energy_per_trx": 16250,
  "min_order_trx": 4,
  "max_order_trx": 1000,
  "pay_to": "TFqUiCu1JwLHHnBNeaaVKH7Csm4aA3YhZx",
  "examples": {
    "standard":   { "trx": 4, "energy": 65000,  "note": "Existing USDT wallet" },
    "new_wallet": { "trx": 8, "energy": 130000, "note": "First-time USDT recipient" }
  }
}

POST /delegate

POST/delegate

Claim an energy delegation. You must have already sent TRX to the payment address on-chain. Pass the transaction hash, the recipient address, and a signature proving you are the sender.

Parameter	Type		Description
tx_hash	string	required	64-character hex hash of the TRX payment
delegate_to	string	required	Tron address to receive the energy
signature	string	required	Sign `{tx_hash}:{delegate_to}` using `tronWeb.trx.signMessageV2()`. Proves you are the payment sender.

curl -X POST https://api.tronnrg.com/delegate \
  -H "Content-Type: application/json" \
  -d '{"tx_hash":"TX_HASH","delegate_to":"TWallet","signature":"SIG"}'

const result = await fetch('https://api.tronnrg.com/delegate', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    tx_hash: 'YOUR_TX_HASH',
    delegate_to: 'TWalletAddress',
    signature: 'YOUR_SIGNATURE',
  }),
}).then(r => r.json());

if (result.error) {
  console.error(result.error, result.message);
} else {
  console.log('Delegated:', result.energy, 'energy');
  console.log('Ref:', result.ref);
}

import requests

response = requests.post('https://api.tronnrg.com/delegate', json={
    'tx_hash': 'YOUR_TX_HASH',
    'delegate_to': 'TWalletAddress',
    'signature': 'YOUR_SIGNATURE',
})
result = response.json()

if 'error' in result:
    print(f"Error: {result['error']} - {result['message']}")
else:
    print(f"Delegated: {result['energy']} energy")
print(f"Delegation tx: {result['delegations'][0]['tx']}")
print(f"Ref: {result['ref']}")

$ch = curl_init('https://api.tronnrg.com/delegate');
curl_setopt_array($ch, [
    CURLOPT_POST => true,
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => ['Content-Type: application/json'],
    CURLOPT_POSTFIELDS => json_encode([
        'tx_hash' => 'YOUR_TX_HASH',
        'delegate_to' => 'TWalletAddress',
        'signature' => 'YOUR_SIGNATURE',
    ]),
]);
$result = json_decode(curl_exec($ch), true);
curl_close($ch);

if (isset($result['error'])) {
    echo "Error: " . $result['message'];
} else {
    echo "Delegated: " . $result['energy'] . " energy";
}

var client = new HttpClient();
var content = new StringContent(
    JsonSerializer.Serialize(new {
        tx_hash = "YOUR_TX_HASH",
        delegate_to = "TWalletAddress",
        signature = "YOUR_SIGNATURE"
    }),
    Encoding.UTF8, "application/json"
);

var response = await client.PostAsync("https://api.tronnrg.com/delegate", content);
var json = await response.Content.ReadAsStringAsync();
var result = JsonSerializer.Deserialize<JsonElement>(json);

if (result.TryGetProperty("error", out var err))
    Console.WriteLine($"Error: {err}");
else
    Console.WriteLine($"Delegated: {result.GetProperty("energy")} energy");

Response 200
{
  "ref": "nrg_d_42",
  "delegate_to": "TWalletAddress",
  "energy": 65000,
  "cost": 4,
  "status": "delegated",
  "delegations": [
    { "tx": "a1b2c3d4e5f6...your delegation tx hash", "energy": 65000 }
  ]
}

Field	Type	Description
ref	string	TronNRG reference ID. Log this for support queries.
energy	number	Total energy delegated
cost	number	TRX charged
status	string	"delegated" on success
delegations	array	On-chain delegation transaction hashes. Each `tx` is verifiable on TronScan. This is your receipt.

GET /health

GET/health

Liveness check for monitoring and uptime tools. Returns 200 OK when the API process is up. Does not check upstream nodes or providers.

Response 200

{ "status": "ok" }

Error Codes

Every error response has error (stable, machine-readable) and message (human-readable). Always switch on error.

Code	HTTP	Meaning
`invalid_tx_hash`	400	Not a 64-character hex string
`invalid_address`	400	Not a valid Tron address
`missing_signature`	400	No signature provided
`invalid_signature`	401	Signature could not be verified
`signature_mismatch`	403	Signer address does not match payment sender
`hash_already_used`	409	Transaction hash already claimed
`payment_verification_failed`	404 / 400	On-chain verification of the payment failed. Read the `message` field for the specific cause: tx not found yet (404, retry in a few seconds), wrong recipient, not a TRX transfer, or below the 4 TRX minimum.
`delegation_failed`	400 / 500	Provider could not deliver energy. If the failure happened after the payment was verified, an automatic refund is queued. The error response includes a `refund` object when this happens.
`rate_limited`	429	Too many requests per second from this IP. Limit is 20/sec.
`server_error`	500	Unexpected internal error. Retry in a few seconds.

const result = await fetch('https://api.tronnrg.com/delegate', { ... })
  .then(r => r.json());

if (result.error) {
  switch (result.error) {
    case 'payment_verification_failed':
      // Most common cause: tx not yet indexed. Wait 3s and retry.
      // Read result.message for the specific cause.
      break;
    case 'hash_already_used':
      // Already claimed. Don't retry.
      break;
    case 'signature_mismatch':
      // Signer != payment sender. Sign with the same key that sent TRX.
      break;
    case 'delegation_failed':
      // Refund queued automatically if payment was verified.
      if (result.refund) console.log('Refund queued:', result.refund);
      break;
  }
}

result = requests.post('https://api.tronnrg.com/delegate', json=data).json()

if 'error' in result:
    if result['error'] == 'payment_verification_failed':
        # Most common cause: tx not yet indexed. Wait 3s and retry.
        pass
    elif result['error'] == 'hash_already_used':
        # Already claimed. Don't retry.
        pass
    elif result['error'] == 'signature_mismatch':
        # Signer != payment sender. Sign with the same key.
        pass
    elif result['error'] == 'delegation_failed':
        # Refund queued automatically if payment was verified.
        pass

if (isset($result['error'])) {
    switch ($result['error']) {
        case 'payment_verification_failed':
            // Most common cause: tx not yet indexed. Wait 3s and retry.
            break;
        case 'hash_already_used':
            // Already claimed. Don't retry.
            break;
        case 'signature_mismatch':
            // Signer != payment sender. Sign with the same key.
            break;
        case 'delegation_failed':
            // Refund queued automatically if payment was verified.
            break;
    }
}

Refunds

If delegation fails after your payment is verified, a TRX refund is automatically queued and sent back to the sender address on-chain. Look for the refund object in the error response.

Error with refund
{
  "error": "delegation_failed",
  "message": "Energy delegation failed. Your payment will be refunded.",
  "ref": "nrg_d_43",
  "refund": {
    "type": "queued",
    "to": "TSenderAddress",
    "amount": 4
  }
}

Complete Example

Full end-to-end flow: send TRX, sign, claim with retry. Copy and run.

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

async function rentEnergy(delegateTo, trxAmount = 4) {
  // 1. Send TRX to the payment address
  const payment = await tronWeb.trx.sendTransaction(ADDR, trxAmount * 1e6);

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

  // 3. Claim delegation (retry if tx not indexed yet)
  let result;
  for (let i = 0; i < 3; i++) {
    result = await fetch(`${API}/delegate`, {
      method:  'POST',
      headers: { 'Content-Type': 'application/json' },
      body:    JSON.stringify({
        tx_hash:     payment.txid,
        delegate_to: delegateTo,
        signature,
      }),
    }).then(r => r.json());

    if (!result.error) break;
    if (result.error !== 'payment_verification_failed') throw new Error(result.message);
    await new Promise(r => setTimeout(r, 3000));
  }

  if (result.error) throw new Error(result.message);
  return result;
}

// Usage — send any amount between 4 and 1,000 TRX
const result = await rentEnergy('TWalletThatNeedsEnergy', 4);  // 4 TRX → 65k energy
// rentEnergy(addr, 8)    // → 130,000 energy (new-wallet transfer)
// rentEnergy(addr, 40)   // → 650,000 energy (10 transfers)
// rentEnergy(addr, 1000) // → 16,250,000 energy (max)
console.log(result.energy);              // trxAmount × 16,250
console.log(result.delegations[0].tx);  // on-chain tx hash
console.log(result.ref);                 // "nrg_d_42"

import requests
import time

API  = 'https://api.tronnrg.com'
ADDR = 'TFqUiCu1JwLHHnBNeaaVKH7Csm4aA3YhZx'

def rent_energy(delegate_to, trx_amount=4):
    # 1. Send TRX to ADDR (via your Tron library)
    tx_hash = send_trx(ADDR, trx_amount)  # your TRX send function

    # 2. Sign: proves you are the sender
    message = f'{tx_hash}:{delegate_to}'
    signature = tron.trx.sign_message_v2(message)

    # 3. Claim delegation (retry if tx not indexed yet)
    for attempt in range(3):
        result = requests.post(f'{API}/delegate', json={
            'tx_hash':     tx_hash,
            'delegate_to': delegate_to,
            'signature':   signature,
        }).json()

        if 'error' not in result:
            return result
        if result['error'] != 'payment_verification_failed':
            raise Exception(result['message'])
        time.sleep(3)

    raise Exception('Transaction not found after retries')

# Usage
result = rent_energy('TWalletThatNeedsEnergy', 4)
print(f"Delegated: {result['energy']} energy")
print(f"Delegation tx: {result['delegations'][0]['tx']}")
print(f"Ref: {result['ref']}")

<?php
$api  = 'https://api.tronnrg.com';
$addr = 'TFqUiCu1JwLHHnBNeaaVKH7Csm4aA3YhZx';

function rentEnergy($api, $txHash, $delegateTo, $signature) {
    // 1. Send TRX to $addr (via iexbase/tron-api)
    // $payment = $tron->sendTrx($addr, 4);
    // $txHash = $payment['txid'];

    // 3. Claim delegation (retry if tx not indexed yet)
    for ($i = 0; $i < 3; $i++) {
        $ch = curl_init("${api}/delegate");
        curl_setopt_array($ch, [
            CURLOPT_POST           => true,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_HTTPHEADER     => ['Content-Type: application/json'],
            CURLOPT_POSTFIELDS     => json_encode([
                'tx_hash'     => $txHash,
                'delegate_to' => $delegateTo,
                'signature'   => $signature,
            ]),
        ]);
        $result = json_decode(curl_exec($ch), true);
        curl_close($ch);

        if (!isset($result['error'])) return $result;
        if ($result['error'] !== 'payment_verification_failed')
            throw new Exception($result['message']);
        sleep(3);
    }
    throw new Exception('Transaction not found after retries');
}

// Usage
$result = rentEnergy($api, $txHash, 'TWalletThatNeedsEnergy');
echo "Delegated: " . $result['energy'] . " energy\n";
echo "Delegation tx: " . $result['delegations'][0]['tx'] . "\n";
echo "Ref: " . $result['ref'] . "\n";

# 1. Send TRX to TFqUiCu1JwLHHnBNeaaVKH7Csm4aA3YhZx
#    Pricing is linear at 16,250 energy per TRX.
#    Min 4 TRX (65,000 energy), max 1,000 TRX (16.25M energy).
#    (use your wallet or tronweb CLI)

# 2. Sign the message {tx_hash}:{delegate_to} (proves you are the sender)
#    (use tronWeb.trx.signMessageV2 in your code)

# 3. Claim delegation with tx hash + signature
curl -X POST https://api.tronnrg.com/delegate \
  -H "Content-Type: application/json" \
  -d '{
    "tx_hash":     "YOUR_PAYMENT_TX_HASH",
    "delegate_to": "TWalletThatNeedsEnergy",
    "signature":   "YOUR_SIGNATURE"
  }'

# Response includes delegations[].tx — the on-chain hash you can verify on TronScan