Error Codes | TronEnergy Docs

Every error response has two fields: error (machine-readable, stable, never changes between versions) and message (human-readable, may be improved over time). Always switch on error in your code. Display message to users.

Error Format

All error responses follow the same structure:

error response

    {
      "error": "error_code_here",
      "message": "Human-readable explanation"
    }
  

Some errors include additional fields: ref (a reference ID for the delegation attempt) and refund (details about an automatic refund).

Validation Errors

Error Code	HTTP	Cause	Resolution
`invalid_tx_hash`	400	tx_hash is not a 64-character hex string	Check the hash format. Must be exactly 64 hex characters, no prefix.
`invalid_address`	400	delegate_to is not a valid Tron address	Validate the address with TronWeb.isAddress() before calling.
`missing_signature`	400	No signature provided in the request	Sign the message `{tx_hash}:{delegate_to}` with `tronWeb.trx.signMessageV2()` from the wallet that sent the TRX.
`invalid_signature`	401	Signature could not be verified	Ensure you signed exactly `{tx_hash}:{delegate_to}` (lowercase hex hash, colon, exact Tron address).
`signature_mismatch`	403	Signer address does not match the payment sender	The signature must come from the same wallet that sent the TRX payment. Different wallet = rejected.

Payment Errors

Error Code	HTTP	Cause	Resolution
`payment_verification_failed`	404 / 400	The on-chain payment could not be verified. The `message` field describes the specific cause.	Common causes: tx not yet confirmed (wait 3-5 seconds and retry once), wrong recipient address, transaction is not a TRX transfer, below the 4 TRX minimum.
`hash_already_used`	409	This tx hash has already been claimed	Each payment hash can only be used once. Send a new payment for a new delegation.

Service Errors

Error Code	HTTP	Cause	Resolution
`delegation_failed`	400 / 500	Provider could not deliver the energy delegation	If the failure happened after your payment was verified, an automatic refund is queued. Check the `refund` object. Otherwise retry, or contact support with the `ref` ID.
`rate_limited`	429	Too many requests from this IP	Slow down and retry. Limit is 20 requests per second.
`server_error`	500	Unexpected internal error	Retry after a few seconds. If persistent, contact support with the `ref` if available.

Handling Errors in Code

recommended error handling

    const result = await fetch('https://api.tronnrg.com/delegate', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ tx_hash: hash, delegate_to: addr, signature: sig }),
    }).then(r => r.json());
    
    if (result.error) {
      switch (result.error) {
        case 'payment_verification_failed':
          // Most common: tx not yet indexed. Wait 3s and retry once.
          await new Promise(r => setTimeout(r, 3000));
          return retry(hash, addr);
    
        case 'hash_already_used':
          // Already claimed. Don't retry.
          throw new Error('Duplicate delegation attempt');
    
        case 'signature_mismatch':
          // Signer != payment sender. Sign with the same key.
          throw new Error('Signer does not match payment sender');
    
        case 'delegation_failed':
          // Refund queued automatically if payment was verified.
          if (result.refund) console.log('Refund queued:', result.refund);
          break;
    
        default:
          console.error(result.error, result.message);
      }
      return;
    }
    
    // Success
    console.log('Delegated:', result.energy, 'energy');
  console.log('Delegation tx:', result.delegations[0].tx);  // verify on TronScan
  console.log('Ref:', result.ref);
  