Every response says whether the transaction was accepted, or why it was turned away so you can try again.

Response format and error codes

Success Response

json

{
  "status": "accepted",
  "request_id": "550e8400-e29b-41d4-a716-446655440000",
  "signature": "5wH...txSig"
}

The relay returns the transaction signature for immediate confirmation tracking.

Error Code	Description
`tip_missing`	Transaction does not include a tip to FastRelay wallet
`tip_insufficient`	Tip amount below minimum threshold (1,000,000 lamports)
`tip_hidden_in_alt`	Transaction uses Address Lookup Table — cannot verify tip
`jito_tip_missing`	Bundle has no transfer to a Jito tip account (bundles only)
`jito_tip_insufficient`	Jito tip below the 1,000 lamport minimum (bundles only)
`simulate_forbidden`	The simulate parameter must be false
`invalid_api_key`	API key not found or invalid
`rate_limit_exceeded`	Request rate limit exceeded for this API key
`invalid_transaction`	Transaction deserialization failed

json

{
  "status": "rejected",
  "error": "Transaction uses ALT — cannot verify tip"
}