Sign Raw Transaction

API-v2sign_raw_transaction

sign_raw_transaction

The sign_raw_transaction method allows users to:

Create a signed UTXO raw transaction given unsigned hex, and optionally a set of prior transaction inputs.
Create a signed EVM raw transaction, given the destination address, amount, and gas limit.

The transaction can then be broadcast to the network using the send_raw_transaction method to complete the process.

This method is used to sign a raw transaction that has already been created. For UTXO coins, the unsigned hex is required to sign the transaction. If prev_txns is not provided, it will be sourced via Electrum servers.

Request Parameters

Parameter	Type	Required	Description
coin	string	✓	The coin to sign the raw transaction with.
type	string	✓	The operation type. Accepted values: `UTXO` (for UTXO coins), `ETH` (for EVM coins).
tx	object	✓	A standard RawTxInfo object.

Response Parameters

Parameter	Type	Description
tx_hex	string	The signed transaction hex, ready for broadcast.

📌 Examples

Sign UTXO Raw Transaction Hex

Sign UTXO Raw Transaction

POST

sign_raw_transaction

{
  "userpass": "RPC_UserP@SSW0RD",
  "mmrpc": "2.0",
  "method": "sign_raw_transaction",
  "params": {
    "coin": "KMD",
    "type": "UTXO",
    "tx": {
      "tx_hex": "0400008085202f8901c8d6d8764e51bbadc0592b99f37b3b7d8c9719686d5a9bf63652a0802a1cd0360200000000feffffff0100dd96d8080000001976a914d346067e3c3c3964c395fee208594790e29ede5d88ac46366665000000000000000000000000000000"
    }
  },
  "id": 0
}

Sign UTXO Raw Transaction Hex with Inputs

Sign UTXO Raw Transaction with Inputs

POST

sign_raw_transaction

{
  "userpass": "RPC_UserP@SSW0RD",
  "mmrpc": "2.0",
  "id": 0,
  "method": "sign_raw_transaction",
  "params": {
    "coin": "KMD",
    "type": "UTXO",
    "tx": {
      "tx_hex": "0400008085202f8901c8d6d8764e51bbadc0592b99f37b3b7d8c9719686d5a9bf63652a0802a1cd0360200000000feffffff0100dd96d8080000001976a914d346067e3c3c3964c395fee208594790e29ede5d88ac46366665000000000000000000000000000000",
      "prev_txns": [
        {
          "tx_hash": "36d01c2a80a05236f69b5a6d6819978c7d3b7bf3992b59c0adbb514e76d8d6c8",
          "index": 2,
          "script_pub_key": "76a914d346067e3c3c3964c395fee208594790e29ede5d88ac",
          "amount": 0.00001
        }
      ]
    }
  }
}

Sign ETH/EVM Raw Transaction

POST

sign_raw_transaction

{
  "userpass": "RPC_UserP@SSW0RD",
  "mmrpc": "2.0",
  "id": 0,
  "method": "sign_raw_transaction",
  "params": {
    "coin": "MATIC",
    "type": "ETH",
    "tx": {
      "to": "0x927DaFDDa16F1742BeFcBEAE6798090354B294A9",
      "value": "0.85",
      "gas_limit": "21000",
      "pay_for_gas": {
        "tx_type": "Eip1559",
        "max_fee_per_gas": "1234.567",
        "max_priority_fee_per_gas": "1.2"
      }
    }
  }
}

Once you have signed the raw transaction, do not forget to broadcast it to the network using the send_raw_transaction method.

Error Types

Parameter	Type	Description
SigningError	string	Error when signing a raw transaction that belongs to a different key pair
InvalidRequest	string	Error parsing request: invalid digit found in string
InvalidParam	string	Invalid parameter: Invalid input length
NoSuchCoin	string	Coin does not exist or has not been activated

On this page

Sign Raw Transaction

Sign UTXO Raw Transaction

Sign UTXO Raw Transaction with Inputs

Sign ETH/EVM Raw Transaction