author_submitExtrinsic - JSON-RPC Method

Description

Broadcasts a signed extrinsic to the Enjin Matrix transaction pool. The node validates the payload and, if valid, gossips it to peers for eventual inclusion in a block. Combine this call with payment_queryInfo to estimate fees and author_pendingExtrinsics or author_submitAndWatchExtrinsic to track status.

Parameters

Parameter	Type	Required	Description
extrinsic	string	Yes	SCALE-encoded, signed extrinsic in hex

Returns

Field	Type	Description
result	string	Transaction hash of the submitted extrinsic

Request Example

{
  "jsonrpc": "2.0",
  "method": "author_submitExtrinsic",
  "params": [
    "0x29028400..."
  ],
  "id": 1
}

Response Example

{
  "jsonrpc": "2.0",
  "error": {
    "code": 1010,
    "message": "Invalid Transaction",
    "data": "Transaction dispatch is mandatory; transactions must not be validated."
  },
  "id": 1
}

Code Examples

cURL

curl https://api-enjin-matrixchain.n.dwellir.com/YOUR_API_KEY \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "author_submitExtrinsic",
    "params": ["SIGNED_EXTRINSIC_HEX"],
    "id": 1
  }'

The RPC rejects stale or replayed extrinsics with error 1010. Generate a fresh signed payload (correct nonce, mortality window, and tip) before broadcasting.

Python

from substrateinterface import Keypair, SubstrateInterface

substrate = SubstrateInterface(
    url="wss://api-enjin-matrixchain.n.dwellir.com/YOUR_API_KEY"
)

keypair = Keypair.create_from_uri('//Alice')
call = substrate.compose_call(
    call_module='Balances',
    call_function='transfer_keep_alive',
    call_params={
        'dest': 'efS1ZdvCHHviX7qnTGZEZQX9Uz3qpibG9L5RpF9niM8ne5RBn',
        'value': 10 ** 18
    }
)
extrinsic = substrate.create_signed_extrinsic(call=call, keypair=keypair)
receipt = substrate.submit_extrinsic(extrinsic, wait_for_inclusion=True)
print(receipt.is_success)

JavaScript

import { ApiPromise, WsProvider } from '@polkadot/api';
import { Keyring } from '@polkadot/keyring';

const provider = new WsProvider('wss://api-enjin-matrixchain.n.dwellir.com/YOUR_API_KEY');
const api = await ApiPromise.create({ provider });

const keyring = new Keyring({ type: 'sr25519' });
const signer = keyring.addFromUri('//Alice');

const tx = api.tx.balances.transferKeepAlive('efS1ZdvCHHviX7qnTGZEZQX9Uz3qpibG9L5RpF9niM8ne5RBn', 1_000_000_000_000_000_000n);
const hash = await tx.signAndSend(signer);

console.log(`Submitted with hash ${hash.toHex()}`);

Submission Checklist

1. Fee estimation – call payment_queryInfo with the signed payload before submission.
2. Correct nonce – fetch via system_accountNextIndex or api.rpc.system.accountNextIndex.
3. Tip & priority – consider adding a tip for latency-sensitive mints or marketplace updates.
4. Monitoring – watch inclusion via author_submitAndWatchExtrinsic or index the hash from block events.