author_submitExtrinsic

Description

Submits a fully signed extrinsic to the transaction pool. The node validates the payload against current runtime metadata and, if valid, propagates it to peers.

Parameters

Parameter	Type	Required	Description
extrinsic	string	Yes	SCALE-encoded signed extrinsic (0x-prefixed)

Returns

Field	Type	Description
result	string	Hex-encoded extrinsic hash

Request Example

{
  "jsonrpc": "2.0",
  "method": "author_submitExtrinsic",
  "params": [
    "0x280402000b60e2739f9901d4b3a0e3b88b7c25215926bbf7c733f5c31e69c0c8c4b4a86d6ec3f3f086e95d00"
  ],
  "id": 1
}

Response Example

{
  "jsonrpc": "2.0",
  "result": "0x6dd1dd2b7a1f84c6c44c2ec924a0dd2af429d9d4235ec14debd2994d4c63c9f1",
  "id": 1
}

Code Examples

JavaScript (polkadot.js)

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

const api = await ApiPromise.create({ provider: new WsProvider('wss://api-bifrost-polkadot.n.dwellir.com/YOUR_API_KEY') });
const keyring = new Keyring({ type: 'sr25519' });
const alice = keyring.addFromUri('//Alice');

const tx = api.tx.balances.transferKeepAlive(
  '15mYsj6DpBno58jRoV5HCTiVPFBuWhDLdsWtq3LxwZrfaTEZ',
  1_000_000_000_000n
);

const hash = await tx.signAndSend(alice);
console.log('Extrinsic hash', hash.toHex());

Python (py-substrate-interface)

substrate = SubstrateInterface(
    url='wss://api-bifrost-polkadot.n.dwellir.com/YOUR_API_KEY'
)

call = substrate.compose_call(
    call_module='Balances',
    call_function='transfer_keep_alive',
    call_params={
        'dest': '15mYsj6DpBno58jRoV5HCTiVPFBuWhDLdsWtq3LxwZrfaTEZ',
        'value': 1_000_000_000_000
    }
)

extrinsic = substrate.create_signed_extrinsic(call=call, keypair=alice)
receipt = substrate.submit_extrinsic(extrinsic, wait_for_inclusion=True)
print('Hash:', receipt.extrinsic_hash)

Tips

• Always use the latest metadata (state_getMetadata) to construct calls; outdated metadata leads to 1010: Invalid Transaction.
• Monitor the hash via author_pendingExtrinsics or block inclusion events to confirm broadcast success.