author_submitAndWatchExtrinsic - Bittensor

Example code for the author_submitAndWatchExtrinsic JSON-RPC method. Complete guide on how to use author_submitAndWatchExtrinsic JSON-RPC in GetBlock Web3 documentation.

Submits a signed extrinsic and watches it through inclusion and finalization. Returns a subscription ID; status updates (ready, inBlock, finalized, etc.) arrive as separate WebSocket messages.

Substrate native JSON-RPC method. Call against a GetBlock endpoint configured for the Substrate interface. For typed SDK access, use Polkadot.js (TypeScript) or substrateinterface (Python).

WebSocket-only method. This method requires the WebSocket transport at wss://go.getblock.io/<ACCESS-TOKEN>/. It will not work via HTTP POST.

Parameters

Parameter	Type	Required	Description
extrinsic	string	Yes	Hex-encoded SCALE-serialized signed extrinsic

Request Example

cURL

# WebSocket-only method. Use wscat (or similar) to connect first:
wscat -c 'wss://go.getblock.io/<ACCESS-TOKEN>/'

# Then send:
{"jsonrpc": "2.0", "method": "author_submitAndWatchExtrinsic", "params": ["0x4502840022df56fa4a52f1eb96d4f1a9cdfb4cfbe5e7eb4..."], "id": "getblock.io"}

JavaScript (Axios)

import WebSocket from 'ws';

const ws = new WebSocket('wss://go.getblock.io/<ACCESS-TOKEN>/');

ws.on('open', () => {
    ws.send(JSON.stringify({
    "jsonrpc": "2.0",
    "method": "author_submitAndWatchExtrinsic",
    "params": [
        "0x4502840022df56fa4a52f1eb96d4f1a9cdfb4cfbe5e7eb4..."
    ],
    "id": "getblock.io"
}));
});

ws.on('message', (data) => {
    console.log(JSON.parse(data.toString()));
});

Python (Requests)

import asyncio
import json
import websockets

async def main():
    async with websockets.connect('wss://go.getblock.io/<ACCESS-TOKEN>/') as ws:
        await ws.send(json.dumps({
    "jsonrpc": "2.0",
    "method": "author_submitAndWatchExtrinsic",
    "params": [
        "0x4502840022df56fa4a52f1eb96d4f1a9cdfb4cfbe5e7eb4..."
    ],
    "id": "getblock.io"
}))
        async for message in ws:
            print(json.loads(message))

asyncio.run(main())

Rust (Reqwest)

use tokio_tungstenite::connect_async;
use tokio_tungstenite::tungstenite::Message;
use serde_json::json;
use futures_util::{SinkExt, StreamExt};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let (mut ws_stream, _) = connect_async("wss://go.getblock.io/<ACCESS-TOKEN>/").await?;

    let payload = json!({
        "jsonrpc": "2.0",
        "method": "author_submitAndWatchExtrinsic",
        "params": [
                "0x4502840022df56fa4a52f1eb96d4f1a9cdfb4cfbe5e7eb4..."
        ],
        "id": "getblock.io"
});
    ws_stream.send(Message::Text(payload.to_string())).await?;

    while let Some(msg) = ws_stream.next().await {
        println!("{:?}", msg?);
    }
    Ok(())
}

Response Example

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": "B5cD6eF7gH8iJ9kL0m"
}

Response Parameters

Field	Type	Description
result	string	Subscription ID — incoming notifications carry status transitions

Use Cases

• Wallet UIs showing real-time transaction progress (pending → inBlock → finalized)

• Server-side relayers that need to confirm extrinsic outcomes

• Replacing inefficient polling for receipts

Error Handling

Status Code	Error Message	Cause
403	Forbidden	Missing or invalid <ACCESS-TOKEN>
-32602	Invalid params	Request parameters are missing or malformed
-32601	Method not found	Method does not exist on this interface — check whether you're calling a Substrate method on an EVM endpoint or vice versa
-32603	Internal error	Server-side error while processing the request
429	Too Many Requests	Rate limit exceeded for your plan

SDK Integration

Polkadot.js (TypeScript)

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

const provider = new WsProvider('wss://go.getblock.io/<ACCESS-TOKEN>/');
const api = await ApiPromise.create({ provider });

// Typed wrapper: api.rpc.author.submitAndWatchExtrinsic(...)
const result = await api.rpc.author.submitAndWatchExtrinsic("0x4502840022df56fa4a52f1eb96d4f1a9cdfb4cfbe5e7eb4...");
console.log(result.toHuman());

// Or use the raw RPC interface for any method:
// const raw = await api.rpc.send({ method: 'author_submitAndWatchExtrinsic', params: ["0x4502840022df56fa4a52f1eb96d4f1a9cdfb4cfbe5e7eb4..."] });

substrateinterface (Python)

from substrateinterface import SubstrateInterface

substrate = SubstrateInterface(url="wss://go.getblock.io/<ACCESS-TOKEN>/")

# Generic RPC call:
result = substrate.rpc_request("author_submitAndWatchExtrinsic", ["0x4502840022df56fa4a52f1eb96d4f1a9cdfb4cfbe5e7eb4..."])
print(result)