chain_subscribeFinalizedHeads - Mythos RPC Method

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

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

// Subscribe to finalized heads
const unsubscribe = await api.rpc.chain.subscribeFinalizedHeads((header) => {
  console.log(`Finalized block #${header.number}`);
  console.log(`  Hash: ${header.hash.toHex()}`);

  // Safe to consider this block permanent
  processConfirmedBlock(header);
});

// Later: unsubscribe()

import asyncio
import websockets
import json

async def subscribe_finalized():
    uri = 'wss://api-mythos-archive.n.dwellir.com/YOUR_API_KEY'

    async with websockets.connect(uri) as ws:
        await ws.send(json.dumps({
            'jsonrpc': '2.0',
            'method': 'chain_subscribeFinalizedHeads',
            'params': [],
            'id': 1
        }))

        response = json.loads(await ws.recv())
        sub_id = response['result']
        print(f'Subscribed to finalized heads: {sub_id}')

        while True:
            message = json.loads(await ws.recv())
            if 'params' in message:
                header = message['params']['result']
                block_num = int(header['number'], 16)
                print(f"Finalized: #{block_num}")

asyncio.run(subscribe_finalized())