state_subscribeRuntimeVersion

Description

Subscribe to storage or runtime version updates over WebSocket. Drive live UIs that react to on‑chain changes.

Subscribes to runtime version updates. Requires WebSocket.

Code Examples

cURL

Not supported over HTTP; use WebSocket.

JavaScript (polkadot.js)

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

const api = await ApiPromise.create({ provider: new WsProvider('wss://api-bittensor-mainnet.n.dwellir.com/YOUR_API_KEY') });
const unsub = await api.rpc.state.subscribeRuntimeVersion((v) => {
console.log('runtime version:', v.toHuman());
});
// Later: await unsub();