chain_subscribeFinalizedHeads - JSON-RPC Method

Description

Subscribe to finalized block headers. Requires WebSocket.

Examples

WebSocket (raw JSON-RPC)

const ws = new WebSocket('wss://api-acala.n.dwellir.com/YOUR_API_KEY');
ws.onopen = () => {
  ws.send(JSON.stringify({
    jsonrpc: '2.0',
    id: 1,
    method: 'chain_subscribeFinalizedHeads',
    params: []
  }));
};
ws.onmessage = (e) => console.log(JSON.parse(e.data));

TypeScript (@polkadot/api)

const unsub = await api.rpc.chain.subscribeFinalizedHeads((h) => {
  console.log(`finalized #${h.number}`);
});