WebSocket経由でのnotifyOnフィルタリング

const ws = new WebSocket('wss://mainnet.helius-rpc.com/?api-key=<API_KEY>');

ws.on('open', () => {
  ws.send(JSON.stringify({
    jsonrpc: '2.0',
    id: 1,
    method: 'accountSubscribe',
    params: [
      '<ACCOUNT_PUBKEY>',
      {
        encoding: 'jsonParsed',
        commitment: 'confirmed',
        notifyOn: 'write' // skip no-op updates
      }
    ]
  }));
  setInterval(() => ws.ping(), 30_000);
});

ws.on('message', (data) => {
  const msg = JSON.parse(data.toString());
  if (msg.params?.result) console.log(msg.params.result);
});

ws.send(JSON.stringify({
  jsonrpc: '2.0',
  id: 1,
  method: 'programSubscribe',
  params: [
    '<PROGRAM_ID>',
    {
      encoding: 'jsonParsed',
      commitment: 'confirmed',
      filters: [{ dataSize: 165 }],
      notifyOn: 'write' // skip no-op updates
    }
  ]
}));