トークンアカウント (ATA) フィルタリング

import { subscribe, CommitmentLevel, LaserstreamConfig, SubscribeRequest } from 'helius-laserstream';
import bs58 from 'bs58';

const wallet = '<WALLET_PUBKEY>';

const subscriptionRequest: SubscribeRequest = {
  transactions: {
    "wallet-activity": {
      accountInclude: [wallet],
      accountExclude: [],
      accountRequired: [],
      vote: false,
      failed: false,
      tokenAccounts: "balanceChanged" // also match the wallet's ATAs
    }
  },
  commitment: CommitmentLevel.CONFIRMED,
  accounts: {}, slots: {}, transactionsStatus: {},
  blocks: {}, blocksMeta: {}, entry: {}, accountsDataSlice: [],
};

const config: LaserstreamConfig = {
  apiKey: 'YOUR_API_KEY',
  endpoint: 'https://laserstream-mainnet-ewr.helius-rpc.com',
};

await subscribe(config, subscriptionRequest, async (data) => {
  if (!data.transaction?.transaction) return;
  const tx = data.transaction.transaction;
  // Token balances this wallet owns that changed in the tx
  const owned = (tx.meta?.postTokenBalances || []).filter((b: any) => b.owner === wallet);
  console.log(bs58.encode(tx.signature), owned);
}, async (error) => {
  console.error('Stream error:', error);
});

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: 'transactionSubscribe',
    params: [
      {
        accountInclude: ['<WALLET_PUBKEY>'],
        tokenAccounts: 'balanceChanged' // also match the wallet's ATAs
      },
      { commitment: 'confirmed', encoding: 'jsonParsed', maxSupportedTransactionVersion: 0 }
    ]
  }));
  setInterval(() => ws.ping(), 30_000);
});

ws.on('message', (data) => {
  const msg = JSON.parse(data.toString());
  const result = msg.params?.result;
  if (!result) return;
  // Token balances this wallet owns that changed in the tx
  const owned = (result.transaction.meta.postTokenBalances || [])
    .filter((b) => b.owner === '<WALLET_PUBKEY>');
  console.log(result.signature, owned);
});