How do I get lamports sent from a parsed transaction

Question

How do I get the lamports sent in each transaction and why are there multiple transaction accounts on each message? This is the code I have, but 'parsed' is typed as any in the SDK

const getTransactionSummary = (
  fromAddress: ParsedMessageAccount,
  transaction: ParsedTransactionWithMeta
) => {
  const {
    blockTime,
    transaction: { message },
  } = transaction;

  const parsedLamports = message.instructions
    .filter(isParsedInstruction)
    .map(({ parsed }) => parsed.info.lamports);

  return {
    address: fromAddress.pubkey.toBase58(),
    time: blockTime ? new Date(blockTime * 1000).toISOString() : null,
    amount: parsedLamports.reduce(add, 0),
    meta: transaction.meta?.err ?? null,
  };
};```

Answer 1

I think you can use getParsedTransaction function to get preBalance and postBalance of accounts in a transaction. From that you can calculate lamports sent.

  const connection = new Connection(clusterApiUrl('devnet'), { commitment: 'finalized' });

  const signature = "signature of the transaction you want to calculate";
  const txDetail = await connection.getParsedTransaction(signature, {
    commitment: "finalized",
  });
  console.log("account array: ", txDetail.transaction.message.accountKeys)
  console.log("post balances: ", txDetail.meta.postBalances)
  console.log("pre balances: ", txDetail.meta.preBalances)