ts-sdk-transactions

TypeScript SDK: Transactions

Purpose

Guide building, signing, submitting, and simulating transactions with @aptos-labs/ts-sdk. Use the build → sign → submit → wait pattern; optionally simulate before submit.

ALWAYS

1. Call aptos.waitForTransaction({ transactionHash }) after submit – do not assume transaction is committed after signAndSubmitTransaction.
2. Use aptos.transaction.build.simple() for entry function payloads – pass sender and data: { function, functionArguments, typeArguments? }.
3. Simulate before submit for critical/high-value flows – use aptos.transaction.simulate.simple() and check success and vm_status.
4. Use the same Account instance for signer that you use for sender address when building (e.g. account.accountAddress as sender, account as signer).

NEVER

1. Do not skip waitForTransaction – submission returns when the tx is accepted, not when it is committed.
2. Do not use deprecated scriptComposer (removed in v6) – use separate transactions or batch patterns.
3. Do not use number for u64/u128/u256 in functionArguments – use bigint where required to avoid precision loss.

---

Standard flow (simple transaction)

import { Aptos, AptosConfig, Network } from "@aptos-labs/ts-sdk";

const aptos = new Aptos(new AptosConfig({ network: Network.TESTNET }));
const MODULE_ADDRESS = "0x...";

// 1. Build
const transaction = await aptos.transaction.build.simple({
  sender: account.accountAddress,
  data: {
    function: `${MODULE_ADDRESS}::counter::increment`,
    functionArguments: []
  }
});

// 2. Sign and submit
const pendingTx = await aptos.signAndSubmitTransaction({
  signer: account,
  transaction
});

// 3. Wait for commitment
const committedTx = await aptos.waitForTransaction({
  transactionHash: pendingTx.hash
});

if (!committedTx.success) {
  throw new Error(`Tx failed: ${committedTx.vm_status}`);
}

---

Build options

// With type arguments (e.g. coin type)
const transaction = await aptos.transaction.build.simple({
  sender: account.accountAddress,
  data: {
    function: "0x1::coin::transfer",
    typeArguments: ["0x1::aptos_coin::AptosCoin"],
    functionArguments: [recipientAddress, amount]
  }
});

// Optional: max gas, expiry, etc. (see SDK types for full options)
const transactionWithOptions = await aptos.transaction.build.simple({
  sender: account.accountAddress,
  data: { function: "...", functionArguments: [] },
  options: {
    maxGasAmount: 2000n,
    gasUnitPrice: 100n,
    expireTimestamp: BigInt(Math.floor(Date.now() / 1000) + 600)
  }
});