> ## Documentation Index
> Fetch the complete documentation index at: https://docs.walletkit.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Batch transactions

> Batch multiple transactions into a single on-chain transaction

Batching is available for Smart Wallets and each batched transaction is broadcasted on-chain as a single transaction.
<Note> Prerequisite: [Create Wallet](/wallets-api/create-wallet/create-scw)</Note>

<Steps>
  <Step title="Obtain user pincode">
    In your app, ask the user for their wallet's 6-digit pincode.

    <Warning>
      You must never store the user pin on your servers.
    </Warning>
  </Step>

  <Step title="Batch transactions into a single transaction">
    Fill in the transaction details and send it to WalletKit.

    <CodeGroup>
      ```typescript Typescript theme={null}
      import { encodeFunctionData } from "viem";

      const transaction = await wk.transactions.batchSignAndSend({
          network: Network.Base,
          signerWalletAddress: "<walelt address>",
          unsignedTransactions: [{
              to: '0xf175520c52418dfe19c8098071a252da48cd1c19',
              input: encodeFunctionData({
                  abi: erc20ABI,
                  args: ["0x4795cd8f434847eccdf5b62370157a70a7da6a46", 0],
                  functionName: "approve",
              }),
          },
          {
              to: '0xf175520c52418dfe19c8098071a252da48cd1c19',
              input: encodeFunctionData({
                  abi: erc20ABI,
                  args: ["0x4795cd8f434847eccdf5b62370157a70a7da6a46", 0],
                  functionName: "transfer",
              }),
          }],
          userPin: "<user pin>",
      });
      ```

      ```bash Curl theme={null}
      curl --request POST \
        --url https://testnet.walletkit.com/transactions/batch-sign-and-send \
        --header 'X-WalletKit-Project-ID: <Project ID>' \
        --header 'Authorization: Bearer <User Access Token or Your API Key>' \
        --data 
        '{
              "network": "Base",
              "signer_wallet_address": "<wallet address>",
              "unsigned_transactions": [{
                  "to": "0xf175520c52418dfe19c8098071a252da48cd1c19",
                  "input": "0x095ea7b30000000000000000000000004795cd8f434847eccdf5b62370157a70a7da6a460000000000000000000000000000000000000000000000000000000000000000"
              },
              {
                  "to": "0xf175520c52418dfe19c8098071a252da48cd1c19",
                  "input": "0xa9059cbb0000000000000000000000004795cd8f434847eccdf5b62370157a70a7da6a460000000000000000000000000000000000000000000000000000000000000000"
              }],
              "user_pin": "<user pin>"
        }'
      ```
    </CodeGroup>
  </Step>
</Steps>