This quick-start shows the minimum code required to add Sign in with Base and Base Pay to any web page using nothing but the Base Account SDK. No frameworks, no additional libraries.

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1. Install the SDK

npm install @base-org/account

If you prefer a CDN import, you can skip the install step and replace the import line below with:

<script type="module" src="https://cdn.skypack.dev/@base-org/account"></script>

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2. Copy-paste this HTML file

index.html
<!doctype html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>Base Account Quick-start</title>
  </head>
  <body>
    <!-- TODO! Button styles -->
    <button id="signin">Sign in with Base</button>
    <button id="pay" disabled>Pay 5&nbsp;USDC on testnet</button>

    <script type="module">
      import { createBaseAccountSDK, pay, getPaymentStatus } from "@base-org/account";

      // Initialise SDK with the injected provider (the user will be prompted to connect on first call).
      const sdk = createBaseAccountSDK();

      // Optional sign-in step – not required for `pay()`, but useful to get the user address.
       document.getElementById("signin").onclick = async () => {
         await sdk.getProvider().request({ method: "wallet_connect" });
         document.getElementById("pay").disabled = false;
       };

       // One-tap USDC payment (works even if you skip the sign-in button above).
       document.getElementById("pay").onclick = async () => {
         const { id } = await pay({
           amount: "5.00", // USD – SDK quotes equivalent USDC
           to: "0xRecipientAddress",
           testnet: true // set to false or omit for Mainnet
         });

         const { status } = await getPaymentStatus({ id });
         alert(`Payment status: ${status}`);
       };
     </script>
   </body>
 </html>

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3. Serve the file

Any static server will work:

npx serve .
# or
python -m http.server

Open http://localhost:3000, click Sign in with Base (optional) and then Pay, approve the transaction, and you’ve sent 5 USDC on Base Sepolia—done! 🎉

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Next steps