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Overview

Smart accounts (ERC-4337) are smart contract wallets that unlock account abstraction features for your users:
  • Batch multiple calls in a single action
  • Optional gas sponsorship via paymasters (gasless UX)
This guide shows how to enable smart accounts in Embedded Wallets, send user operations, and integrate a paymaster.
If you’re new to Embedded Wallets, start with the Quickstart and React Hooks first.
Embedded Wallets do not support the Policy Engine. Embedded Wallets can use Paymaster allowlists today; Smart Account spend permissions are coming soon.

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Prerequisites

  • A CDP Portal account and project
  • Node.js 22+ and a package manager (npm, pnpm, or yarn)
  • Basic familiarity with React and TypeScript
  • A CDP project with Embedded Wallets enabled
  • Your app domain allowlisted
  • @coinbase/cdp-core and @coinbase/cdp-hooks installed
# npm
npm install @coinbase/cdp-core @coinbase/cdp-hooks

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Enable smart accounts

Configure the CDPHooksProvider to create a smart account for new users on sign in. 
import { CDPHooksProvider } from "@coinbase/cdp-hooks";

function App() {
  return (
    <CDPHooksProvider
      config={{
        projectId: "your-project-id",
        ethereum: {
          createOnLogin: "smart", // Automatically create Smart Accounts
        }
      }}
    >
      <YourApp />
    </CDPHooksProvider>
  );
}
  • When ethereum.createOnLogin is set to "smart", new users receive both an EOA and a smart account.
Other config keys supported by the SDK provider:
  • basePath (API base URL override)
  • useMock (local mock mode)
  • debugging (verbose logging)

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Access the user’s smart account

Use useCurrentUser to access the authenticated user’s accounts. The first smart account is available as currentUser.evmSmartAccounts?.[0]. 
import { useCurrentUser } from "@coinbase/cdp-hooks";

function SmartAccountBadge() {
  const { currentUser } = useCurrentUser();
  const smartAccount = currentUser?.evmSmartAccounts?.[0];
  if (!currentUser) return <div>Please sign in</div>;

  return (
    <div>
      <p>Owner EOA: {currentUser.evmAccounts?.[0]}</p>
      {smartAccount && <p>Smart Account: {smartAccount}</p>}
    </div>
  );
}
Alternatively, use useEvmAddress() to get the primary EVM address; it returns the smart account if one exists, otherwise the EOA.

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Send a user operation

Smart accounts submit ERC-4337 user operations rather than standard EOA transactions. Use useSendUserOperation to submit one or more calls. This hook returns status, data, and error values which you can use to track the status of the user operation.
For gas sponsorship with a Paymaster, either set useCdpPaymaster: true (uses the CDP Paymaster on Base) or provide a custom paymasterUrl.
import { useSendUserOperation, useCurrentUser } from "@coinbase/cdp-hooks";

function SendUserOperation() {
  const { sendUserOperation, status, data, error } = useSendUserOperation();
  const { currentUser } = useCurrentUser();

  const handleSendUserOperation = async () => {
    const smartAccount = currentUser?.evmSmartAccounts?.[0];
    if (!smartAccount) return;

    try {
      // This will automatically start tracking the user operation status
      const result = await sendUserOperation({
        evmSmartAccount: smartAccount,
        network: "base-sepolia",
        calls: [{
          to: "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
          value: 1000000000000000000n,
          data: "0x",
        }],
        // Optional gas sponsorship
        // useCdpPaymaster: true,
        // or provide your own paymasterUrl
        // paymasterUrl: "https://your-paymaster.example.com",
      });

      console.log("User Operation Hash:", result.userOperationHash);
    } catch (error) {
      console.error("Failed to send user operation:", error);
    }
  };

  return (
    <div>
      {status === "idle" && <p>Ready to send user operation</p>}
      
      {status === "pending" && (
        <div>
          <p>User operation pending...</p>
          {data && <p>User Op Hash: {data.userOpHash}</p>}
        </div>
      )}
      
      {status === "success" && data && (
        <div>
          <p>User operation successful!</p>
          <p>Transaction Hash: {data.transactionHash}</p>
          <p>Status: {data.status}</p>
        </div>
      )}
      
      {status === "error" && (
        <div>
          <p>User operation failed</p>
          <p>Error: {error?.message}</p>
        </div>
      )}
      
      <button onClick={handleSendUserOperation} disabled={status === "pending"}>
        {status === "pending" ? "Sending..." : "Send User Operation"}
      </button>
    </div>
  );
}

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Batch calls

Provide multiple calls to batch actions in a single user operation. Calls execute in order and revert atomically on failure. 
const { userOperationHash } = await sendUserOperation({
  evmSmartAccount: smartAccount,
  network: "base-sepolia",
  calls: [
    { to: addr1, value: 100000000000000000n },
    { to: addr2, value: 50000000000000000n },
  ],
});

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Encode contract calls

To interact with contracts, pass data using an ABI-encoded payload. This example encodes an ERC-20 transfer using viem: 
import { encodeFunctionData } from "viem";

const erc20Abi = [
  {
    name: "transfer",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [
      { name: "to", type: "address" },
      { name: "value", type: "uint256" },
    ],
    outputs: [{ name: "", type: "bool" }],
  },
];

const data = encodeFunctionData({
  abi: erc20Abi as const,
  functionName: "transfer",
  args: [recipient, 1_000_000n], // 1 USDC assuming 6 decimals
});

await sendUserOperation({
  evmSmartAccount: smartAccount,
  network: "base-sepolia",
  calls: [
    {
      to: usdcAddress,
      data,
      value: 0n,
    },
  ],
});

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Gas sponsorship with paymaster

Use a paymaster to sponsor gas so users can transact without holding ETH.
  • Add paymasterUrl to sendUserOperation
  • Or set useCdpPaymaster: true to use the CDP Paymaster
Learn more about our Paymaster or see the Paymaster Quickstart. 
await sendUserOperation({
  evmSmartAccount: smartAccount,
  network: "base-sepolia",
  calls: [{ to: recipient, value: 10n ** 15n }],
  paymasterUrl: "https://your-paymaster.example.com",
});
Spend permissions APIs for Embedded Wallets are coming soon.Questions? Contact us in the #embedded-wallets channel on Discord.

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Reference

ResourceDescription
useCurrentUserGet the current authenticated user
useEvmAddressPrimary EVM address (Smart Account if present, else EOA)
useSendUserOperationSend a user operation; hook returns status/data
sendUserOperationOptionsOptions for sending a user operation
sendUserOperationResultResult fields for sendUserOperation
ethereum.createOnLoginConfig: “eoa” or “smart”
User typeuser.evmAccounts[], user.evmSmartAccounts[]
Hooks READMEPackage overview and usage