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Overview

The CDP SDK is compatible with viem in a couple ways:
  1. viem Local Accounts can be set as the owner of a CDP Smart Account. See the Signer Example below.
  2. CDP accounts can be wrapped into viem Custom Accounts using the toAccount function. See the Wallet Client Example below.

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Signer Example

You can create a viem Local Account and set it as the owner of a CDP Smart Account.
main.ts
import { CdpClient } from "@coinbase/cdp-sdk";
import { generatePrivateKey, privateKeyToAccount } from "viem/accounts";
import dotenv from "dotenv";

dotenv.config();

const cdp = new CdpClient();

const privateKey = generatePrivateKey();
const owner = privateKeyToAccount(privateKey);

const smartAccount = await cdp.evm.createSmartAccount({ owner });

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Wallet Client Example

You can pass a CDP account to the toAccount function and get back a viem Custom Account, which can be used wherever viem expects an account. For example, you can create a viem Wallet Client from this account and use the Wallet Client to send transactions. The following code snippet demonstrates how to use a viem Wallet Client to send a transaction. If you followed the quickstart, you will have a project that you can use to follow along with the example below.

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1. Install viem

Install viem in your project: 
npm install viem

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2. Create a Wallet Client from a CDP account

Here we use toAccount from viem/accounts to wrap a CDP account in a viem Custom Account, which is immediately passed to the createWalletClient function to create a viem Wallet Client.
main.ts
import { CdpClient } from "@coinbase/cdp-sdk";

import { createWalletClient } from "viem";
import { toAccount } from "viem/accounts";
import { baseSepolia } from "viem/chains";
import dotenv from "dotenv";

dotenv.config();

const cdp = new CdpClient();

const account = await cdp.evm.createAccount();
console.log("Created account:", account.address);

const walletClient = createWalletClient({
  account: toAccount(account),
  chain: baseSepolia,
  transport: http(),
});
  1. Send a transaction with the Wallet Client
Next, use the Wallet Client to send a transaction, after requesting some testnet ETH from the faucet.
main.ts
import { http, createPublicClient, parseEther } from "viem";
import dotenv from "dotenv";

dotenv.config();

const cdp = new CdpClient();

// ... existing code ...

// This is used to wait for transaction confirmation
const publicClient = createPublicClient({
  chain: baseSepolia,
  transport: http(),
});

console.log("Requesting testnet ETH from faucet...");
const { transactionHash: faucetTransactionHash } = await cdp.evm.requestFaucet({
  address: account.address,
  network: "base-sepolia",
  token: "eth",
});

console.log("Waiting for funds to arrive...");
const faucetTxReceipt = await publicClient.waitForTransactionReceipt({
  hash: faucetTransactionHash,
});
console.log("Received testnet ETH");

const hash = await walletClient.sendTransaction({
  to: "0x0000000000000000000000000000000000000000",
  value: parseEther("0.000001"),
});

const txReceipt = await publicClient.waitForTransactionReceipt({
  hash,
});
console.log(
  `Transaction sent! Link: https://sepolia.basescan.org/tx/${hash}`
);
  1. Putting it all together
Here’s the complete code for the example above.
main.ts
import { CdpClient } from "@coinbase/cdp-sdk";
import dotenv from "dotenv";
import { createWalletClient, http, createPublicClient, parseEther } from "viem";
import { toAccount } from "viem/accounts";
import { baseSepolia } from "viem/chains";

dotenv.config();
const cdp = new CdpClient();

const account = await cdp.evm.createAccount();
console.log("Created account:", account.address);

const walletClient = createWalletClient({
  account: toAccount(account),
  chain: baseSepolia,
  transport: http(),
});

// This is used to wait for transaction confirmation
const publicClient = createPublicClient({
  chain: baseSepolia,
  transport: http(),
});

console.log("Requesting testnet ETH from faucet...");
const { transactionHash: faucetTransactionHash } = await cdp.evm.requestFaucet({
  address: account.address,
  network: "base-sepolia",
  token: "eth",
});

console.log("Waiting for funds to arrive...");
const faucetTxReceipt = await publicClient.waitForTransactionReceipt({
  hash: faucetTransactionHash,
});
console.log("Received testnet ETH");

const hash = await walletClient.sendTransaction({
  to: "0x0000000000000000000000000000000000000000",
  value: parseEther("0.000001"),
});

const txReceipt = await publicClient.waitForTransactionReceipt({
  hash,
});
console.log(
  `Transaction sent! Link: https://sepolia.basescan.org/tx/${hash}`
);
  • v2 Wallet Accounts: Read more about the types of accounts and networks we support.
  • viem: Learn from the official docs on how to get started developing with viem.