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In this guide, you will create a smart account and make a cross-chain swap in 5 minutes.

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Prerequisites

You don’t need an API key to get started. For production use, you’ll need one. For production setups that sponsor user fees or use dashboard API keys, see the Security guide to proxy Orchestrator requests via a backend and avoid exposing your key.
You will need some testnet funds. To get testnet ETH, you can use a faucet from Quicknode or Alchemy. To get testnet USDC, use Circle Faucet. Install the Rhinestone SDK: 
npm install viem @rhinestone/sdk

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Creating a Wallet

Let’s create a smart account with a single owner: 
import { RhinestoneSDK } from '@rhinestone/sdk'
import { generatePrivateKey, privateKeyToAccount } from 'viem/accounts'
import { baseSepolia, arbitrumSepolia } from 'viem/chains'
import {
  createPublicClient,
  createWalletClient,
  encodeFunctionData,
  erc20Abi,
  type Hex,
  http,
  parseEther,
} from 'viem'

const fundingPrivateKey = process.env.FUNDING_PRIVATE_KEY
if (!fundingPrivateKey) {
  throw new Error('FUNDING_PRIVATE_KEY is not set')
}

const sourceChain = baseSepolia
const targetChain = arbitrumSepolia

// You can use an existing PK here
const privateKey = generatePrivateKey()
console.log(`Owner private key: ${privateKey}`)
const account = privateKeyToAccount(privateKey)

const rhinestone = new RhinestoneSDK()
const rhinestoneAccount = await rhinestone.createAccount({
  owners: {
    type: 'ecdsa',
    accounts: [account],
  },
})
const address = rhinestoneAccount.getAddress()
console.log(`Smart account address: ${address}`)

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Funding the Account

We will send some ETH from the funding account to the created smart account. The Orchestrator will use some of that ETH to deploy the account on the target chain, as well as to convert it to USDC for a transfer transaction. 
const publicClient = createPublicClient({
  chain: sourceChain,
  transport: http(),
})
const fundingAccount = privateKeyToAccount(fundingPrivateKey as Hex)
const fundingClient = createWalletClient({
  account: fundingAccount,
  chain: sourceChain,
  transport: http(),
})

const txHash = await fundingClient.sendTransaction({
  to: address,
  value: parseEther('0.001'),
})
await publicClient.waitForTransactionReceipt({ hash: txHash })

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Sending a Cross-chain Transaction

Finally, let’s make a cross-chain token transfer: 
const usdcAmount = 1n

const transaction = await rhinestoneAccount.sendTransaction({
  sourceChains: [sourceChain],
  targetChain,
  calls: [
    {
      to: 'USDC',
      value: 0n,
      data: encodeFunctionData({
        abi: erc20Abi,
        functionName: 'transfer',
        args: ['0xd8da6bf26964af9d7eed9e03e53415d37aa96045', usdcAmount],
      }),
    },
  ],
  tokenRequests: [
    {
      address: 'USDC',
      amount: usdcAmount,
    },
  ],
})
console.log('Transaction', transaction)

const transactionResult = await rhinestoneAccount.waitForExecution(transaction)
console.log('Result', transactionResult)
After running that, you will get a smart account deployed on both Base Sepolia and Arbitrum Sepolia, and make a cross-chain USDC transfer. Note that you don’t need to manage the gas tokens or do the ETH → USDC swap when making a transfer. The Orchestrator will handle that for you!

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Next Steps

Learn more about customizing the account signers.

Passkeys

Using biometrics to authorize transactions.

Smart Sessions

Managing onchain permissions.

Embedded Wallets

Using wallets like Privy and Dynamic.