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This quickstart helps you write a script that transfers USDC from Ethereum to Solana.

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Prerequisites

Before you begin, ensure that you’ve:
  • Installed Node.js v22+ and npm.
  • Created an Ethereum Sepolia wallet and Solana Devnet wallet. You will fund these wallets in this quickstart.

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Step 1. Set up the project

This step shows you how to prepare your project and environment.

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1.1. Set up your development environment

Create a new directory and install Bridge Kit and its dependencies:
Shell
# Set up your directory and initialize the project
mkdir bridge-kit-quickstart-transfer-eth-to-sol
cd bridge-kit-quickstart-transfer-eth-to-sol
npm init -y

# Install Bridge Kit and tools
npm install @circle-fin/bridge-kit @circle-fin/adapter-viem-v2 @circle-fin/adapter-solana @solana/web3.js @solana/spl-token viem typescript tsx dotenv

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1.2. Initialize and configure the project

First, initialize the project. This command creates a tsconfig.json file:
Shell
# Initialize a TypeScript project
npx tsc --init
Then, edit the tsconfig.json file:
Shell
# Replace the contents of the generated file
cat <<'EOF' > tsconfig.json
{
  "compilerOptions": {
    "target": "ESNext",
    "module": "ESNext",
    "moduleResolution": "bundler",
    "strict": true
  }
}
EOF

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1.3. Configure environment variables

Create an .env file in the project directory and add your wallet private key, replacing {YOUR_PRIVATE_KEY} with the private key for your Ethereum Sepolia wallet and {YOUR_SOLANA_PRIVATE_KEY} with the Base58-encoded private key for your Solana Devnet wallet.
Tip: You can find and export your private keys in MetaMask and Phantom.
Shell
echo "PRIVATE_KEY={YOUR_PRIVATE_KEY}
SOLANA_PRIVATE_KEY={YOUR_SOLANA_PRIVATE_KEY}" > .env
Warning: This is strictly for testing purposes. Never share your private key.

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1.4. Fund your wallets (optional)

For this quickstart, you need USDC and native tokens in your Ethereum testnet wallet and native tokens in your Solana testnet wallet. If you need USDC testnet tokens, use the Circle Faucet to get 1 USDC on the Ethereum Sepolia and Solana Devnet testnets. Use the following faucets to get testnet native tokens in your wallets.

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Step 2. Bridge USDC

This step shows you how to set up your script, execute the bridge transfer, and check the result.

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2.1. Create the script

Create an index.ts file in the project directory and add the following code. This code sets up your script and transfers 1 USDC from Ethereum Sepolia to Solana Devnet.
TypeScript
// Import Bridge Kit and dependencies
import "dotenv/config";
import { BridgeKit } from "@circle-fin/bridge-kit";
import { createAdapterFromPrivateKey as createViemAdapterFromPrivateKey } from "@circle-fin/adapter-viem-v2";
import { createAdapterFromPrivateKey as createSolanaAdapterFromPrivateKey } from "@circle-fin/adapter-solana";
import { inspect } from "util";

// Initialize the SDK
const kit = new BridgeKit();

const bridgeUSDC = async (): Promise<void> => {
  try {
    // Initialize the Viem adapter which lets you transfer tokens from your wallet on any EVM-compatible chain
    const viemAdapter = createViemAdapterFromPrivateKey({
      privateKey: process.env.PRIVATE_KEY as string,
    });

    // Initialize the Solana adapter which lets you transfer tokens on Solana
    const solanaAdapter = createSolanaAdapterFromPrivateKey({
      privateKey: process.env.SOLANA_PRIVATE_KEY as string,
    });

    console.log("---------------Starting Bridging---------------");

    // Transfer 1 USDC from Ethereum to Solana
    const result = await kit.bridge({
      from: { adapter: viemAdapter, chain: "Ethereum_Sepolia" },
      to: { adapter: solanaAdapter, chain: "Solana_Devnet" },
      amount: "1.00",
    });

    console.log("RESULT", inspect(result, false, null, true));
  } catch (err) {
    console.log("ERROR", inspect(err, false, null, true));
  }
};

void bridgeUSDC();
To transfer from Solana Devnet to Ethereum Sepolia, swap the from and to contexts in the bridge call.
Tip: Collect a fee on transfers and estimate gas and provider fees before a transfer, only proceeding if the cost is acceptable.

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2.2. Run the script

Save the index.ts file and run the script in your terminal:
Shell
npx tsx index.ts

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2.3. Verify the transfer

After the script finishes, find the returned steps array in the terminal output. Each transaction step includes an explorerUrl. Use that link to verify that the USDC amount matches the amount you transferred. The following code is an example of how an approve step might look in the terminal output. The values are used in this example only and are not a real transaction:
Shell
steps: [
  {
    name: "approve",
    state: "success",
    txHash: "0xdeadbeefcafebabe1234567890abcdef1234567890abcdef1234567890abcd",
    data: {
      txHash:
        "0xdeadbeefcafebabe1234567890abcdef1234567890abcdef1234567890abcd",
      status: "success",
      cumulativeGasUsed: 17138643n,
      gasUsed: 38617n,
      blockNumber: 8778959n,
      blockHash:
        "0xbeadfacefeed1234567890abcdef1234567890abcdef1234567890abcdef12",
      transactionIndex: 173,
      effectiveGasPrice: 1037232n,
    explorerUrl:
      "https://sepolia.etherscan.io/tx/0xdeadbeefcafebabe1234567890abcdef1234567890abcdef1234567890abcd",
  },
];