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This quickstart helps you write a server-side script that bridges USDC between Solana and an EVM-compatible blockchain. The examples in this quickstart use Solana Devnet and Arc Testnet, but you can use Solana and any supported EVM chain as source or destination.

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Prerequisites

Before you begin, ensure that you’ve:

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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 App Kit and its dependencies:
Shell
# Set up your directory and initialize the project
mkdir app-kit-quickstart-bridge-solana-evm
cd app-kit-quickstart-bridge-solana-evm
npm init -y

# Install App Kit and tools (Solana + EVM adapters)
npm install @circle-fin/app-kit @circle-fin/adapter-viem-v2 @circle-fin/adapter-solana-kit @solana/kit @solana/web3.js viem typescript tsx
Only need to bridge and want a lighter install than the full App Kit? Install the standalone bridge package instead: @circle-fin/bridge-kit

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1.2. Configure TypeScript (optional)

This step is optional. It helps prevent missing types in your IDE or editor.
Create a tsconfig.json file:
Shell
npx tsc --init
Then, update the tsconfig.json file:
Shell
cat <<'EOF' > tsconfig.json
{
  "compilerOptions": {
    "target": "ESNext",
    "module": "ESNext",
    "moduleResolution": "bundler",
    "strict": true,
    "types": ["node"]
  }
}
EOF

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1.3. Configure environment variables

Create an .env file in the project directory:
Shell
touch .env
Then, add your wallet private keys. Replace YOUR_SOLANA_PRIVATE_KEY with your Solana wallet private key and YOUR_ARC_TESTNET_PRIVATE_KEY with your Arc Testnet (EVM) wallet private key:
.env
SOLANA_PRIVATE_KEY=YOUR_SOLANA_PRIVATE_KEY
EVM_PRIVATE_KEY=YOUR_ARC_TESTNET_PRIVATE_KEY
If you use MetaMask, follow their guide for how to find and export your private key.
Edit .env files in your IDE or editor so credentials are not leaked to your shell history.

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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 bridges 1.00 USDC from Solana Devnet to Arc Testnet:
Using a different EVM chain or Solana as the destination? Change the chain values in kit.bridge() and ensure your source wallet has USDC and both wallets have native tokens.
TypeScript
// Import App Kit and dependencies
import { AppKit } from "@circle-fin/app-kit";
import { createViemAdapterFromPrivateKey } from "@circle-fin/adapter-viem-v2";
import { createSolanaKitAdapterFromPrivateKey } from "@circle-fin/adapter-solana-kit";
import { inspect } from "util";

const kit = new AppKit();

const bridgeUSDC = async (): Promise<void> => {
  try {
    const solanaAdapter = createSolanaKitAdapterFromPrivateKey({
      privateKey: process.env.SOLANA_PRIVATE_KEY as string,
    });
    const evmAdapter = createViemAdapterFromPrivateKey({
      privateKey: process.env.EVM_PRIVATE_KEY as string,
    });

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

    const result = await kit.bridge({
      from: { adapter: solanaAdapter, chain: "Solana_Devnet" },
      to: { adapter: evmAdapter, chain: "Arc_Testnet" },
      amount: "1.00",
    });

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

void bridgeUSDC();
You can customize your bridges to collect a fee, use the CCTP Forwarding Service, or estimate gas and provider fees before bridging. Proceed only if the cost works for you.

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2.2. Run the script

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

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2.3. Verify the transaction

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 bridged. 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://testnet.arcscan.app/tx/0xdeadbeefcafebabe1234567890abcdef1234567890abcdef1234567890abcd",
    },
  },
];