To get XDC testnet USDC
Use Circle's CCTP sample app
to transfer USDC cross-chain to your XDC wallet.
To get testnet XDC
Use the XDC faucet from the XDC Apothem
testnet network.
This guide shows you how to transfer USDC on the XDC Apothem testnet. You'll write a simple script that checks your balance and sends a test transfer.
Before you begin, make sure you have:
- Installed Node.js v18+.
- Prepared an XDC Apothem testnet wallet funded with:
- Testnet USDC for the transfer.
- Testnet XDC for gas fees.
- A private key and a recipient address stored in a
.envfile.
-
Initialize a new Node.js project and install dependencies:
Shellnpm init -y npm pkg set type=module npm install viem dotenv -
In the project root, create a
.envfile with your private key and recipient address:ShellPRIVATE_KEY=<YOUR_PRIVATE_KEY> RECIPIENT_ADDRESS=0x<RECIPIENT_ADDRESS> -
Create an
index.jsfile. You'll add code step by step in the following sections.
In index.js, import required modules and define constants for the XDC Apothem
testnet and the USDC contract:
JavaScript
import "dotenv/config";
import {
createPublicClient,
createWalletClient,
http,
formatUnits,
parseUnits,
} from "viem";
import { privateKeyToAccount } from "viem/accounts";
import { xdcTestnet } from "viem/chains";
const USDC_ADDRESS = "0xb5AB69F7bBada22B28e79C8FFAECe55eF1c771D4";
const USDC_DECIMALS = 6;
const USDC_ABI = [
{
name: "balanceOf",
type: "function",
stateMutability: "view",
inputs: [{ name: "account", type: "address" }],
outputs: [{ name: "", type: "uint256" }],
},
{
name: "transfer",
type: "function",
stateMutability: "nonpayable",
inputs: [
{ name: "to", type: "address" },
{ name: "amount", type: "uint256" },
],
outputs: [{ name: "", type: "bool" }],
},
];
Learn more: Chain and contract configuration
- Imports required modules from Viem and your
.envfile. - Loads the XDC Apothem testnet configuration.
- Defines the USDC contract address, decimals, and minimal ABI.
- Only includes the
balanceOfandtransferfunctions, since they're all that's needed for this guide.
Next, load your private key and recipient address from .env:
JavaScript
const PRIVATE_KEY_RAW = process.env.PRIVATE_KEY;
const RECIPIENT = process.env.RECIPIENT_ADDRESS;
if (!PRIVATE_KEY_RAW || !RECIPIENT) {
console.error("Error: Missing PRIVATE_KEY or RECIPIENT_ADDRESS in .env");
process.exit(1);
}
if (!/^0x[a-fA-F0-9]{40}$/.test(RECIPIENT)) {
console.error("Error: Recipient address is invalid");
process.exit(1);
}
const PRIVATE_KEY = PRIVATE_KEY_RAW.startsWith("0x")
? PRIVATE_KEY_RAW
: `0x${PRIVATE_KEY_RAW}`;
Learn more: Environment variables
- Loads values from the
.envfile so you don't hardcode sensitive information. - Checks that both the private key and recipient address are set.
- Validates the recipient address format with a regex.
- Ensures the private key is properly prefixed with
0xso Viem can use it.
Create a public client for reading blockchain data and a wallet client for sending transactions:
JavaScript
const account = privateKeyToAccount(PRIVATE_KEY);
const publicClient = createPublicClient({
chain: xdcTestnet,
transport: http(),
});
const walletClient = createWalletClient({
account,
chain: xdcTestnet,
transport: http(),
});
Learn more: Viem clients
privateKeyToAccountcreates an account object from your private key.createPublicClientis used for reading data from the blockchain (no private key needed).createWalletClientuses your account to sign and send transactions.- Together, these clients give you read and write access to XDC Apothem.
Now, write the main logic to check your balance and send a transfer:
JavaScript
(async () => {
try {
// Check balance
const balance = await publicClient.readContract({
address: USDC_ADDRESS,
abi: USDC_ABI,
functionName: "balanceOf",
args: [account.address],
});
const balanceFormatted = Number(formatUnits(balance, USDC_DECIMALS));
const amount = 10; // send 10 USDC
console.log("Sender:", account.address);
console.log("Recipient:", RECIPIENT);
console.log("Balance:", balanceFormatted);
if (amount > balanceFormatted) {
console.error("Error: Insufficient balance");
process.exit(1);
}
const amountInDecimals = parseUnits(amount.toString(), USDC_DECIMALS);
// Transfer
const hash = await walletClient.writeContract({
address: USDC_ADDRESS,
abi: USDC_ABI,
functionName: "transfer",
args: [RECIPIENT, amountInDecimals],
});
console.log("Transfer successful!");
console.log("Tx hash:", hash);
console.log("Explorer:", `https://testnet.xdcscan.com/tx/${hash}`);
} catch (err) {
console.error("Transfer failed:", err.message || err);
process.exit(1);
}
})();
Learn more: Transfer logic
- Reads your USDC balance using the
balanceOffunction. - Converts the balance into a human-readable format with
formatUnits. - Sets the transfer amount (10 USDC in this example).
- Validates that your balance is sufficient.
- Converts the transfer amount back into smallest units with
parseUnits. - Calls the
transferfunction on the USDC contract to send tokens. - Logs the transaction hash and a block explorer link so you can verify the transfer.
After running the script:
Shell
node index.js
You'll see output similar to the following:
Text
Sender: 0x1A2b...7890
Recipient: 0x9F8f...1234
Balance: 250.0
Transfer successful!
Tx hash: 0xabc123...def456
Explorer: https://testnet.xdcscan.com/tx/0xabc123...def456
To verify the transfer, copy the transaction hash URL from the Explorer: line
and open it in your browser. This will take you to the XDC Apothem testnet
explorer, where you can view full transaction details.
Tip: If your script doesn't output a full explorer URL, you can manually paste the transaction hash into the XDC testnet explorer.
In this quickstart, you learned how to check balances and transfer USDC on the XDC Apothem testnet using Viem and Node.js. Here are the key points to remember:
- Testnet only. XDC testnet USDC has no real value.
- Gas fees. You need a small amount of testnet XDC for gas.
- Security. Keep your private key in
.env. Never commit secrets. - Minimal ABI. The script only uses
balanceOfandtransferfor simplicity.
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