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This guide shows you how to set up a trustline for USDC on the XRPL Testnet using TypeScript. You’ll use the XRPL JavaScript SDK to:
  • Create and fund a wallet
  • Establish a trustline with the USDC issuer
  • Prepare the wallet to receive USDC

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Prerequisites

Before you begin, ensure you have the following:

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Part 1: Set up your project

Perform the following steps to set up your project.

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1.1. Create a project directory

Run the following commands to create and initialize your project:
Shell
mkdir xrpl-usdc-trustline
cd xrpl-usdc-trustline
npm init -y

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1.2. Install dependencies

Run the following command to install the required libraries:
Shell
npm i xrpl typescript ts-node

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Part 2: Configure your project

Perform the following steps to configure your project.

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2.1. Update the package.json file

Open your package.json file and make the following updates:
  • Remove the "type": "commonjs" line if it was automatically added.
  • Add or update the start script to use ts-node to run your main.ts file.
Your updated package.json should look similar to the following:
package.json
{
  "name": "xrpl-usdc-trustline",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "ts-node main.ts"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "ts-node": "^10.9.2",
    "typescript": "^5.8.3",
    "xrpl": "^4.2.5"
  }
}

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2.2. Add a tsconfig.json file

Create a tsconfig.json file with the following configuration:
tsconfig.json
{
  "compilerOptions": {
    "target": "ES2020",
    "module": "CommonJS",
    "lib": ["ES2020"],
    "strict": true,
    "esModuleInterop": true,
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true,
    "outDir": "./dist",
    "rootDir": "./"
  },
  "include": ["*.ts"],
  "exclude": ["node_modules"]
}

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Part 3: Write your app code

Create a main.ts file and paste the following code:
Typescript
import {
  Client,
  IssuedCurrencyAmount,
  TransactionMetadata,
  TrustSetFlags,
  Wallet,
} from "xrpl";

const USDC: IssuedCurrencyAmount = {
  currency: "5553444300000000000000000000000000000000",
  issuer: "rHuGNhqTG32mfmAvWA8hUyWRLV3tCSwKQt",
  value: "1000000000",
};

async function main() {
  const client = new Client("wss://s.altnet.rippletest.net:51233");
  await client.connect();

  try {
    // Creating and funding a user wallet
    console.log("Creating and funding a user wallet...");
    const userWallet = Wallet.generate();
    await client.fundWallet(userWallet);

    console.log("======= User wallet details =======");
    console.log("Address:", userWallet.address);
    console.log("Seed:", userWallet.seed);
    console.log("NOTE: DO NOT SHARE THE SEED WITH ANYONE!");
    console.log("===================================");
    console.log("");

    // Creating a trustline for USDC
    console.log("Creating a trustline for USDC...");
    const response = await client.submitAndWait(
      {
        TransactionType: "TrustSet",
        Account: userWallet.address,
        LimitAmount: USDC,
        Flags: TrustSetFlags.tfSetNoRipple,
      },
      { autofill: true, wallet: userWallet },
    );

    if (
      response.result.validated &&
      (response.result.meta as TransactionMetadata).TransactionResult !==
        "tesSUCCESS"
    ) {
      throw new Error(`Transaction failed: ${JSON.stringify(response)}`);
    }

    console.log(
      `Transaction succeeded: https://testnet.xrpl.org/transactions/${response.result.hash}`,
    );

    // Receiving USDC
    console.log("Receiving USDC...");
  } finally {
    await client.disconnect();
  }
}

main().catch(console.error);

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Part 4: Run your application

Run the following from your project folder:
Shell
npm start
After you run the script, the terminal should display your wallet’s public address, the wallet seed, and a transaction link that confirms the successful creation of the trustline. Your wallet is now ready to receive USDC on the XRPL Testnet.
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