> ## Documentation Index
> Fetch the complete documentation index at: https://developers.circle.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Quickstart: Set up a USDC trustline on XRPL

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

## Prerequisites

Before you begin, ensure you have the following:

* [Node.js 16 or later](https://nodejs.org/)
* A terminal or code editor

## Part 1: Set up your project

Perform the following steps to set up your project.

### 1.1. Create a project directory

Run the following commands to create and initialize your project:

```shell Shell theme={null}
mkdir xrpl-usdc-trustline
cd xrpl-usdc-trustline
npm init -y
```

### 1.2. Install dependencies

Run the following command to install the required libraries:

```shell Shell theme={null}
npm i xrpl typescript ts-node
```

## Part 2: Configure your project

Perform the following steps to configure your project.

### 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:

```json package.json theme={null}
{
  "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"
  }
}
```

### 2.2. Add a `tsconfig.json` file

Create a `tsconfig.json` file with the following configuration:

```json tsconfig.json theme={null}
{
  "compilerOptions": {
    "target": "ES2020",
    "module": "CommonJS",
    "lib": ["ES2020"],
    "strict": true,
    "esModuleInterop": true,
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true,
    "outDir": "./dist",
    "rootDir": "./"
  },
  "include": ["*.ts"],
  "exclude": ["node_modules"]
}
```

## Part 3: Write your app code

Create a `main.ts` file and paste the following code:

```ts theme={null}
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);
```

## Part 4: Run your application

Run the following from your project folder:

```shell Shell theme={null}
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.