> For the complete documentation index, see [llms.txt](https://stylus-1.gitbook.io/stylusguide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://stylus-1.gitbook.io/stylusguide/3.-your-first-smart-contract-hello-world/deploying-and-testing-your-contract.md).

# Deploying and Testing Your Contract

####

### Step 4: Deploying the Contract

#### Check the Contract

Ensure the contract meets all requirements:

```sh
cargo stylus check --endpoint https://sepolia-rollup.arbitrum.io/rpc
```

#### Deploy the Contract

Ensure you have a valid private key saved in a file (e.g., `private_key.txt`). The file should contain only the private key without any extra characters or spaces.

Deploy the contract using the following command:

```sh
cargo stylus deploy --private-key-path=/path/to/private_key.txt --endpoint https://sepolia-rollup.arbitrum.io/rpc
```

### Step 5: Interacting with the Contract

#### Setup MetaMask

Configure MetaMask for the Arbitrum network following these [instructions](https://support.arbitrum.io/hc/en-us/articles/4408040006931-How-To-Connect-MetaMask-To-Arbitrum).

#### Acquire Testnet ETH

Use faucets like [BwareLabs](https://bwarelabs.com/faucets/arbitrum-sepolia) or [QuickNode](https://faucet.quicknode.com/arbitrum/sepolia) to get Sepolia ETH for testing.

#### Interacting with the Contract using Ethers.js

```javascript
const { ethers } = require("ethers");

const provider = new ethers.providers.JsonRpcProvider("https://sepolia-rollup.arbitrum.io/rpc");
const contractAddress = "<YOUR_CONTRACT_ADDRESS>";

const abi = [
    "function get_greeting() view returns (string)"
];

const privateKey = "<YOUR_PRIVATE_KEY>";
const wallet = new ethers.Wallet(privateKey, provider);
const contract = new ethers.Contract(contractAddress, abi, wallet);

async function main() {
    const greeting = await contract.get_greeting();
    console.log("Greeting from contract:", greeting);
}

main().catch(console.error);
```

By following these steps, you can set up your development environment, create and deploy a simple hello contract, and interact with it using Ethers.js.


---

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