# How to Add the Arbitrum One Network to MetaMask

**A Step-by-Step Guide**

With the growing popularity of layer-2 scaling solutions, Arbitrum One has gained considerable attention in the Ethereum community. If you're looking to interact with dApps on Arbitrum or manage assets on this layer-2 rollup, you'll need to configure your MetaMask wallet accordingly. Here's a comprehensive guide on adding the Arbitrum One Network to your MetaMask.

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**1. Open MetaMask:**

* First and foremost, ensure you've already installed MetaMask on your device. If not, refer to our previous guide on how to install MetaMask.
* Once installed, click on the MetaMask icon (depicting a fox) in your browser or open the mobile application.

**2. Access Network Settings:**

* At the top center of the MetaMask interface, you'll find the current network you're connected to, often set to "Ethereum Mainnet" by default.
* Click on this network dropdown.

**3. Add a Custom RPC Network:**

* At the bottom of the dropdown, you'll see an option labeled "Custom RPC". Click on it.
* This will open up a form where you can input the details of a new network.

**4. Enter Arbitrum One Network Details:**

Fill in the fields with the following Arbitrum One details:

* **Network Name:** Arbitrum One
* **New RPC URL:** `https://arb1.arbitrum.io/rpc`
* **Chain ID:** `42161`
* **Currency Symbol (optional):** ETH
* **Block Explorer URL (optional):** `https://explorer.arbitrum.io/`

After entering these details, ensure you double-check for accuracy. An incorrect Chain ID or RPC URL can lead to issues when attempting to interact with the network.

**5. Save and Select the Network:**

* Once you've filled in all the details, click on the "Save" button.
* You should now be automatically connected to the Arbitrum One Network. If not, you can always switch to it using the network dropdown at the top center of the MetaMask interface.

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**Things to Remember:**

1. **Transaction Costs:** While Arbitrum aims to reduce transaction costs significantly, remember that it's not entirely free. You'll still need some ETH in your MetaMask to pay for transactions on the Arbitrum One Network.
2. **Network Differences:** Arbitrum is a separate network from the Ethereum Mainnet. Always ensure you're on the correct network before making transactions or interacting with dApps to avoid unnecessary complications.
3. **Security:** Always make sure you're using official and trusted sources when adding new networks or interacting with unfamiliar platforms. Avoid phishing sites and always double-check URLs.

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With the Arbitrum One Network now added to your MetaMask, you're all set to explore the layer-2 dApps, yield farms, and other services that are sprouting in this burgeoning ecosystem. As with any blockchain interaction, always prioritize safety, do your research, and stay informed.


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