How to Add Arbitrum to MetaMask

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Arbitrum is a leading Layer 2 scaling solution for Ethereum, designed to enhance transaction speed and reduce gas fees while maintaining the security of the Ethereum Mainnet. Integrating Arbitrum with your MetaMask wallet allows you to interact with decentralized applications (dApps) on this efficient network. This guide provides clear, step-by-step instructions for adding both Arbitrum Mainnet and its testnet to MetaMask.

Understanding Arbitrum Networks

Before you begin, it's important to understand the different networks available on Arbitrum.

Mainnet vs. Testnet

The Arbitrum ecosystem consists of a production-ready Mainnet and testnets for development and experimentation. The Mainnet is used for real transactions with real value, while testnets allow developers to test applications without spending real funds.

Choosing a Testnet

While Arbitrum has supported the Goerli testnet, the Ethereum Foundation has announced its deprecation. It is highly recommended to use the Sepolia testnet for all testing purposes. Alchemy provides full support for Sepolia, including a free faucet for obtaining testnet ETH.

The standard RPC endpoints for these networks are:

Using a dedicated RPC provider like Alchemy ensures reliable and high-performance connection to the blockchain.

Method 1: Using the 'Add to Wallet' Button (Recommended)

The simplest way to add Arbitrum to your MetaMask is by using the integrated 'Add to Wallet' feature provided by many development platforms.

Step 1: Create a Developer Account

The first step is to create a free account on a platform that provides blockchain infrastructure services. This account will generate your unique API key, which acts as your secure gateway to the Arbitrum network. During sign-up, ensure you select the Ethereum + L2 Ecosystem to get access to Layer 2 solutions like Arbitrum.

Step 2: Create an Arbitrum Application

Once your account is set up, you need to create a new "app" or project within your dashboard. During this setup, you will be prompted to select a chain. Choose Arbitrum and then specify whether you want to connect to the Mainnet or the Sepolia testnet.

Step 3: Add the Network to MetaMask

After creating your app, the dashboard will provide an 'Add to Wallet' button. Clicking this button will automatically prompt your MetaMask wallet with all the correct network parameters pre-filled. You simply need to approve the addition. This method eliminates the risk of manual entry errors and is the fastest way to get started.

👉 Get a reliable RPC endpoint for your wallet

Method 2: Manual RPC Configuration

If you prefer to configure the network settings yourself or are using a service that doesn't offer the one-click button, you can add Arbitrum manually.

Step 1: Obtain Your API Key

After creating your application on your infrastructure provider's dashboard, locate the section for your API keys. Copy the HTTP endpoint URL. This URL is your custom RPC URL that you will input into MetaMask.

Step 2: Add Arbitrum Mainnet to MetaMask

Follow these steps carefully to add the main network:

  1. Open your MetaMask extension and click on the network dropdown at the top of the window.
  2. Click "Add network" at the bottom of the list.
  3. You will be taken to a new screen; click "Add a network manually".

  4. Enter the following details precisely:

    • Network Name: Arbitrum One
    • New RPC URL: Paste the HTTP URL you copied from your dashboard (e.g., https://arb-mainnet.g.alchemy.com/v2/your-api-key)
    • Chain ID: 42161
    • Currency Symbol: ETH
    • Block Explorer URL (Optional): https://arbiscan.io
  5. Click Save. MetaMask will now switch to the newly added Arbitrum One network.

Step 3: Add Arbitrum Sepolia Testnet

To add the testnet, you must first enable testnet visibility in MetaMask:

Now, follow the same "Add network manually" process, but use these testnet parameters:

Frequently Asked Questions

What is the difference between Arbitrum and Ethereum?

Arbitrum is a Layer 2 scaling solution built on top of Ethereum. It processes transactions off-chain and posts the data back to Ethereum, resulting in significantly faster speeds and lower transaction fees (gas) while leveraging Ethereum's security.

Why do I need a custom RPC URL instead of a public one?

Using a custom RPC URL from a service provider offers greater reliability, faster response times, and higher rate limits compared to public endpoints. This provides a smoother and more consistent experience when interacting with dApps. 👉 Explore high-performance network settings

Is it safe to add a custom network like Arbitrum to MetaMask?

Yes, it is safe as long as you are using the correct and verified network parameters (Chain ID, RPC URL) from official sources. Always double-check the details before saving a new network to avoid phishing attempts.

What is the currency symbol on Arbitrum?

The native currency for transactions on the Arbitrum Mainnet is ETH (the same Ether used on Ethereum). On testnets, the symbol is also ETH, but it is valueless testnet ETH obtained from faucets.

I added the network but my funds aren't showing. What should I do?

This is a common issue. First, ensure you are on the correct network (e.g., Arbitrum One). If your funds are still not visible, you may need to import the token contract address manually into MetaMask to make it visible.

Can I use the same wallet address on Ethereum and Arbitrum?

Yes, your Ethereum wallet address is universal and works across multiple networks, including all Layer 2s like Arbitrum. The same seed phrase controls your address on every network.