How do I connect MetaMask to the Optimism network?

Connect your MetaMask wallet to the Optimism network by adding the custom RPC settings, then bridge funds via the official Optimism Gateway for lower gas fees and faster transactions.

Jun 12, 2025 at 11:29 am

Understanding the Basics of MetaMask and Optimism Network

Before diving into the technical steps, it's essential to understand what MetaMask and the Optimism network are. MetaMask is a popular cryptocurrency wallet that allows users to manage their Ethereum-based assets and interact with decentralized applications (dApps). The Optimism network, on the other hand, is an Ethereum Layer 2 scaling solution designed to reduce transaction fees and increase throughput while maintaining security.

Connecting your MetaMask wallet to the Optimism network enables you to access dApps built on this layer-2 platform, such as Uniswap or Synthetix, with significantly lower gas costs compared to the Ethereum mainnet.

Accessing MetaMask Settings for Network Configuration

To begin connecting MetaMask to Optimism, you must first open the MetaMask extension or mobile app. If you're using the browser extension, click on the fox icon in your browser toolbar to open the wallet interface. Once inside, locate the network selection dropdown at the top of the screen.

By default, MetaMask shows networks like Ethereum Mainnet, Ropsten, Rinkeby, Goerli, and Kovan. Since Optimism isn't listed by default, you'll need to manually add it. Click on "Custom RPC" from the network dropdown menu. This will open a form where you can input the required details for the Optimism network.

Filling in the Optimism Network Details Correctly

When adding a custom network in MetaMask, accuracy is crucial. Here are the exact parameters you should use to connect to the Optimism network:

• Network Name: Optimism
• New RPC URL: https://mainnet.optimism.io
• Chain ID: 10
• Currency Symbol: ETH
• Block Explorer URL: https://optimistic.etherscan.io

Make sure you copy these values exactly as provided. Entering incorrect data may result in failed transactions or even loss of funds if you accidentally send assets to the wrong network.

Verifying the Connection and Switching Networks

Once you've filled out the form correctly, click the "Save" button. You should now see Optimism appear in your network list within MetaMask. Click on the network name to switch from your current network (e.g., Ethereum Mainnet) to the newly added Optimism network.

After switching, your wallet balance will update based on the assets you hold on the Optimism chain. Note that balances on Layer 1 (Ethereum) and Layer 2 (Optimism) are separate. If you have no funds on Optimism, your balance will show zero until you bridge some assets over.

Bridging Funds to the Optimism Network

Now that you're connected to the Optimism network, you might want to transfer funds from Ethereum Mainnet to Optimism. To do this, visit the official Optimism Gateway at https://app.optimism.io/bridge/.

Ensure you're connected to the Ethereum Mainnet in MetaMask before initiating the transfer. Select the amount of ETH or ERC-20 tokens you wish to bridge. Confirm the transaction in MetaMask, and wait for the funds to be processed. Depending on network congestion, this process may take anywhere from 5 to 20 minutes.

Once completed, switch back to the Optimism network in MetaMask and verify that your funds have arrived.

Common Issues and Troubleshooting Tips

Sometimes, users encounter issues when trying to connect MetaMask to Optimism. One common problem is sending funds directly to the Optimism network without using the bridge. This action can lead to permanent loss of funds since direct transfers between chains aren't supported.

Another issue is entering the wrong Chain ID or RPC URL during setup. Always double-check the information provided earlier. If you mistakenly added the network with incorrect settings, remove it from MetaMask under Settings > Networks > Custom Networks, then re-add it using the correct details.

If you're still having trouble, try clearing the cache in your browser or restarting the MetaMask app. Also, ensure that your MetaMask version is up-to-date to avoid compatibility issues.

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Frequently Asked Questions

Q: Can I use the same address on both Ethereum and Optimism?

Yes, your MetaMask address remains the same across both Ethereum and Optimism. However, the balances are stored separately on each chain.

Q: Is there a fee for bridging assets to Optimism?

Yes, you’ll pay a small gas fee on Ethereum when initiating the bridge. This cost varies depending on network congestion but is generally much cheaper than regular Ethereum transactions.

Q: How long does it take to bridge funds to Optimism?

The time required to complete a deposit from Ethereum to Optimism typically ranges between 5 to 20 minutes. Withdrawals back to Ethereum can take up to 7 days due to the security mechanisms in place.

Q: Are all ERC-20 tokens compatible with Optimism?

Most major ERC-20 tokens are supported on Optimism, but not all. You should check whether the token you're transferring is available on the Optimism network before attempting to bridge it.