MetaMask does not come with Optimism included by default. As Optimism is an independent blockchain running on top of Ethereum, you should inform your wallet about its presence first so that you can receive and store OP tokens, work with Optimism-based applications, or benefit from the drastically reduced transaction fees this network offers. Adding it is a quick process that takes a few minutes, and you can either do it using a one-click tool via Optimism's official website or manually by inputting network parameters yourself. This guide describes both approaches and explains the meaning of each field, as well as how to move your funds to Optimism once it is added.
What Optimism Is and Why It Requires a Separate Network Addition
Optimism is a layer 2 scaling solution for Ethereum. It processes all transactions outside the main Ethereum chain and then pushes compressed data into it, keeping costs minimal while leveraging Ethereum as a security source. Optimism uses the architecture called optimistic rollup: all transactions are considered valid initially and may be challenged during a certain period of time.
Because Optimism operates as its own blockchain and produces blocks independently, MetaMask considers it a completely independent network, not related to Ethereum mainnet. Each network in MetaMask has its own RPC endpoint, chain ID, and currency symbol, so the wallet needs this information to operate properly. Failing to add this network to your MetaMask means that it will be oblivious to the existence of the Optimism blockchain, although the accounts between them are the same.
Before You Start: Requirements The only thing that you need is the MetaMask extension or mobile app installed in your browser and linked to a wallet. If you already use MetaMask for Ethereum mainnet, your wallet address will stay the same when adding the Optimism network to it -- it will not create a new one or make you enter a new seed phrase.
Also, you need some ETH on the Optimism network to pay for gas once you start working with it. If your wallet is empty on Optimism, you need to transfer the funds there from Ethereum mainnet or purchase ETH via an exchange supporting Optimism withdrawals, as described further in this article.
Method 1: Adding Optimism With One Click
The easiest way to add the network is via Chainlist, the community-built repository of EVM-compatible networks, or via the official Optimism website. Both offer a button triggering automatic addition of the network in MetaMask without manually entering any network information.
Via Chainlist
Open Chainlist in your web browser with MetaMask installed and unlocked. Type "Optimism" in the search bar and click the "Add to MetaMask" button next to the Optimism network entry. A "Connect Wallet" prompt may appear, so click it and follow the instructions in the MetaMask pop-up window that opens. Review the information shown there about the network name, RPC URL, chain ID, and currency symbol, then click "Approve" followed by "Switch network." Your wallet will be connected to Optimism right after that.
Via Optimism Website
The official Optimism website also provides a "Connect to Optimism" or similar button in its documentation and bridge interfaces. Clicking it launches the same procedure as with Chainlist.
Method 2: Adding Optimism Manually
If you prefer not to use a one-click tool, or if you would like to understand exactly how the addition is carried out, you can add Optimism manually. This is also a back-up method in case the automatic integration is temporarily unavailable.
Step 1. Open Network Settings
Open MetaMask and click the network selector button, usually located near the MetaMask logo, with its text reading "Ethereum Mainnet" by default. At the bottom of the drop-down list, click the "Add network" button and then choose "Add a network manually."
Step 2. Input the Network Parameters
Fill in all required fields as follows:
Network Name: Optimism
New RPC URL: https://mainnet.optimism.io
Chain ID: 10
Currency symbol: ETH
Block Explorer URL: https://optimistic.etherscan.io
It is especially important to fill in the "Chain ID" field correctly. Each EVM-compatible blockchain network has its own unique numeric identifier, and Optimism's is 10. This is necessary to prevent transactions intended for one network from being mixed up with another, since the wallet uses it to verify that it is communicating with the right chain.
Step 3. Save and Switch to Optimism
Once all fields are filled in, click the "Save" button. Optimism will be added to your MetaMask network list. Click the network selector button once more and choose "Optimism" to switch to it. Your wallet address stays the same, but the balance shown will now reflect what you hold on Optimism rather than Ethereum mainnet.
How to Verify That Optimism Is Added to Your MetaMask Correctly
Once the network is added, check that the chain ID shown in MetaMask matches 10. A mismatched chain ID is one of the most common signs of a phishing attempt, since scam sites may prompt you to add a network named "Optimism" with a different RPC endpoint designed to intercept your transactions or show a false balance.
Another way to verify is to check the transactions and balance of your MetaMask address on Optimistic Etherscan, the block explorer for Optimism. If the transactions and balance shown there match what MetaMask displays, the connection is working fine.
How to Get Funds on Optimism
Once the network is added to MetaMask, it does not contain any funds to work with. There are two main ways to get ETH or other tokens onto Optimism: bridging them from Ethereum mainnet or depositing from a centralized exchange that supports Optimism withdrawals.
From Ethereum Mainnet
The official Optimism Bridge is a convenient tool that allows you to transfer ETH or supported ERC-20 tokens from Ethereum mainnet to Optimism. You connect MetaMask, choose the asset and amount, and confirm the transaction on mainnet. It usually takes a few minutes, since depositing into a rollup is faster than withdrawing from one. Some third-party bridges also support transferring funds to Optimism, with different fee models, but the official bridge is the most trusted option since it is directly connected to the protocol.
From Centralized Exchange
Many centralized exchanges allow direct deposits to Optimism for ETH and select tokens. This way, you skip the bridging step entirely: you choose Optimism as the deposit network on the exchange, paste your MetaMask address there, and the funds arrive on Optimism right away. This method is usually faster and cheaper than the previous one, since it does not require a deposit transaction on Ethereum mainnet.
How to Withdraw Back to Ethereum Mainnet
Moving funds from Optimism back to Ethereum mainnet works differently from depositing. Because Optimism is an optimistic rollup, all withdrawals go through a challenge period of about seven days. This is an essential feature of Optimism's security mechanism, not a technical limitation, since it gives time to dispute any invalid state transition before funds are released.
Some third-party bridges offer faster withdrawals by providing liquidity to cover the withdrawal themselves, effectively skipping the challenge period for the user. Such bridges carry their own counterparty risk, though, since you are relying on them instead of the protocol's built-in security mechanism.
Common Issues When Adding Optimism to MetaMask
If MetaMask shows a zero balance after switching to Optimism, this usually means you have not yet deposited or bridged funds to the network, rather than an error in the setup itself. Check your address on Optimistic Etherscan to confirm whether any transactions exist on the network.
If the RPC endpoint fails to connect, it may be temporarily down or rate-limited. Public RPC endpoints are prone to downtime during periods of high network activity. Switching to an alternative public RPC or a node provider service can resolve persistent connection issues.
If a token does not show up automatically after a transaction, MetaMask may not recognize it and require manual addition. To do this, switch to the Optimism network, go to the Assets tab, click "Import tokens," and paste the token's contract address on Optimism -- this is different from the same token's address on Ethereum mainnet, since each network has its own separate deployment of the token.
Optimism's Gas Token and Fee Model
Gas fees on Optimism are paid in ETH, just like on Ethereum mainnet, but they are substantially lower because transactions are batched and only summarized data is posted to mainnet. Fees can still depend on Ethereum mainnet gas prices, since part of Optimism's fee structure is tied to the cost of posting data back to the base layer.
Some Optimism-based applications also accept the OP token for governance participation rather than as a gas token. OP holders can vote on proposals submitted to the Optimism Collective, which manages the distribution of public goods and protocol upgrades. Holding OP does not affect how gas fees are paid in any way.
Final Notes
Adding the Optimism network to MetaMask is a one-time process that takes only a few minutes. Entering the correct chain ID and RPC endpoint are the key details to get right, since incorrect values are the main cause of connection problems or, in rarer cases, exposure to phishing attempts. Once Optimism is added and funded, working with it is the same as with any other EVM-compatible network, just with lower fees and faster confirmations compared to Ethereum mainnet.
FAQ
Q: What is the chain ID for Optimism? A: Optimism's chain ID is 10. It is used by MetaMask and other wallets to confirm that a transaction or connection is targeting the correct network.
Q: Do I need a new wallet address to use Optimism? A: No. Since Optimism is EVM-compatible, you can use the same MetaMask address as on Ethereum mainnet without any changes. Adding the network only changes which chain your wallet connects to, not your address or private key.
Q: Why does my balance show zero after switching to Optimism? A: A zero balance after switching networks usually means you have not yet deposited or bridged funds to Optimism. Each network in MetaMask tracks its own balance, so funds from other networks do not appear automatically.
Q: How long does it take to bridge funds to Optimism? A: Funds bridged from Ethereum mainnet to Optimism are processed quickly, usually within a few minutes.
Q: Why does withdrawing from Optimism take so long? A: All withdrawals to Ethereum mainnet go through a challenge period of about seven days. This is an inherent characteristic of Optimism's security architecture as an optimistic rollup.
Q: Is OP the same as ETH on Optimism? A: No. ETH is used as the gas token on Optimism, just as it is on Ethereum mainnet. OP is a separate governance token used for voting in the Optimism Collective, which allows participation in protocol management.
Q: Can I add Optimism without using Chainlist? A: Yes. You can add the network manually by entering the required network parameters via the "Add a network manually" option in MetaMask.
Q: Why is my token not showing up on Optimism after a transaction? A: Sometimes MetaMask is unable to detect a token automatically. You can add it manually through the Assets tab by clicking "Import tokens" and entering the token's contract address on the Optimism network, which is different from the same token's address on Ethereum mainnet.
Q: Are gas fees on Optimism always lower than on Ethereum mainnet? A: Usually, yes. Fees are reduced because transactions are batched, but they may increase during periods of high Ethereum mainnet gas prices because part of the cost is tied to posting data back to mainnet.
Q: How can I tell if an "Add Optimism" prompt is legitimate? A: Always check that the chain ID is 10 and that the RPC endpoint matches the official one. A different chain ID or an unfamiliar RPC address can indicate a phishing attempt designed to intercept your transactions.