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How to connect MetaMask to Optimism (Ethereum)

How to connect MetaMask to Optimism (Ethereum)

The following guide will help users understand how to connect their MetaMask wallet to the Optimism (Ethereum) layer two scaling solution. The article will provide a short review of what Optimism really is and why it can benefit users who choose to process their crypto assets through the Optimism network. Lastly, a short 3-step guide will explain how to easily connect MetaMask to Optimism following two simple methods – automatically and manually. If you are reading this article and you are still unaware of what MetaMask is, then please check out one of our previous blog posts on how MetaMask wallet works.

What is Optimism?

In short, Optimism or Optimistic Ethereum is a rollup scaling solution which allows users to execute transactions on the Ethereum network. Transactions are processed quicker and for a much lower gas cost than the Ethereum network itself.

Originally, the Optimism team have been building an Optimistic rollup-based Ethereum scaling solution since June 2019. Currently, the solution’s main aims are to add more value to Ethereum and to continuously decrease gas fees. Optimism is one of the Layer 2s which is showing great success so far quite similar to the Arbitrum bridge. The Optimism team has also secured various multi-million investments which contribute to sustaining the project and its improvement.

On the technical side, the Ethereum Layer 2 scaling solution – Optimism, uses optimistic rollups to achieve lower fees, improved and lower latency as well as better throughput as opposed to Ethereum Layer 1 alone. In addition, it also provides a bespoken developer and user experience which is quite evident from the Optimism website.

Moreover, the Ethereum development paradigms allow for easy transitioning from a developer point of view. For example, there are no new programming languages, there are few code changes to already existing smart contracts and there is an existing efficient support for existing Ethereum tools.

Optimism also shows huge success as it has launched an OVM (Optimistic Virtual Machine) with a decentralized exchangeSynthetix. According to Optimism, Synthetix users are already enjoying high transaction speed and cost savings. Another major decentralized protocol integration is related to Optimism with Uniswap.

Benefits using Optimism

Optimistic rollups work in parallel to the main Ethereum blockchain on layer 2.They offer improvements and are more scalable, because there is no computation involved by default. Rather, after a transaction is completed, they offer the new state to Mainnet or in other words Optimistic Ethereum "notarizes" the transaction.

Another benefit regarding Optimistic rollups is that transactions are executed on to the main Ethereum chain as call data. This process optimizes them further by reducing the gas cost and as many users are aware – high gas costs are not satisfactory.

The current default is that generally computation is the slow and is an expensive part of using Ethereum. As such, Optimistic rollups can offer up to 10-100x improvements in scalability dependent on the transaction. This number will increase even more with the introduction of shard chains as more data will be available if a transaction is disputed.

Why connect Optimism to MetaMask?

Similar to Arbitrum, there are multiple benefits that allow users to benefit from scaling from layer1 to layer 2. In addition to that, they can benefit from arguably one of the best wallets for storing digital crypto assets users can find the best transaction prices every time. The MetaMask wallet secures prices from different aggregators and markets in order to remain consistent with its 0.875% service fee.

The importance of connecting the wallet to Optimism is also related to slippage protection. Large swaps are usually associated with swift price changes whenever there is not enough liquidity available on a specific decentralized exchange. Therefore, swapping tokens with MetaMask is an automated process which allows user orders to be spread across all DEXs in order to reduce the impact of slippage.

How to connect MetaMask to Optimism in a few steps

The following short guide will explain how to easily connect Optimism to the Ethereum wallet – MetaMask, by following a three simple steps.

Step 1.

Initially, users must be registered with MetaMask and have the browser extension enabled. If a user is not registered to MetaMask, then this can be achieved by installing the MetaMask wallet from their website.

MetaMask wallet homepage.

Alternatively, users can visit the browser extension marketplace and download the MetaMask extension which will achieve an identical result.

MetaMask wallet Google Chrome extension.

Step 2.

The next step is to create a MetaMask wallet or to import an existing one by using the browser extension feature.

MetaMask wallet on the Google Chrome extension bar.

Step 3.

After the previous steps have been completed, in order continue the and set up MetaMask with Optimism, users have to either complete this process automatically or they can add a custom RPC network manually.

Connecting to Optimism automatically

Currently, this is the easiest and most efficient method to link Optimism to your layer-two MetaMask wallet. All you have to do is visit the Optimism gateway page at and if you have MetaMask already set-up, then their website will prompt you to connect your wallet by clicking on the button located at the top-right corner of your screen labelled Connect Wallet.

Optimism (Ethereum) gateway page.

Ultimately, anew Notification page will open from your browser extension and will ask you to confirm your details in order to proceed forward. After that, confirming details and continuing forward you will now have successfully connected your MetaMask wallet to Optimism.

Connecting to Optimism manually

To accomplish this, users have to open up the browser MetaMask extension and to select the Network button titled Ethereum Mainnet which will open a drop down menu.

MetaMask wallet network selection button.

The dropdown menu where Custom RPC must be selected should resemble the image below:

MetaMask wallet network dropdown menu.

From there, users have to navigate and click on the Custom RPC option will prompt them to input data. The data includes: network name, new RPC URL, chain ID, currency symbol and block explorer.

Custom RPC Network input form.

Users can enter the following Optimism RPC network input data below:

Network Name: Optimistic Ethereum


Chain Id: 10

Currency Symbol: ETH

Block Explorer URL:

Once users have completed the correct data input and have clicked on Save, then they will be able to switch to Optimism from the application’s dropdown list in the future. As a result, MetaMask and Optimism will be successfully linked. Here is an image of the correctly completed custom RPC:

Custom RPC Network completed form.

After completing all steps accordingly, your Ethereum wallet should be successfully connected to the Optimism network. If you enjoyed reading this article, please visit our Blog page or if you would like to learn more about the services our company offers, then definitely check out the Services page.


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