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How to add a custom network

MetaMask lets you connect to many different networks. Before adding one manually, check whether it’s already supported by default.

Default networks

Ethereum • Linea • Base • Solana • Bitcoin • Polygon • BNB Chain • Arbitrum • OP • Sei • Avalanche • zkSync Era

On both Mobile and Extension, you can easily add several networks with just a click:

  1. Click on the menu in the top right and select 'Networks'.

MetaMask extension dropdown menu networks

  1. Scroll down until you see the 'Additional networks' section and click 'Add' next to the network you wish to add.

MetaMask extension networks menu add additional network

また、検索バーでネットワークを検索して追加することもできます。

MetaMask extension networks menu search for network

Adding a network manually

If you don’t see a desired network in the list, you can follow these instructions to establish the network connection manually:

  1. Click on the menu in the top right and select 'Networks'. これにより、すでに追加されているネットワークのリストが表示されます。

MetaMask extension dropdown menu networks

  1. Click 'Add a custom network'.

MetaMask extension networks menu add custom network button

  1. 追加するネットワークの情報を入力できる画面が表示されます。 「保存」をクリックしてネットワークを追加します。

MetaMask extension add custom network modal form

Adding or editing RPC URLs

RPCとは、「remote procedure call」 (遠隔手続き呼び出し) の頭文字を取ったもので、(MetaMaskのような) クライアントがブロックチェーンとやり取りできるようにする一連のプロトコルのことです。 You can add multiple RPC URLs for a single network and edit the default RPC URL from your list of networks in both Extension and Mobile settings.

注記

Adding a custom RPC URL to Ethereum, Linea, Base, Arbitrum, or BNB Smart Chain RPC will disable Smart Transaction capabilities like MEV protection. To re-enable this, you'll need to switch back to the default RPC URL from network settings.

  1. Click on the menu in the top right and select 'Networks'.

MetaMask extension dropdown menu networks

  1. Locate the desired network you want to edit and click the 3 dots to edit.

MetaMask extension networks menu edit network details

  1. Select the Default RPC URL dropdown field and click “Add RPC URL”.

MetaMask extension networks menu edit network add rpc url

  1. Enter the URL, nickname, and save your configurations.

You can now toggle between various RPC URLs when you want to switch providers. To delete any RPC URL, follow the same steps above and click on the trash bin icon to delete.

Networks across devices

Adding a network on one device does not mean it will appear on another device when accessing the same account. If you add it on Extension, it will not automatically be added to your MetaMask Mobile app yet, and vice versa.

Custom networks will also need to be re-added if you uninstall the browser extension or mobile app (after which you'd need to restore your wallet using your Secret Recovery Phrase).

Adding via Chainlist

当社はChainlistのネットワーク情報を管理していないことにご注意ください。 追加する前に、ネットワークの詳細が正確であることを確認してください。

For another way of adding networks to MetaMask, go to chainid.network, where you can connect MetaMask and add networks with a few clicks.

  1. chainid.networkで、Chainlistサイトに移動します。

  2. Firstly, you'll need to connect your MetaMask to the site. Select 'Connect' in the top right to do so.

Chainlist connect to site button

When successful, the address of our selected account will replace the 'Connect' button:

Chainlist connected address

  1. ここで検索バーを使用して、接続するネットワークを見つけます。 見つかったら、「チェーンを追加」ボタンをクリックします。

Chainlist add chain button

  1. MetaMask自体が動作を開始し、承認メニューを表示します。 Click 'Confirm' to proceed.

MetaMask extension add network from chainlist confirmation

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