Alchemy

https://www.alchemy.com/ to create a custom Arbitrum RPC endpoint

Creating a New Account

alchemy.com home page

Alchemy sign-up and login screen

Navigate to https://www.alchemy.com/ and create an account. This is a standard account creation. Enter your info or sign in with Google.

When logging in for the first time a prompt to create an app will appear. This is the same dialog as the next step, Create App for Keys.

Create APP for Keys

Alchemy dashboard. click "create app" for key

Once account creation is complete the Alchemy dashboard can now be accessed. We need an HTTP link to create a custom network in MetaMask. To do this click 'CREATE APP' as shown above.

Change to Arbitrum

Add a name and description. Ethereum Mainnet is selected as the chain default. Under 'CHAIN' drop-down box select 'Arbitrum'. Under 'NETWORK' drop-down box select 'Arbitrum Mainnet'

Network changed to Arbitrum

Once complete, make sure Arbitrum and Arbitrum mainnet are selected and hit 'CREATE APP' You now have access to endpoint links for the Arbitrum One network.

View API Keys

Alchemy dashboard with created app

With the app now created, we can see it listed on the Alchemy dashboard. We now have access to endpoint links for Arbitrum.

"VIEW KEY" pop up

HTTP is the link needed to create a custom RPC network in MetaMask. Copy the HTTP link from the 'VIEW KEY' pop-up box and jump to Add Custom Network to MetaMask to complete the setup.