Yes, you may add the option to add other users to the account as well as add an admin role. In order to do this:
Login to the Customer Portal: https://customerportal.coinapi.io/login.
Navigate to "Team Members": Once you are inside the portal, navigate to the "Team Members" section
Add Email Address: Invite team members to join your account by entering their email addresses.
Assign the Designated Role: As the account owner, you hold the reins to assign roles. Choose between "Admin" and "User" roles, each with distinct capabilities.
Both Admin and User roles can log in to the account, although the Admin role basically has the same capabilities as the owner of the account, such as adding new subscriptions, editing billing information, etc.