Enabling API Publishing, allows you to control which users can access an API of a project. When API Publishing is enabled, the User Management menu item is added to the Home menu. Invited users can then be provided with client credentials for basic authentication to access the API.
Public URL is the base URL for the endpoint.
To enable API Publishing, follow these steps.
From the Home menu, select API Publishing.
Scroll down to Settings and set the Enable / Disable slider to On
You can now implement access roles and rate limits for the endpoints in a project.