In Telligent Enterprise 3.0, the Platform API is enabled by default because it is required by many widgets. You do not have to enable it.

The Platform API is a set of programming interfaces that allow applications or connectors to be built on the Telligent Evolution platform. The API is implemented as a set of REST-based Web Services. All requests go through the same request processing pipeline as Telligent Evolution, so when enabled the server load may increase depending on the number of users and software tools that are accessing it.

To learn more about the Platform API, please visit the developer documentation.