Is there an RestAPI available for the EdgeADC?

Yes. The EdgeADC uses RestAPI and it is available for use here: https://app.swaggerhub.com/apis/Edgenexus/EdgeAPI/4.2.3

Support is available for licensed users who have a valid and up to date support contract.

Access to the ADC’s RestAPI can be limited by using the settings found in System > Security.