Hi Andre Fischer,
for OData V2 based services on a AS ABAP I can use this Endpoint to read all Services Starting with API:
or do a count:
For OData V4 I found something similar with:
but this Service has only the EntitySet ServiceGroups and no navigation attributes. So how can I read all the published OData V4 Services via a Service? I know that I can get a list of the services in Transaction /iwfnd/v4_admin via SAP GUI. But I want an API like it is available for OData V2.