I am trying to access the vCOPs api info via this url - https://vcop-ip/HttpPostAdapter/OpenAPIServlet
but it is popping up with a login box. Not matter what username and password I enter, it comes back with same login box
Am I not able to access the API because I am using the foundation version?
The foundation version can't really leverage any custom data in the form of dashboards or otherwise, so I wouldn't expect you to see much benefit from leveraging that adapter in Foundation. What's the use case?