Android : Instagram API Is there a way of knowing if a user blocked logged user?

I am looking through all endpoints on instagram's api: https://instagram.com/developer/endpoints/#

After I get the authrization token I can do all the operations: like/change relationship/view user detais...

However, I see that some apps on android have this extra feature: see who blocked the currently logged on user. There is no mention on the API for this and when I try to query the details for a user, instead of showing is_private/blocked_you all I get is:

{
        "error_type": "APINotAllowedError",
        "code": 400,
        "error_message": "you cannot view this resource"
    }

Which makes sense, since the user is blocked and no info should be returned. But in this case, how do other apps get this "User has blocked you" info?