is there an endpoint we can query using a page access token and sending the feed targeting parameters to get estimated reach?

Question

Is there an endpoint we can query using a page access token and sending the feed targeting parameters to get estimated reach?

There isn't anything documented about how to get to this information, although it is available to adgroups: https://developers.facebook.com/docs/reference/api/page/#targeting

Answer 1

Have you looked into the Facebook Insights API? https://developers.facebook.com/docs/reference/api/insights/