How do I know if I'm using the production API or the beta API?

Word just came to me that someone else in our organization was notified by MediaSilo that we were using the beta API instead of the production API. This was news to us, because there is no outward indication that the API we're addressing isn't production. We are using the URL https://api.mediasilo.com/v3/. All the calls we're using came from the docs.mediasilo.com. How do we make sure we're addressing the correct, production instance of the API?