If a Web API exposes public endpoints, but there is no client application there to consume it, does it really exist? Without getting too philosophical, let's go over the possible ways you can consume a client application.
You can do any of the following:
Consume the Web API using external tools
Consume the Web API with a mobile app
Consume the Web API with a web client
If you don't have a client application set up, you can use an external tool such as Fiddler. Fiddler is a free tool that is now available from Telerik, at http://www.telerik.com/download/fiddler , as shown in the following screenshot:
You can use Fiddler to inspect URLs that are being retrieved and submitted on your machine. You can also use it to trigger any URL, and change the request type (Get, Post, and others).