#1 - April 13, 2011, 11:49 p.m.
Blizzard Post
Authentication and registration is something new that we plan on introducing to the community. What we want to do is ensure that we are providing fair, open and stable API services to the community, developers and our partners. Using a simple, voluntary registration model is the best way, we feel, to go about doing so.

First, I’d like to stress the fact that registration to use the API is voluntary and if you opt not to register an application but would like to use the API anyway, you can do so. The benefit to registering an application and using that application’s credentials to access the API is that you are allowed to make more requests than anonymous consumers of the API.

More information about how to register will be available as we release the application service to the public.