I do not browse the forums regularly anymore. If you need me for anything (asking questions or anything else), then PM me (be descriptive in your PM, message containing only a link to a thread will be ignored).
I noticed that web API key require registering your domain. Doesn't this imply that it will check the domain from which the request is coming to verify. If it does, then coming directly from the server wouldn't work. I browsed through the agreement but didn't see anything specific about this.