Usefulness of having an AJAX API Key

The Google AJAX Feed API lets you download any public Atom or RSS feed using only JavaScript. You do not need a key to use this API. Using a key in your application/site is completely optional. However, it is useful to have one. Here is why - when a key is present, if we detect any problem or issue that involves your application/site, with a key in hand, we will attempt to contact you. If we do not have a key, we have no way to contact you should something go wrong.

If you are ready, go ahead and sign up for an API key