From Googler Eric Case’s Blogger profile, I guess the Google AdSense API is coming soon. Eric is a team member of many(most) of the Google Official Blogs, such as Inside AdWords, Inside AdSense, Searching for Blogs and Official Google Blog.

InsideGoogle had also reported a Secret AdSense API last October…

From these evidence, I assume that Google Adsense API[currently returns a 404 page] is coming soon.

I guess he just registered this blog about an hour ago….