www.newsonrails.com publishes Google's 100 hot trends. I see they are real because Google responds on the request like google.com/trends/hottrends?q= ... and key words from www.newsonrails.com. Is there any API to get hot trends over 40s?

I don't know the API which allows to request the list of >40 trends, according to Wikipedia it's still unpublished.
But www.newsonrails.com is a rock. I use for 1 week now for my blogs.