I'm trying to add a number of URLs to be monitored by diffbot and I get a 400 "The request sent by the client was syntactically incorrect (You have requested too many feeds, too quickly. Try again later!)"

What exactly is the rate limit? Is it possible to remove it all together? If not, how can the clients discover it so they can back-off? For example, it'd be great if each response would also return the amount of requests left and when the next reset is.