Per-day maximum API calls limitation

How do I setup my account to limit the allowable maximum number of API calls per day/week/month?
I was not able to find it under the MyAccount or Billing tabs.

We do no impose or place limits on the number of requests you can make per day. It is the responsibility of your application to control the request rate if you want to have your own restrictions. However, we are investigating the possibility of implementing server-enforced usage limits for the next version of FlightXML.