We do not disclose the specifics of our rate limiting procedures at this time, although the limits are high enough for normal use. If you receive error messages from our API, please contact us at email@example.com and include in your message your username, API key, and details about how your application is using our API. Please ensure that you are not making unnecessary API calls (i.e. shortening URLs on page load instead of when a user explicitly clicks a 'share' button). Rather than contacting us in anticipation of a high volume of requests, in most cases it is best to wait until you encounter the limits so that we can better understand your specific needs.