The Sauce Labs team is introducing new rate limiting on their REST API endpoints to ensure a great experience for all customers. The limits will be tracked per account basis and will limit access to 10 requests per second for logged in users, 3500 requests per hour, and 2 requests per minute for logged out users. The new restrictions will go into effect on March 1st, 2016, and customers are encouraged to modify their code to handle the new set of restrictions. To prepare, customers can opt-in using a new header with "X-RateLimit-Enable" set to "true", which will display three headers: X-Ratelimit-Remaining, X-Ratelimit-Limit, and X-Ratelimit-Reset. If the limit is reached, an error response will be returned with a Retry-After value. Customers can opt-out by setting the header to "false". The rate limiting changes will be implemented in a multi-stage process, starting from February 1st, allowing customers to test their code before the new limits are enforced on March 1st and April 1st.