The API is rate limited at a maximum value specified in the Standard SLA Tier. Any messages beyond the maximum are rejected. Enforcement is based on the client id passed in the request.
The API will return the following X-RateLimit-* headers in the HTTP Response:
X-RateLimit-Limit defines the number of requests allowed.
X-RateLimit-Remaining defines the remaining number of requests (count).
X-RateLimit-Reset defines the time in milliseconds before the remain rate count is reset.
The following response will be generated in the event the API message rate is exceeded: