API call limits
The Police API call limit operates using a 'leaky bucket' algorithm as a controller. This allows for infrequent bursts of calls, and allows you to continue to make an unlimited amount of calls over time.
The current rate limit is 15 requests per second with a burst of 30. So, on average you must make fewer than 15 requests each second, but you can make up to 30 in a single second.
You can learn more about the leaky bucket algorithm, here.
HTTP headers and response codes
If you exceed the limit stated above, the API will return a HTTP 429 (Too Many Requests) response code.