With the OpenGround API, there is a rate limit on the number of requests you can submit within a certain period of time.
How this works is that you start with a bucket of 500 requests, which is recharged at 60 requests per minute up to a maximum of 500 requests.
You can see your remaining requests by inspecting the 'X-Rate-Limit-Remaining' response header.
Rate Limits apply per user for Authorization Code (User Login) authentication and apply per Client ID for Client Credentials (Machine Login) authentication.