The number of API calls per hour is based on your plan and employee count. By default the following rates will apply:

Rate limit per hour
Sprout Employees Count
Blossom and Garden
5 * Employee Count
8 * Employee Count

If you have a custom employee count, for example, let's say you are part of the Blossom plan and subscribed to the 200 employee bucket, you are rate limit is 5*200 = 1000 calls/hour. 

If you are looking to increase your API limit, please drop an email to with a complete description of your use-case and we'll help you sort this out.