1. An application programming interface (API) analytics system comprising: a memory comprising API call data that identifies a set of API calls invoked in response to an unknown activity, and predetermined API usage patterns that each identify a series of API calls performed as a result of a corresponding use case; and a usage identification module configured to form truncated API call data in which duplicated API calls in the set of API calls are consolidated in the truncated set of API calls, the usage identification module further configured to determine a type of the unknown activity based on the truncated API call data and on a classification structure determined from the predetermined API usage patterns.