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; a pattern classification module configured to generate a classification structure from the predetermined API usage patterns; 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 into a truncated set of API calls, the usage identification module further configured to determine a type of the unknown activity through an application of the truncated API call data to the classification structure determined from the predetermined API usage patterns.