Application programming interfaces (APIs) are provided that provide functionality of accessing, ranking, scoping, enrichment, cleansing, and cohort determination of content based on a corpus of trusted sources. For example, in response to receiving a request for ranked objects via a ranking API, a system can obtain objects from a corpus identified by the request for ranked objects and a corresponding rank and/or score of each of the objects and provide the objects and the corresponding rank and/or score of each of the objects to a source of the request for ranked objects, wherein the corpus stores identified trusted sources that are scored based at least on a document activity score.