Illocution Inc. is a big data consortium devoted to large-scale text and document analysis. They provide several applications for keyword tracking, trend tracking, lexical analysis, and more. They have also built some corpora and lexicons. The Upzilla API exposes the functionality of their raw trend data feed. Users can define parameters for the span and amount of data they want returned. It is a RESTful API that returns JSON results.
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So far, we don't have a record of any changes to this API