Are there any cloud services that provide categorization to natural language questions via API?
Yes, there are many. This is usually referred to as named-entity recognition, one of the common tasks of natural language processing, and works for any sentence or phrase, not just questions.
Alchemyapi.com offers a number of related APIs, including:
Mashape.com API marketplace also includes a variety of options:
- Entities API Documentation
- Entity Extraction API Documentation
- Noun Entity Extraction – Noun Phrase – Part Of Speech Tagger ALPHA API Documentation
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