The World’s Biggest AI Engines: A Comparison
Oksana Oboishchyk
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Hello, Oksana! Thanks for sharing this great summary about AI providers. I would like to recommend you to take a look at API.ai and Wit.ai as well.

You've said that "there is no single API that does intent and entity recognition in a single call", but if you look at Conversation API, you will see that's possible: https://watson-api-explorer.mybluemix.net/apis/conversation-v1#!/message/message