With LEX and Polly anyone can essentially build its own Alexa chatbot nowadays. Alexa will just be Amazon-version of it. I expect more apps and more devices wil

With LEX and Polly anyone can essentially build its own Alexa chatbot nowadays. Alexa will just be Amazon-version of it. I expect more apps and more devices will compete with Alexa as different products. Api.ai from Google can also be integrated into many popular apps(twitter,facebook messenger,etc), not sure if it's apps-agnostic, i.e. I write an Android app and can use google assistant directly, do I need any special API-key or something from Google first?