...and react under one second?    

I wrote a solution + article on how to ingest/query/visualize trading data in real-time at scale on Google Cloud Platform as a foundation for TFX (TensorFlow extended) AI pipeline. If you run it you can see multi exchange real time chart like this:

http://35.222.140.56:5000/stream

Medium post:  https://medium.com/@igalic/bigtable-beam-dataflow-cryptocurrencies-gcp-terraform-java-maven-4e7873811e86
GitHub link:  https://github.com/GoogleCloudPlatform/professional-services/tree/master/examples/cryptorealtime

Enjoy!

Ivo