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GitHub User: andrew
I've started work on a JSON api for split, in the form of another small, mountable sinatra app, the code is here (unfinished): http://github.com/andrew/split-api
I've just released the new version of Split (0.4.0, https://rubygems.org/gems/split/versions/0.4.0) that contains the new config option that Ryan mentioned that helps to avoid users participating in multiple experiments at the same time.