this will be a subscription service (not free)
The bitcoin global market must be the first free market, this has to be the basic property.
Nowadays markets are not free, exchanges are behind brokers,
live datafeeds for subscribers only and so on and on..
That's why i'd quit trading the usual stuff,
there simply was not enough philosophy involved..
You go spend 2+ years on building the best real time data website out there, establish server infrastructure, hunt down bugs, add features for noisy users, and then release it to the public for free