Oh hey, that's awesome, I was under the impression there wasn't any free data sources available. This would make FinTech way more accessible for startups. Which ones do you use?
Shoot me an email at chintan@capp.io and I can go into more detail :)
Quandl[1] is one such resource of free stock data.
[1] Quandl.com
Quandl is great but be sure to truly understand their ToS correctly - they pull a lot of their data from sources that forfeit (or dont explicitly allow) public/for profit redistribution