Getting the data is always the hard part for stock apps. My experience has been that it’s very difficult to get up to date data for free. You’ll probably have t

Getting the data is always the hard part for stock apps. My experience has been that it’s very difficult to get up to date data for free. You’ll probably have to pay for an API. You’ll probably want to anyway so that you aren’t juggling several free APIs to get the same data, or so you’re working with a mature, easy to use, RESTful API. I’ve worked with stock market APIs that are miserable to use.