Financial data
Financial data is available from Yahoo and Google Finance. It would be nice to have zero click on this. In fact it is possible to do some basic HTML5 graphics with the customer querying the JSON apis. So this shouldn't put a big strain on your servers.

If you'd like some help on this, I've done a while back some demos with this and have available code. It's not as hard as it sounds, it's mostly about knowing what to pull from where. Yahoo Finance's JSON API is much nicer than Google's.
posted by [Old Forum alecco] • 8 years and 4 months ago Link