[problems]

I've used similar to scrape real estate data. Reverse engineering mobile APIs is often the most consistent way to get programmatic data access these days. Just grabbing a bit of data as a user this isn't a big deal - but I wouldn't want to base my business around it, it seems like there are too many opportunities for that to blow up in your face.

What happens if the banks realize you're doing this and just block your IPs? What happens if they decide to go after you legally because you reverse engineered their applications and are benefiting from it commercially - you'd have a decent argument, but are you prepared to go to court with it?

Then again I guess the screen scrapers have gotten away with it for a fairly long amount of time, so maybe it's not a concern...