Comment by djb_hackernews

Straight screen scrapin' yo. I worked for a similar startup that collected more detailed information than yodlee/mint, it was a product for financial managers instead of consumers. We collected over a 1mil transactions per night from over 3000 financial institutions. It was no joke. You might think screen scraping is silly but the bottom line is if a bank had an api (OFX, and very few do offer OFX) or formatted data downloads(csv,xls) the data tended to be stale or incorrect. Reasoning behind that is more eyeballs are on the web pages and so bugs/inconsistencies are noticed quicker. There was more of an expectation for the web pages to be accurate.