CashEdge supports aggregation as well: <a href="http://cashedge.com/products-financial-information.php" rel="nofollow">http://cashedge.com/products-financial-information.php</a><p>A PFM solution called HelloWallet uses them: <a href="http://www.hellowallet.com/2010/03/09/alldata-account-aggregation-solution-from-cashedge-to-power-hellowallet/" rel="nofollow">http://www.hellowallet.com/2010/03/09/alldata-account-aggreg...</a><p>I can't speak to the quality or cost of the API though.<p>I do know (as an ex-Yodlee employee) that the Yodlee bank API, although not extremely intuitive, is very powerful and heavily used by a lot of institutions.<p>Will
-ex-Yodlee (04-08)
-Freelance Yodlee Consultant (now)
Wesabe has an API, but I believe the documentation is offline. See <a href="https://www.wesabe.com/groups/50-wesabe-api-developers/discussions/4126-what-happened-to-api-web-site" rel="nofollow">https://www.wesabe.com/groups/50-wesabe-api-developers/discu...</a> for a bit more on that.