This happened a few years ago when Yahoo BOSS started charging, back then Gabriel said they'd moved over to Bing (http://news.ycombinator.com/item?id=1612081 ht

This happened a few years ago when Yahoo BOSS started charging, back then Gabriel said they'd moved over to Bing (http://news.ycombinator.com/item?id=1612081 http://news.ycombinator.com/item?id=1612081). I'm sure they still make heavy use of the Bing API, but have since expanded their range of sources to soften the blow somewhat. They're now getting results from Blekko (who run their own index), and are I'm sure they've been building out their own index. There's a full list of sources here - http://help.duckduckgo.com/customer/portal/articles/216399-sources http://help.duckduckgo.com/customer/portal/articles/216399-s.... We also don't have any pricing details for higher volume usage of Bing, and DDG are in a much better position to negotiate a better deal these days.