yahoo is an ad exchange. That means they work as a middleman between advertisers who buy ad space and publishers who sell ad space. yahoo has been authorized to sell the ad space on 3 publisher domains. You can view these domains below.
0% of the publishers we track have authorized yahoo. yahoo's certificate ID is
e1a5b5b6e3255540. Verify here .
This information is gathered by crawling ads.txt files on millions of websites. Ads.txt is an initiative developed by Google, the IAB and others to fight ad fraud.