Alexa's certified program and pro metrics.
http://www.alexa.com/siteowners/certify
Analytics and Tracking · Audience Measurement · Visitor Count Tracking
Get access to data on 346,970 websites that are Alexa Certified Site Metrics Customers. We know of 41,609 live websites using Alexa Certified Site Metrics and an additional 305,361 sites that used Alexa Certified Site Metrics historically and 20,736 websites in the United States.
Get a list of 346,970 websites using Alexa Certified Site Metrics which includes location information, hosting data, contact details, 41,609 currently live websites and an additional 77,108 domains that redirect to sites in this list. 305,361 sites that used this technology previously and 20,736 websites in the United States currently using Alexa Certified Site Metrics.
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