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 294,893 websites Alexa Certified Site Metrics Customers. We know of 22,525 live websites using Alexa Certified Site Metrics and an additional 272,368 sites that used Alexa Certified Site Metrics historically and 8,307 websites in the United States.
Get a list of 294,893 websites using Alexa Certified Site Metrics which includes location information, hosting data, contact details, 22,525 currently live websites and an additional 50,273 domains that redirect to sites in this list. 272,368 sites that used this technology previouslyand 8,307 websites in the United States currently using Alexa Certified Site Metrics.
Countries
Financial
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Region
These are sites that we think might use Alexa Certified Site Metrics in the future because of their similarity to other sites that already do.