The Blacklist basically gives you a list of AdWord publishers that have very low payouts. It is a fact that ad space is valuable– I would rather fill my ad space with 3 publishers offering $0.50 per click than 3 publishers offering 1 or 2 cents. By providing a list of provider domains to avoid, you can filter your ads and have a greater chance of having high-paying publisher ads displayed on your site. According its website, Blacklist works by:

Here is the site address Blacklist