A question you might ask yourself when you look at Expired Domains is "How much traffic does this domain get?". Unfortunately you can't look into the analytics of the previous owner. This is where services like Alexa and SimilarWeb come into play. They estimate from certain data points how many visits websites get and ranks them accordingly.
Alexa is around for almost 20 years now, but they moved more and more options from their free version to paid plans. Luckily for a couple of years now we have SimilarWeb. They also have a paid plan, but you can already see a lot of information in the free version! Just compare these two links for Cnn.com (Alexa | SimilarWeb).
SimilarWeb also provides an API and I'm happy to announce that I have implemented it. You can now see the SimilarWeb Global Rank for the Domains on ExpiredDomains.net. If it doesn't have a Rank, it is represented as 0. To save up space I have removed Alexa from the default Listing, but you can still find it in the Column Manager and add it again if you want.