[elsewhen]

they have an index of the web intended to mimic google's index which they use it to provide reports to marketers. with their service, a search engine optimizer can answer questions such as.: how many incoming links does this url have?

[b4hand]

We provide a public facing API that can answer lot's of questions about URLs, FQDNs, and root domains. The example you gave is one of them. We calculate a large number of statistics about every URL, FQDN, and root domain that we know about on the web.

We also calculate MozRank which is our version of Google's PageRank as well as some in house higher level metrics like PageAuthority and DomainAuthority which are machine learning models derived from all of the other metrics we compute.