From their site: Compete SnapShot provides information for every site on the internet including site traffic history and competitive analytics a list of available promotional codes across thousands of online retailers and site-specific trust scores based on up-to-the-minute data from Compete and third party security services. Your site or application can display some of Competes most powerful data by using the Compete SnapShot API.
Our API directory now includes 39 statistics APIs. The newest is the NISS API. The most popular, in terms of mashups, is the Compete API. We list 13 Compete mashups. Below you'll find some more stats from the directory, including the entire list of statistics APIs.
Sometimes, when assessing a website, it helps to know how popular it is. These days, there are a lot of ways to learn this, including a few recent mashups. There are also other apps that assess popularity, using different APIs and analysis to do so. Below we have a selection of some of the recent mashups that dig into determining ranking and popularity.