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.
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So far, we don't have a record of any changes to this API