MixRank is a spy tool that tracks usersâ€™ competitorsâ€™ advertisements. It provides analytics on where competitors buy traffic, which of their ads perform best, and more. The API provides access on-site information on ads, advertisers, and traffic sources. This allows developers to generate custom reports from queries to MixRankâ€™s entire historical database. The API is currently private, but can be accessed by requesting permission from MixRank.