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Hey Harris, Moz currently offers API access to their Mozscape (formerly known as Linkscape), which is what Open Site Explorer uses, and the Followerwonk Social Authority, used for measuring Twitter engagement. As per their documentation, using their Mozscape API will only allow you to get access to these resources: URL metrics Link metrics Anchor text metrics Top pages Metadata As such, there's no Rank API available right now. Hope this helps, cheers!