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We already have a web application that pulls certain metrics about websites using the Mozscape API, but we are wanting to extend the usefulness of this application to enable users of the app to pull "Keyword Difficulty" metrics in bulk, instead of one at a time (or 5 at a time). I wouldn't mind the 5 at a time limitation if we could just automate the API calls and let the tool pull data for 50 or so keywords without user-interaction. I know that it's a "formula", but I don't know what SEOMoz uses for it's formula. Has anyone figured out a way to calculate this, based on the Mozscape API data?  Has anyone ever tried to reverse engineer this metric?