Moz introduced Brand Authority, a new metric designed to gauge online brand strength, at MozCon. What Is Moz’s Brand Authority? The Brand Authority metric capitalizes on Moz’s search data and proprietary algorithm, offering marketers insight into their brand’s performance and avenues for. Available on Moz Pro and through the Moz API, Brand Authority provides a measurable brand performance index for marketers and PR professionals. Top US Brands Based On Brand AuthorityCoinciding with the launch of this novel metric, Moz released a list of the top 500 US brands based on Brand Authority scores.