Use this when the user asks which of a creator's, competitor's or their own posts performed best or beat the account's normal, or what works for an account before writing. Scores the latest 20, 30, 50 or 100 posts against that account's own median and says by how much each beat it. About 1 credit per post. Longer runs return a job_id for xcut_get_job. Do not use for a full metrics table (use xcut_profile_analytics) or for a topic across many accounts (use xcut_search_viral).