Change watch for mta sts tlsrpt check: runs the check and compares it with the result from your previous call for the same domain (kept 90 days), returning the current answer, changed true/false, exactly which fields changed with before/after values, and when it was last seen. Call it on a schedule to be told when mta-sts and tls-rpt check for a domain changes. $0.01 per check.