2 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.
SPF exp mechanism(s) for a domain: the explanation record. Reads the SPF TXT record (Cloudflare DoH) and returns just the exp entries with their qualifiers, plus the full record and the DNS-lookup count. One-field answer...
Change watch for spf mechanism exp: runs the check, compares it with the result from your previous call for the same domain (kept 90 days) and returns the current answer, changed true/false, the fields that changed with...