{"name":"dmarc-check","description":"DMARC + SPF + DKIM email-authentication checker / mail-auth posture audit / spoofing-resistance grader / phishing-readiness scanner / domain email security score / dmarcian-style report / pre-send deliverability check. Reads the domain's DNS TXT records, parses each protocol's record (SPF mechanisms + qualifiers, DMARC tags p/sp/rua/ruf/pct/aspf/adkim, DKIM selectors with key bits and algorithm), and returns a 0-100 score, A-F grade, and per-finding human-readable reasons explaining the score.","price":"$0.02","method":"POST","input_schema":{"properties":{"domain":{"type":"string","description":"Apex domain to audit (e.g. 'google.com'). Resolves SPF/DMARC TXT at the domain and at _dmarc.<domain>."},"dkim_selectors":{"type":"array","items":{"type":"string"},"description":"Optional list of DKIM selectors to probe (e.g. ['google', 'selector1', 's1']). Defaults to a common-selector probe set."}},"required":["domain"]},"input_example":{"domain":"google.com"},"output_example":{"domain":"google.com","score":85,"grade":"A","reasons":["SPF ~all soft fail (lenient)","DMARC p=reject (strict)","No DKIM record found in checked selectors (may exist under custom selector)"],"spf":{"record":"v=spf1 include:_spf.google.com ~all","version":"v=spf1","all_qualifier":"~all","mechanisms":["v=spf1","include:_spf.google.com","~all"]},"dmarc":{"record":"v=DMARC1; p=reject; rua=mailto:...","policy":"reject","subdomain_policy":null,"pct":100},"dkim":{"selectors_checked":["google","selector1","default"],"records_found":[]},"source":"live DNS"},"x402_payment_required":true,"x402_facilitator":"https://api.cdp.coinbase.com/platform/v2/x402"}