{"name":"dmarc-check","description":"DMARC / SPF / DKIM checker. Email-authentication audit. Returns 0-100 score + grade A-F + per-protocol parsed fields.","price":"$0.02","method":"POST","input_schema":{"properties":{"domain":{"type":"string"},"dkim_selectors":{"type":"array"}},"required":["domain"]},"input_example":{"domain":"google.com"},"output_example":{"domain":"google.com","score":95,"grade":"A"},"x402_payment_required":true,"x402_facilitator":"https://api.cdp.coinbase.com/platform/v2/x402"}