{"uid":"cap_uCXnU1ExkEudUyXhm62fq","slug":"prompt-guard-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-dd2f8f82","name":"B2A Email Deliverability, MX, SPF & DMARC Verifier","description":"Validates email syntax, disposable/burner provider status, role accounts, and live DNS MX/SPF/DMARC records. (Live x402 v2, IETF MPP & MCP endpoint at https://prompt-guard.agentdiet.dev/v1/mx-check)","url":"https://prompt-guard.agentdiet.dev/v1/mx-check?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","required":["email"],"properties":{"email":{"type":"string","minLength":1,"description":"Email address to validate for syntax, MX deliverability, and disposable risk"}}},"responseSchema":{"type":"object"},"example":null,"exampleRequest":null,"tags":[],"displayCostAmount":"0.005","displayCostAsset":"USD","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.005/call","primary":{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_3iyldlg7O7OTAxFWNKe6q","protocol":"mpp","methodType":"crypto","chain":"tempo","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":"prompt-guard.agentdiet.dev","brandSlug":"prompt-guard-agentdiet-dev-mpp","brandBaseUrl":"https://prompt-guard.agentdiet.dev","brandDocsUrl":null,"whatItDoes":"Validates an email address for syntax correctness, disposable/burner provider status, role-account detection, and live DNS MX, SPF, and DMARC record presence","exampleAgentPrompt":"Can you check whether john.smith@acmecorp.com is a real, deliverable email — specifically whether it passes syntax checks, isn't a disposable burner address, and has valid MX, SPF, and DMARC DNS records set up?","exampleUseCases":[{"title":"Pre-send lead list email hygiene","prompt":"Before I send my outreach campaign, verify that sarah.jones@prospectco.io is a legitimate deliverable email — not a burner or role address — and that the domain has MX and SPF records set up properly."},{"title":"New user signup fraud check","prompt":"A user just signed up with noreply@mailinator.com — can you check whether that's a disposable throwaway address and whether the domain even has valid MX records so I know if I should block the registration?"},{"title":"B2B contact enrichment validation","prompt":"I pulled a contact email cto@startup.xyz from LinkedIn — can you verify it's syntactically valid, not a role alias, and that startup.xyz actually has MX and DMARC DNS records configured before I add it to my CRM?"}],"resultDescription":"Returns a structured object indicating: email syntax validity, whether the domain uses a known disposable/burner email provider, whether the address is a role account (e.g. info@, admin@), and the presence/validity of live DNS MX, SPF, and DMARC records for the email domain — enabling a comprehensive deliverability and fraud-risk assessment.","failureModes":["Invalid or malformed email string provided — returns syntax error","Domain does not exist or has no DNS records — MX/SPF/DMARC fields return absent/null","DNS lookup timeout for the domain — may return partial results","Rate limiting or payment failure (HTTP 402) if USDC micropayment is not settled","Empty email parameter — required field validation error"],"whenToPreferThis":"Choose this endpoint when you need a comprehensive, single-call email check that combines syntax validation, disposable-provider detection, role-account flagging, and live DNS MX/SPF/DMARC record verification — particularly in B2B lead enrichment, user signup fraud prevention, or pre-campaign list hygiene workflows where deliverability and security posture matter. Prefer it over simple syntax-only validators when DNS record correctness is critical.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T07:21:42.618Z","isFirstParty":false,"canonicalSlug":"prompt-guard-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-f0765224"}