{"uid":"cap_Rkre1aYdxZCTSRr7kSSMH","slug":"prompt-guard-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-2ba97e85","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/email-validator)","url":"https://prompt-guard.agentdiet.dev/v1/email-validator?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_0S0gWEsDcuqHAcbh2iQu2","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 detection, role account flags, and live DNS MX, SPF, and DMARC record checks to determine deliverability.","exampleAgentPrompt":"Can you check whether john.doe@example.com is a real, deliverable email address — specifically whether it passes syntax checks, isn't from a disposable provider, and has valid MX, SPF, and DMARC records on the domain?","exampleUseCases":[{"title":"Screening signups for fake emails","prompt":"Before I onboard this new user, can you verify that their email signup@tempmail.io is legitimate — check if it's from a disposable provider and whether the domain actually has working MX records?"},{"title":"Validating B2B leads before outreach","prompt":"I have a lead with the email james.harris@acmecorp.com — can you confirm it's syntactically valid, not a role account, and that the domain has SPF and DMARC records set up so my emails will actually land?"},{"title":"Email hygiene before a marketing send","prompt":"I'm about to send a campaign to newsletter@clientdomain.net — can you check if that's a role-based address and whether the domain's DNS has MX and SPF configured so it's actually deliverable?"}],"resultDescription":"Returns a structured object indicating whether the email address passes syntax validation, whether the domain is associated with a known disposable or burner provider, whether it appears to be a role account, and the live DNS lookup results for MX, SPF, and DMARC records on the domain.","failureModes":["Missing or malformed email parameter returns a validation error","DNS lookup timeouts for domains with misconfigured or slow nameservers","False negatives on newly registered disposable domains not yet in blocklists","Payment failure or HTTP 402 if x402 payment is not properly handled","Empty or null email string rejected by minLength constraint"],"whenToPreferThis":"Choose this endpoint when you need comprehensive, multi-signal email validation in a single call — covering syntax, disposable/burner detection, role account flagging, and live DNS MX/SPF/DMARC verification simultaneously. It is particularly well-suited for B2B lead enrichment pipelines, signup fraud prevention, and pre-send email campaign hygiene checks where deliverability confidence matters. Prefer it over basic regex-only validators when real DNS health checks are required.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T07:25:23.861Z","isFirstParty":false,"canonicalSlug":"prompt-guard-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-f0765224"}