{"uid":"cap_65Cs84s--uzCj1IgCWNZM","slug":"email-verification-mx-validation-api-d2daddf1","name":"Email Verification & MX Validation API","description":"One-call email verification for lead qualification and list hygiene: RFC 5322 syntax check, then a live MX lookup over DNS-over-HTTPS (Cloudflare, Google fallback). Detects non-existent domains (NXDOMAIN), null-MX domains that refuse mail (RFC 7505), and returns prioritized MX hosts. Query: ?email=someone@example.com. Verdict: deliverable | risky | undeliverable. 1h cache per address.","url":"https://x402-datashop-production.up.railway.app/v1/validate/email","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","required":["email"],"properties":{"email":{"type":"string","description":"Email address to verify (max 254 chars)"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","displayCostAsset":"USDC","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":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_nUux-Nny__mWB9qDUq9nw","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Validates an email address via RFC 5322 syntax check and live MX record lookup, returning a deliverability verdict (deliverable, risky, or undeliverable) with DNS details.","exampleAgentPrompt":"Can you check whether john.smith@acmecorp.io is a real, deliverable email address — run the full syntax and MX lookup and tell me if it's deliverable, risky, or undeliverable?","exampleUseCases":null,"resultDescription":"Returns a verdict of 'deliverable', 'risky', or 'undeliverable', along with prioritized MX host records, NXDOMAIN detection, null-MX (RFC 7505) flag, and syntax validity. Results are cached per address for 1 hour.","failureModes":["Email address missing or malformed query parameter returns an error","Domain has no MX records but is not NXDOMAIN — classified as risky","DNS-over-HTTPS upstream failure may cause lookup errors","Addresses over 254 characters are rejected","Temporary DNS timeouts may return inconclusive results"],"whenToPreferThis":"Use this endpoint when you need a fast, single-call email validation that goes beyond syntax checking to confirm actual DNS-level deliverability — ideal for lead qualification, sign-up form validation, or list hygiene where you want to detect NXDOMAIN domains and null-MX domains without running your own DNS infrastructure.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T21:08:16.204Z","isFirstParty":false}