{"uid":"cap_1rKHvMn5h5Yxer4aT2RGe","slug":"mx-deliverability-verifier-f7ddf0b6","name":"MX Deliverability Verifier","description":"Deterministic B2A/A2A/MCP/x402/MPP/L402 execution and intelligence node at https://mcp-gateway.agentdiet.dev settling in USDC on Base.","url":"https://mcp-gateway.agentdiet.dev/v1/mx-deliverability-verifier?utm_source=zero.xyz","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","POST"],"type":"string"},"queryParams":{"type":"object","properties":{"email":{"type":"string"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"data":{},"status":"ok","roi_proof":{"compression_ratio_pct":91.4}}},"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_VL6D9isQaCpiyLXKazv0y","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":"Verifies the deliverability of an email address by checking MX records and related email routing signals","exampleAgentPrompt":"Can you check whether the email address john.doe@example.com is actually deliverable — like, does the domain have valid MX records and will an email sent there have a chance of being received?","exampleUseCases":[{"title":"Pre-send email list cleanup","prompt":"Before I send my newsletter, can you verify that user@startup.io is deliverable so I don't waste sends on bad addresses?"},{"title":"Sales outreach lead validation","prompt":"I'm about to cold email contact@bigcorp.com — can you check if that address is actually reachable and the domain accepts mail?"},{"title":"Sign-up form email gating","prompt":"A new user just registered with the email noreply@fakesite.net — can you verify if that email domain has real MX records and is likely to receive messages?"}],"resultDescription":"Returns a JSON object with a status field ('ok' on success), a data object containing deliverability details such as MX record presence and validity, and an roi_proof field showing compression ratio. The result indicates whether the email address has valid mail exchange infrastructure.","failureModes":["Missing or invalid email query parameter — returns an error or empty data","Domain with no MX records — returns deliverability failure in data payload","Payment not settled in USDC on Base — HTTP 402 returned before processing","Malformed email address input — may return validation error or unexpected data","Upstream DNS lookup failure — service may return partial or error result"],"whenToPreferThis":"Use this endpoint when you need to quickly validate email deliverability by checking MX records and routing infrastructure before sending messages, especially in automated workflows where bounce prevention matters and per-call cost ($0.005 USDC) is acceptable. Prefer this over purely syntactic email validators when you need to confirm the domain actually receives mail, not just that the address is formatted correctly.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-22T12:42:15.571Z","isFirstParty":false,"canonicalSlug":"mx-deliverability-verifier-f7ddf0b6"}