{"uid":"cap_ANaPFhrXOcBvx3ymzmfEo","slug":"smtp-domain-deliverability-validator-811c4951","name":"SMTP Domain Deliverability Validator","description":"Validate an email DOMAIN by performing an SMTP handshake WITHOUT sending. DO NOT use for bulk emailing. Returns MX records, greets, and a deliverability verdict. — $0.003 USDC/call on Base. Pay-per-call via x402 — no API key, no account. Free samples daily.","url":"https://defi-intel-agent-gateway.gg-neo15.workers.dev/v1/net/smtp-ping","method":"POST","headers":{},"bodySchema":null,"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","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":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_9x1oAYTYszon6b-X9z422","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Validates an email domain's deliverability by performing an SMTP handshake (without sending any email) and returning MX records, server greetings, and a deliverability verdict.","exampleAgentPrompt":"Can you check whether the domain 'acme-corp.com' can actually receive emails — without sending anything — and tell me the MX records and whether it's deliverable?","exampleUseCases":[{"title":"Pre-outreach email domain check","prompt":"Before I start my sales campaign, can you verify that 'partnerfirm.io' is a real deliverable email domain and show me its MX records?"},{"title":"CRM data quality audit","prompt":"I have a lead with the email domain 'techstartup.xyz' — can you do an SMTP ping to confirm it actually accepts mail before I add them to our CRM?"},{"title":"Bounce risk assessment before newsletter","prompt":"We're about to send a newsletter to subscribers at 'oldcompany.net' — can you check if that domain is still deliverable via SMTP handshake so we can avoid bounces?"}],"resultDescription":"Returns a JSON object containing the domain's MX records, the SMTP server greeting string(s), and a deliverability verdict indicating whether the domain is reachable and can accept mail — without any email being sent.","failureModes":["Domain has no MX records — returns empty MX list and non-deliverable verdict","SMTP server times out or refuses connection — returns connection error and unresolvable verdict","Domain does not exist in DNS — returns DNS lookup failure","Rate limit hit for free daily samples — returns 402 payment required","Malformed or missing domain input — returns validation error"],"whenToPreferThis":"Use this endpoint when you need to verify whether an email domain is reachable and deliverable before sending real emails, enriching CRM records, or cleaning contact lists — especially when you want MX record details and an SMTP-level verdict without triggering any actual mail delivery. Prefer this over simple DNS lookups when you need SMTP-layer confirmation, and over paid email validation SaaS when you want pay-per-call pricing with no account setup.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T12:31:19.875Z","isFirstParty":false}