{"uid":"cap_pHWOsr4G_3AdHftMLf6i9","slug":"dns-txt-mx-subdomain-4e3a0652","name":"dns-txt-mx-subdomain","description":"TXT record of mx.<domain>: looks up the mx host under the domain you give (TXT via Cloudflare DoH) and reports whether it exists, its records and TTL. Quick existence check for common hosts like mx without enumerating subdomains. $0.01 per lookup.","url":"https://dns.intel.rallylive.ca/dns/host/mx/txt?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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"],"type":"string"},"queryParams":{"type":"object","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_zn-GEGPc9suaTezLUhFHn","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Looks up the TXT DNS record for the mx.<domain> subdomain via Cloudflare DoH and returns existence status, records, and TTL.","exampleAgentPrompt":"Can you check if mx.stripe.com has any TXT DNS records and tell me the TTL?","exampleUseCases":[{"title":"Email infrastructure verification","prompt":"Does mx.sendgrid.com exist as a DNS host and what TXT records does it have?"},{"title":"Domain mail setup audit","prompt":"I'm auditing acme.com — can you look up the TXT records on its mx subdomain and tell me what's there and whether it actually resolves?"},{"title":"Competitor mail configuration check","prompt":"What TXT records are published on mx.mailchimp.com, and how long is the TTL?"}],"resultDescription":"Returns whether the mx.<domain> subdomain exists, its TXT record values (e.g. SPF, verification tokens, or other TXT strings), and the TTL of those records as resolved via Cloudflare DoH.","failureModes":["Domain does not have an mx subdomain — returns non-existence result","Domain is invalid or malformed — may return an error or empty result","Cloudflare DoH is temporarily unavailable — lookup fails","Domain has no TXT records on the mx subdomain — returns empty record set","Rate limiting or payment failure — request rejected"],"whenToPreferThis":"Use this endpoint when you need a quick, cheap ($0.01) existence check and TXT record retrieval specifically for the mx subdomain of a domain, without needing to enumerate all subdomains. Prefer this over generic DNS tools when you know you're targeting the mx host specifically and want a structured JSON response.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-20T00:59:12.531Z","isFirstParty":false,"canonicalSlug":"dns-txt-mx-subdomain-4e3a0652"}