{"uid":"cap_6G7wKnIn9JN-RC1deSENu","slug":"dns-a-record-lookup-for-mx-subdomain-a4795cf1","name":"DNS A Record Lookup for MX Subdomain","description":"A record of mx.<domain>: looks up the mx host under the domain you give (A via Cloudflare DoH) and reports whether it exists, its records and TTL. Quick existence check for common hosts like mx without enumerating subdomains. $0.01 per lookup.","url":"https://dns.intel.rallylive.ca/dns/host/mx/a?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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_Qv8r__Ta_7KiXhWa-feZj","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 A record for the mx.<domain> host via Cloudflare DoH and reports whether it exists, its IP records, and TTL","exampleAgentPrompt":"Check if mx.acmecorp.com exists as a DNS A record — I want to know its IP addresses and TTL.","exampleUseCases":[{"title":"Email server infrastructure validation","prompt":"Does mx.example.com actually resolve to an IP? I want to confirm the MX host has a proper A record before I configure our mail server to relay through it."},{"title":"Pre-send domain deliverability check","prompt":"Before we send out this email campaign, can you verify that mx.ourdomain.com has a valid A record and tell me its current TTL?"},{"title":"Competitor email infrastructure recon","prompt":"I'm doing a quick recon on competitor.com — can you check if their mx subdomain resolves and what IP it points to?"}],"resultDescription":"Returns whether the mx.<domain> A record exists, the resolved IP address(es), and the TTL of the record. If the host does not exist, indicates non-existence.","failureModes":["Domain does not exist — NXDOMAIN returned, existence flag is false","MX subdomain has no A record — host exists but no address record","Malformed domain input — query fails with validation error","Cloudflare DoH upstream timeout — transient failure","Rate limiting or payment failure — 402 response if payment not attached"],"whenToPreferThis":"Use this endpoint when you need a fast, cheap ($0.01) existence and IP check specifically for the mx.<domain> host without enumerating all subdomains. Prefer it over generic DNS APIs when you want Cloudflare DoH-backed resolution with a simple REST interface and per-call micropayment pricing for lightweight spot-checks.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-20T00:59:16.688Z","isFirstParty":false,"canonicalSlug":"dns-a-record-lookup-for-mx-subdomain-a4795cf1"}