{"uid":"cap_llRJ7CCcCWX57WOsm12W_","slug":"dns-a-mx1-subdomain-86a53fd0","name":"dns-a-mx1-subdomain","description":"A record of mx1.<domain>: looks up the mx1 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 mx1 without enumerating subdomains. $0.01 per lookup.","url":"https://dns.intel.rallylive.ca/dns/host/mx1/a?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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_6X7egZsedmItQ4kSYdhP6","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 (IPv4 address) for the mx1 subdomain of a given domain using Cloudflare DNS over HTTPS, reporting existence, records, and TTL.","exampleAgentPrompt":"Can you check if mx1.acmecorp.com exists and what IPv4 address it resolves to? I want to know the A record and TTL for the mx1 host under acmecorp.com.","exampleUseCases":[{"title":"Verify email server host presence","prompt":"Does mx1.sendgrid.net actually exist as a host? Can you look up its A record and tell me what IP it resolves to and the TTL?"},{"title":"Pre-flight mail infrastructure audit","prompt":"I'm auditing the mail setup for startup.io — can you check whether mx1.startup.io has an A record configured, and if so what IP and TTL it has?"},{"title":"Detect MX1 host misconfiguration","prompt":"We're troubleshooting email delivery issues for clientdomain.com — can you check if mx1.clientdomain.com resolves to an IP via its A record or if the host is missing?"}],"resultDescription":"Returns whether the mx1 subdomain of the given domain has an A record, including the resolved IPv4 address(es) and the TTL value, or indicates that no record exists.","failureModes":["Domain does not have an mx1 subdomain — returns a non-existence result or empty record set","Invalid or malformed domain name input — may return an error or empty response","DNS resolution failure or Cloudflare DoH outage — lookup may time out or return an error","Domain uses CNAME at mx1 rather than an A record — A record query returns no direct result"],"whenToPreferThis":"Use this endpoint when you need a fast, targeted existence and IP resolution check specifically for the mx1 host of a domain, without broader DNS enumeration. Prefer it over general DNS tools when you want a cheap ($0.01), single-purpose A-record lookup for the common mx1 mail host pattern via Cloudflare DoH.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-20T00:59:37.285Z","isFirstParty":false,"canonicalSlug":"dns-a-mx1-subdomain-86a53fd0"}