{"uid":"cap__ORt_z5evrfNENn8kZvC7","slug":"dns-a-auth-subdomain-3bbcc20f","name":"dns-a-auth-subdomain","description":"A record of auth.<domain>: looks up the auth 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 auth without enumerating subdomains. $0.01 per lookup.","url":"https://dns.intel.rallylive.ca/dns/host/auth/a?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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_keK31OAEhrG-qmxDhChVt","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 auth.<domain> via Cloudflare DNS over HTTPS and reports whether the auth subdomain exists, its IP records, and TTL.","exampleAgentPrompt":"Does example.com have an auth subdomain set up? Look up its DNS A record and tell me the IP address and TTL if it exists.","exampleUseCases":[{"title":"Pre-integration auth host check","prompt":"Before I integrate with acme.com's login system, can you check whether they have an auth subdomain configured — I need to know the IP it resolves to and whether it's live."},{"title":"Security audit for customer domain","prompt":"I'm auditing the domain startup.io — does it have an auth subdomain, and if so what IP address does it point to? I want to know if they've isolated their authentication infrastructure."},{"title":"Competitor infrastructure reconnaissance","prompt":"Can you check if competitor.com has a dedicated auth host set up? Look up the DNS A record for their auth subdomain and tell me what you find."}],"resultDescription":"Returns whether the auth.<domain> subdomain exists as a DNS A record, the resolved IP address(es), the TTL in seconds, and metadata about the lookup via Cloudflare DoH.","failureModes":["Domain does not exist — NXDOMAIN returned, no records found","auth subdomain not configured — lookup returns no A records","Invalid or malformed domain input — API may return error or empty result","Cloudflare DoH upstream timeout — transient failure","Rate limiting or payment failure for the $0.01 USDC per-call fee"],"whenToPreferThis":"Use this endpoint when you need a quick, single-host existence check for the auth subdomain of a specific domain without enumerating all subdomains. Prefer this over generic DNS resolvers when you want a structured, agent-friendly response and are specifically interested in whether a domain has isolated its authentication on a dedicated auth host.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-20T18:39:59.993Z","isFirstParty":false,"canonicalSlug":"dns-a-auth-subdomain-3bbcc20f"}