{"uid":"cap_wUChO4m8GlRDXiqkRg7mJ","slug":"dns-a-backup-subdomain-2d46c611","name":"dns-a-backup-subdomain","description":"A record of backup.<domain>: looks up the backup 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 backup without enumerating subdomains. $0.01 per lookup.","url":"https://dns.intel.rallylive.ca/dns/host/backup/a?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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_EWTW8pzKYJEsIIO-U5cJO","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 DNS A record for the 'backup' subdomain of a given domain via Cloudflare DoH and reports its existence, IP records, and TTL.","exampleAgentPrompt":"Can you check if backup.acme.com exists in DNS — I want to know if the backup subdomain is configured and what IP it resolves to.","exampleUseCases":[{"title":"Verify backup server DNS before failover","prompt":"Before we trigger the failover procedure, check whether backup.ourcompany.com actually resolves to an IP — I need to know if the backup host is properly registered in DNS."},{"title":"Audit domain infrastructure for backup host","prompt":"I'm auditing infra for clientsite.io — can you check if they have a backup subdomain configured in DNS and what address it points to?"},{"title":"Monitor backup subdomain availability","prompt":"Does backup.myapp.net currently have a valid A record? I want to confirm the backup host is still live before the maintenance window tonight."}],"resultDescription":"Returns whether the A record for backup.<domain> exists, along with any resolved IP addresses and the TTL of the record. If no record is found, indicates absence.","failureModes":["Domain does not have a backup subdomain — returns no records found","Invalid or malformed domain input — may return an error or empty result","Cloudflare DoH upstream timeout — lookup may fail with a network error","NXDOMAIN response if the subdomain definitively does not exist","Rate limiting or payment failure resulting in no response"],"whenToPreferThis":"Use this endpoint when you need a quick, targeted check on whether a specific domain has a 'backup' subdomain configured in DNS, without needing to enumerate all subdomains. Ideal for infrastructure audits, failover validation, or existence checks where you already know the host label is 'backup'.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-20T00:59:39.842Z","isFirstParty":false,"canonicalSlug":"dns-a-backup-subdomain-2d46c611"}