{"uid":"cap_txLPE3KyCkhJhXe57RM8W","slug":"dns-txt-record-lookup-for-acme-challenge-subdomain-debec59a","name":"DNS TXT Record Lookup for _acme-challenge Subdomain","description":"TXT record of _acme-challenge.<domain>: looks up the _acme-challenge 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 _acme-challenge without enumerating subdomains. $0.01 per lookup.","url":"https://dns.intel.rallylive.ca/dns/host/acme-challenge/txt?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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_6-Z1n0D7Z6ktTHkbbqVwH","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 _acme-challenge subdomain of a given domain via Cloudflare DoH and reports existence, records, and TTL","exampleAgentPrompt":"Can you check if _acme-challenge.example.com has a TXT record set — I need to know if the DNS-01 ACME challenge record is there and what its value and TTL are?","exampleUseCases":[{"title":"Verify Let's Encrypt DNS challenge record","prompt":"Before I trigger certificate issuance, can you check whether the _acme-challenge TXT record is already present and what it says for mydomain.com?"},{"title":"Debug failed ACME DNS-01 validation","prompt":"My Let's Encrypt cert renewal failed — can you check if the _acme-challenge TXT record for acmecorp.io actually exists and what TTL it has?"},{"title":"Automate pre-cert-issuance DNS readiness check","prompt":"I'm about to issue a wildcard certificate for startupsite.dev — can you confirm the _acme-challenge subdomain has a TXT record set and report back the value?"}],"resultDescription":"Returns whether the _acme-challenge TXT record exists under the given domain, the full TXT record value(s) if present, and the TTL of the record, as resolved via Cloudflare DNS over HTTPS.","failureModes":["Record does not exist — returns existence flag as false with no record data","Domain not found or invalid — may return DNS NXDOMAIN or empty response","Cloudflare DoH service unavailable — upstream timeout or error","Malformed domain input — request may fail or return unexpected results","TTL of 0 or very low — record may have just been set and not yet propagated globally"],"whenToPreferThis":"Use this endpoint when you need a quick, targeted existence check for the _acme-challenge TXT record specifically — ideal for pre-flight checks before ACME DNS-01 certificate issuance or renewal, or for monitoring whether a challenge record has been set. Prefer this over full subdomain enumeration tools when you only need to confirm the presence of this single well-known host.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-20T00:59:36.761Z","isFirstParty":false,"canonicalSlug":"dns-txt-record-lookup-for-acme-challenge-subdomain-debec59a"}