{"uid":"cap_ZaKdhbray1KIWGkpBVQc-","slug":"dns-txt-mta-sts-subdomain-5f8bd251","name":"dns-txt-mta-sts-subdomain","description":"TXT record of _mta-sts.<domain>: looks up the _mta-sts 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 _mta-sts without enumerating subdomains. $0.01 per lookup.","url":"https://dns.intel.rallylive.ca/dns/host/mta-sts/txt?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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_ud-S71wH2xBrb6BSCrorz","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 _mta-sts subdomain of a given domain via Cloudflare DoH and reports existence, record values, and TTL.","exampleAgentPrompt":"Can you check if example.com has an _mta-sts TXT record configured — I want to know if MTA-STS is set up and what the record says?","exampleUseCases":[{"title":"Email security audit for domain","prompt":"I'm auditing the email security setup for acme.com — can you check whether _mta-sts TXT record exists and tell me the record value and TTL?"},{"title":"Verify MTA-STS before mail server migration","prompt":"Before we migrate mail for startup.io, can you confirm their _mta-sts TXT record is in place and what version it's reporting?"},{"title":"Troubleshoot missing MTA-STS policy","prompt":"Our email deliverability team says MTA-STS isn't working for brandco.com — can you check if the _mta-sts TXT record actually exists in DNS and what it contains?"}],"resultDescription":"Returns whether the _mta-sts TXT record exists for the given domain, the record content (e.g. version tag like 'v=STSv1; id=...'), the TTL, and the DNS response code. If the record does not exist, the response indicates absence.","failureModes":["Domain does not have an _mta-sts TXT record — returns non-existence signal","Invalid or malformed domain input — may return an error or empty result","Cloudflare DoH upstream timeout or unavailability — lookup may fail","Payment not completed — endpoint returns 402 and does not perform lookup"],"whenToPreferThis":"Use this endpoint when you specifically need to check the _mta-sts TXT record for a single domain, particularly for email security audits, MTA-STS policy validation, or pre-deployment checks. It is faster and cheaper than a full subdomain enumeration approach and uses Cloudflare DoH for reliable, filtered DNS responses.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-20T00:59:43.197Z","isFirstParty":false,"canonicalSlug":"dns-txt-mta-sts-subdomain-5f8bd251"}