{"uid":"cap_UH2e03h-xbBn30jksZuV8","slug":"srv-submission-tcp-service-discovery-9fc1481d","name":"SRV Submission TCP Service Discovery","description":"SUBMISSION service discovery (_submission._tcp.<domain>): SRV records with priority, weight, port and target host, from Cloudflare DoH. Tells a client where the domain's submission service lives without guessing hosts. $0.01 per lookup.","url":"https://dns.intel.rallylive.ca/dns/srv/submission-tcp?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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_y8sa4W07zbSy29sBdWUhy","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 SRV DNS records for the SMTP submission service (_submission._tcp) of a domain via Cloudflare DoH, returning priority, weight, port, and target host.","exampleAgentPrompt":"Can you look up the _submission._tcp SRV DNS record for gmail.com and tell me the priority, weight, port, and target host for its email submission service?","exampleUseCases":[{"title":"Email client auto-configuration","prompt":"I'm building an email client and need to auto-discover where gmail.com's SMTP submission server lives — can you look up the _submission._tcp SRV record for gmail.com and give me the host and port?"},{"title":"Validating mail infrastructure setup","prompt":"We just set up our mail infrastructure for acme.com — can you check the _submission._tcp SRV DNS record to confirm our submission service is pointing to the right host and port?"},{"title":"Diagnosing email delivery issues","prompt":"Users are having trouble submitting emails through fastmail.com — can you pull the _submission._tcp SRV record for fastmail.com so I can see what host and port the service is supposed to be on?"}],"resultDescription":"Returns the SRV record set for _submission._tcp.<domain> including one or more records each with priority, weight, port number, and target hostname, sourced via Cloudflare DoH. If no SRV records exist, returns an empty or negative response.","failureModes":["Domain has no _submission._tcp SRV record — returns empty result or NXDOMAIN","Invalid or malformed domain name input — may return error or empty response","Cloudflare DoH upstream timeout or unavailability — returns error","Non-existent domain queried — NXDOMAIN response","Network connectivity issues to dns.intel.rallylive.ca — connection failure"],"whenToPreferThis":"Use this endpoint when you need to programmatically discover the SMTP submission service endpoint (host, port, priority, weight) for a given domain via standard SRV DNS records, particularly for email client auto-configuration or mail infrastructure validation. Prefer this over manual host guessing or MX record lookups when the domain is expected to publish a _submission._tcp SRV record. Use it over generic DNS resolvers when you want a clean, paid, per-lookup API with Cloudflare DoH reliability.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-20T00:59:11.234Z","isFirstParty":false,"canonicalSlug":"srv-submission-tcp-service-discovery-9fc1481d"}