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SRV Submission TCP Service Discovery
x402
SRV Submission TCP Service Discovery is a paid API for AI agents from dns.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).
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.
Price / call$0.01
Success—
StatusUnknown
How this service works
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.
Output
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.
Example use cases
Email client auto-configuration
“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?”
Validating mail infrastructure setup
“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?”
Diagnosing email delivery issues
“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?”
Technical details
Endpoint
GEThttps://dns.intel.rallylive.ca/dns/srv/submission-tcp?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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