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DNS SRV Record Lookup for SMTP (agentshelf.syntexa.ch)
x402
DNS SRV Record Lookup for SMTP (agentshelf.syntexa.ch) is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.009/call, status unknown (last checked 2026-10-11).
Queries SRV DNS records at _smtp._tcp.{hostname} for a given registrable domain, returning SMTP server routing information.
Price / call$0.009
Success—
StatusUnknown
How this service works
Call when an agent needs SRV records at _smtp._tcp.{hostname} for SMTP. The caller sends the registrable domain, not the underscored name. Send JSON {"hostname":"example.com"}. Exact $0.009 USDC on Base. Try unpaid POST /v1/sandbox/dns-srv-smtp first.
Output
Returns the SRV record data found at _smtp._tcp.{hostname}, typically including target hostname, port, priority, and weight values that describe available SMTP servers for the domain.
Example use cases
Email server discovery for domain
“What SMTP servers are listed in the SRV DNS records for acmecorp.com? I need to know where to route outbound mail.”
Validate SMTP service configuration
“Check whether mailprovider.io has proper SMTP SRV records set up — I want to see the host, port, priority, and weight advertised.”
Automate mail routing for new tenant
“Before onboarding this new customer at clientdomain.net, look up their _smtp._tcp SRV records so we can configure the correct mail relay endpoint automatically.”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/dns-srv-smtp?utm_source=zero.xyzWhen to prefer
Use this endpoint when an agent specifically needs to discover SMTP server configuration via DNS SRV records for a given domain, such as for automated email routing, SMTP client configuration, or validating that a domain has published SMTP service records. Prefer the free sandbox endpoint (/v1/sandbox/dns-srv-smtp) for testing before using this paid endpoint.
Side effects
- Domain does not exist — DNS NXDOMAIN response
- No SRV records configured at _smtp._tcp.{hostname} — empty result
- Invalid or malformed hostname input — validation error
- Network timeout or DNS resolver failure
- Hostname exceeds 253-character limit — schema validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| hostname | string | Public DNS hostname such as example.com. Not a URL, not an IP literal, and not a private name. |
Tags
x402
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