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MTA-STS DNS TXT Record Lookup
x402
MTA-STS DNS TXT Record Lookup is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-23).
Retrieves the MTA-STS DNS TXT record (starting with v=STSv1) for a given hostname
Price / call$0.004
Success—
StatusUnknown
How this service works
Call when an agent needs TXT at _mta-sts that starts with v=STSv1. Exact $0.004 USDC. Prefer unpaid POST /v1/sandbox/dns-txt-mta-sts first.
Output
Returns the content of the _mta-sts DNS TXT record for the specified hostname, expected to begin with 'v=STSv1', indicating the domain's MTA-STS policy version and any associated policy identifiers.
Example use cases
Email security policy audit
“I need to audit our email security setup — can you fetch the MTA-STS DNS TXT record for example.com and confirm whether it has v=STSv1 configured?”
Verify competitor mail hardening
“Check whether stripe.com has an MTA-STS policy in place by looking up their _mta-sts DNS TXT record.”
Onboarding domain health check
“We're onboarding a new client at acme.org — pull their MTA-STS TXT record so I can see if their mail transport security is properly configured.”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/dns-txt-mta-sts?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically retrieve and inspect the MTA-STS DNS TXT record for a hostname, particularly to verify email transport security policy configuration. Prefer the sandbox endpoint (/v1/sandbox/dns-txt-mta-sts) for testing without incurring the $0.004 USDC cost.
Side effects
- Hostname not found or does not exist — DNS resolution failure
- No _mta-sts TXT record present for the domain — empty or null result
- Malformed hostname input exceeding 253 characters — validation error
- Domain has TXT record but not starting with v=STSv1 — returned as-is
- Network timeout when querying DNS
- Payment failure if x402 USDC payment not completed
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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