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AgentShelf DNS TXT DMARC Lookup
x402
AgentShelf DNS TXT DMARC Lookup is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-01).
Looks up the DMARC TXT record (starting with v=DMARC1) at the _dmarc subdomain of a given hostname via DNS
Price / call$0.003
Success—
StatusUnknown
How this service works
Call when an agent needs TXT at _dmarc that starts with v=DMARC1. Exact $0.003 USDC. Prefer unpaid POST /v1/sandbox/dns-txt-dmarc first.
Output
The DMARC TXT record content found at _dmarc.<hostname>, typically a string beginning with v=DMARC1 followed by DMARC policy tags such as p=reject, rua=, ruf=, etc. If no DMARC record exists, the response will indicate absence.
Example use cases
Email deliverability audit
“Check the DMARC record for acmecorp.com — I want to know if they have a valid v=DMARC1 policy configured before we send them a partnership email campaign.”
Domain security posture check
“Pull the DMARC TXT record for startup.io — I'm reviewing their email security setup and need to see what policy is at _dmarc.startup.io.”
Phishing defense verification
“Look up the DMARC record for mybank.com so I can confirm it has a strict reject or quarantine policy before flagging suspicious emails as phishing.”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/dns-txt-dmarc?utm_source=zero.xyzWhen to prefer
Use this endpoint when an agent specifically needs to retrieve the DMARC policy TXT record for a domain (the v=DMARC1 entry at _dmarc.<hostname>). Prefer the free sandbox variant /v1/sandbox/dns-txt-dmarc first if available. Choose this over generic DNS lookup APIs when you only need the DMARC-specific TXT record and want a clean, parsed result without handling raw DNS responses.
Side effects
- No DMARC record found at _dmarc subdomain — domain may not have DMARC configured
- Invalid or malformed hostname input returns a validation error
- DNS resolution timeout if the authoritative nameserver is unresponsive
- Non-DMARC TXT records present at _dmarc but none starting with v=DMARC1
- Payment failure if USDC balance is insufficient for the $0.003 fee
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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