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AgentShelf DNS TXT SPF Lookup
x402
AgentShelf DNS TXT SPF Lookup is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-02).
Fetches the SPF TXT record (v=spf1...) from the DNS of a given hostname
Price / call$0.002
Success—
StatusUnknown
How this service works
Call when an agent needs apex TXT records that start with v=spf1. Fails when no SPF record exists. Exact $0.002 USDC. Prefer unpaid POST /v1/sandbox/dns-txt-spf first.
Output
Returns the apex DNS TXT record for the given hostname that begins with 'v=spf1', representing the domain's Sender Policy Framework policy string. Fails with an error if no SPF record exists for the hostname.
Example use cases
Email deliverability audit for a domain
“Check the SPF DNS record for sendgrid.net — I want to see the full v=spf1 policy they have published.”
Verifying a client domain's email setup
“Pull the SPF TXT record for acme-corp.com so I can confirm their domain is properly configured to authorize their ESP.”
Security review of third-party sender
“What's the SPF record for mailchimp.com? I want to see which IP ranges and mechanisms it includes.”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/dns-txt-spf?utm_source=zero.xyzWhen to prefer
Use this endpoint when you specifically need to retrieve the SPF TXT record (v=spf1) for a domain and want a simple, dedicated lookup without building DNS resolution infrastructure. Prefer the free sandbox endpoint (/v1/sandbox/dns-txt-spf) first if available; fall back to this paid endpoint when the sandbox is unavailable or rate-limited. Good fit for email deliverability checks, domain security audits, and mail server authorization verification.
Side effects
- No SPF record found for the hostname — endpoint returns an error or empty result
- Hostname does not exist or is unreachable via DNS
- Malformed hostname input exceeding 253 characters
- Network timeout during DNS resolution
- Multiple SPF records present (technically invalid per RFC) — behavior may be undefined
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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