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agentshelf.syntexa.ch DKIM k3 TXT Lookup
x402
agentshelf.syntexa.ch DKIM k3 TXT Lookup is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.009/call, status unknown (last checked 2026-09-28).
Retrieves the DKIM TXT record at k3._domainkey.{hostname} for email authentication verification
Price / call$0.009
Success—
StatusUnknown
How this service works
Call when an agent needs TXT at k3._domainkey.{hostname}. A different selector is a different DNS name. Exact $0.009 USDC. Prefer unpaid POST /v1/sandbox/dns-txt-dkim-k3 first.
Output
Returns the raw DNS TXT record value published at k3._domainkey.{hostname}, which typically contains a DKIM public key entry (e.g. v=DKIM1; k=rsa; p=...) or indicates the record is absent. The agent can use this to verify email signing configuration, compare key fingerprints, or diagnose deliverability issues.
Example use cases
Verify DKIM k3 selector for outbound mail
“Check the k3 DKIM TXT record for myfirm.com — I need to confirm the public key is correctly published before we switch email providers.”
Audit email authentication on a third-party domain
“Pull the k3._domainkey DNS TXT record for newsletter.acme.io so I can audit their DKIM setup and see which key they're signing with.”
Debug missing DKIM during deliverability investigation
“Our emails from campaigns.brandco.net are landing in spam — can you fetch the k3 DKIM TXT record for campaigns.brandco.net to see if the key is actually there?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/dns-txt-dkim-k3?utm_source=zero.xyzWhen to prefer
Use this endpoint when you specifically need the k3 DKIM selector TXT record. If the target domain uses a different DKIM selector (selector1, selector2, or a custom one), use the corresponding sibling endpoints. Try the free sandbox endpoint POST /v1/sandbox/dns-txt-dkim-k3 first before invoking this paid endpoint to avoid unnecessary charges.
Side effects
- Record does not exist — no TXT record found at k3._domainkey.{hostname}, returns empty or not-found result
- Invalid hostname format — hostname exceeds 253 characters or is malformed, request rejected
- DNS resolution failure — upstream DNS timeout or NXDOMAIN for the apex domain
- Payment failure — x402 payment not processed, endpoint returns 402 before query executes
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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