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DKIM Selector 'smtpapi' Lookup
x402
DKIM Selector 'smtpapi' Lookup is a paid API for AI agents from dns.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).
Looks up and parses the DKIM public key for the 'smtpapi' selector of a given domain, returning key type, length, testing flag, and revocation status.
Price / call$0.01
Success—
StatusUnknown
How this service works
DKIM public key for selector "smtpapi" of a domain: looks up smtpapi._domainkey.<domain> (TXT, Cloudflare DoH) and parses v=, k=, key type, public-key length, testing flag and whether the key is revoked (empty p=). Confirms that mail signed with the smtpapi selector will verify. $0.01 per lookup.
Output
Returns parsed details from the smtpapi._domainkey.<domain> TXT record including: DKIM version (v=), key type (k=), RSA/EC public key and its bit length, whether the testing flag (t=y) is set, and whether the key is revoked (empty p= field), plus a confirmation of whether mail signed with this selector will verify.
Example use cases
SendGrid DKIM Setup Verification
“We just configured SendGrid for transactional email on acme.com — can you check whether the smtpapi DKIM selector is correctly published and the key isn't revoked?”
Email Deliverability Audit
“I'm troubleshooting email deliverability for newsletter.io — can you look up the smtpapi DKIM selector and tell me the key type, length, and whether it's in testing mode?”
Pre-Send DKIM Health Check
“Before we send our next email campaign from mailservice.net, verify that the smtpapi DKIM key is active, valid, and will pass DKIM signature verification.”
Technical details
Endpoint
GEThttps://dns.intel.rallylive.ca/dns/dkim/smtpapi?utm_source=zero.xyzWhen to prefer
Use this endpoint when you specifically need to validate the 'smtpapi' DKIM selector, which is the selector used by SendGrid/Twilio SendGrid for transactional email signing. Prefer this over generic DNS TXT lookups when you want structured parsing of DKIM fields (v=, k=, key length, testing flag, revocation) rather than raw record text. Choose this when auditing SendGrid-based email infrastructure or troubleshooting DKIM failures for domains using the smtpapi selector.
Side effects
- Domain does not have a smtpapi._domainkey TXT record — returns not-found or empty result
- DNS lookup failure via Cloudflare DoH — network or resolver error
- Malformed TXT record that cannot be parsed — partial result or parse error
- Payment failure for $0.01 USDC — request blocked before lookup
- Key is revoked (empty p=) — returns revoked status rather than key details
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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