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DKIM Selector 'sm' Lookup
x402
DKIM Selector 'sm' 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 'sm' selector of a given domain via Cloudflare DoH, returning key type, length, testing flag, and revocation status.
Price / call$0.01
Success—
StatusUnknown
How this service works
DKIM public key for selector "sm" of a domain: looks up sm._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 sm selector will verify. $0.01 per lookup.
Output
Returns parsed details from the sm._domainkey.<domain> TXT record including: DKIM version (v=), key type (k=), RSA/EC public key and its bit length, whether the selector is in testing mode (t=y flag), and whether the key is revoked (empty p= field). Confirms whether mail signed with the sm selector will successfully verify.
Example use cases
Email deliverability pre-flight check
“Before we launch the campaign, check whether the sm DKIM selector on acme.com is properly configured, not revoked, and has a strong enough key length.”
Security audit of email signing setup
“I'm auditing mailchimp-style sending for brandco.io — can you pull the sm._domainkey record and tell me the key type, bit length, and if the selector is in testing mode?”
Troubleshooting DKIM verification failures
“Our transactional emails from startupxyz.com are failing DKIM checks — can you look up the sm selector and see if the public key is empty or revoked?”
Technical details
Endpoint
GEThttps://dns.intel.rallylive.ca/dns/dkim/sm?utm_source=zero.xyzWhen to prefer
Use this endpoint when you specifically need to inspect the 'sm' DKIM selector (used by some email service providers) for a domain. Prefer this over a generic DNS TXT lookup when you need structured parsing of DKIM fields (v=, k=, key length, testing flag, revocation) rather than a raw TXT string. Choose this over manual DNS tools when automating email authentication audits or deliverability checks at scale.
Side effects
- Domain does not have an sm._domainkey TXT record — returns not found or empty result
- DNS resolution failure via Cloudflare DoH — transient network error
- Malformed TXT record that cannot be parsed into DKIM fields
- Empty p= field indicating revoked/disabled key, flagged explicitly
- Rate limiting or payment failure for the $0.01 per lookup fee
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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