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DKIM MX Selector Lookup
x402
DKIM MX Selector 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 'mx' 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 "mx" of a domain: looks up mx._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 mx selector will verify. $0.01 per lookup.
Output
Returns parsed DKIM record fields for the mx selector including: version (v=DKIM1), key type (k=rsa or ed25519), public key length in bits, whether the testing flag (t=y) is set, and whether the key is revoked (empty p= value). Also confirms whether mail signed with the mx selector will successfully verify.
Example use cases
Pre-send email deliverability check
“Before we start sending bulk mail through our mx servers, check whether the DKIM mx selector is valid and not revoked for acmecorp.com.”
Debugging email signature failures
“We're getting DKIM verification failures for mail signed with the mx selector from newsletter.io — can you look up the mx._domainkey TXT record and tell me if the key is revoked or in testing mode?”
Security audit of domain email config
“I'm auditing email security for clientdomain.net — please check the DKIM mx selector and tell me the key type, key length, and whether the key has been revoked.”
Technical details
Endpoint
GEThttps://dns.intel.rallylive.ca/dns/dkim/mx?utm_source=zero.xyzWhen to prefer
Use this endpoint when you specifically need to verify the 'mx' DKIM selector for a domain — as opposed to other common selectors like 'mailgun', 'google', or 'default'. It is ideal for diagnosing email deliverability issues, auditing email security posture, or confirming that DKIM signing via the mx selector is active and not revoked before initiating mail flows.
Side effects
- Domain has no mx._domainkey TXT record — returns not found or empty result
- DNS query fails due to Cloudflare DoH outage or connectivity issue
- Domain does not exist or is mistyped — DNS NXDOMAIN response
- Key is revoked (empty p=) — endpoint reports revocation rather than failing
- Malformed TXT record that cannot be parsed — partial result or parse error
- Payment not provided or insufficient — 402 Payment Required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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