# DKIM Selector 'mj' Lookup

> DKIM Selector 'mj' 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 'mj' selector of a given domain via Cloudflare DNS-over-HTTPS, returning key type, length, testing flag, and revocation status.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/dkim/mj?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dkim-selector-mj-lookup-47a6c297
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VCNzdVD8nopIkztC4e0Yg

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability dkim-selector-mj-lookup-47a6c297
```

Example prompt: Can you check the DKIM configuration for the 'mj' selector on mailjet.com — I want to know if the key is valid, what type and length it is, and whether it's revoked or in testing mode?

## When to prefer this

Use this endpoint when you specifically need to inspect the DKIM configuration for the 'mj' selector (commonly used by Mailjet) on a domain. Prefer this over generic DNS TXT lookup endpoints when you want pre-parsed DKIM fields (key type, length, revocation status, testing flag) without having to parse the raw TXT record yourself. Choose sibling selectors (yahoo, protonmail2, zendesk2) if checking those respective providers instead.

## Known failure modes

- Domain has no mj._domainkey TXT record — returns not found or empty result
- DNS resolution failure via Cloudflare DoH — network or upstream error
- Malformed TXT record that cannot be parsed into DKIM fields
- Domain does not exist — NXDOMAIN response
- Payment not provided — 402 Payment Required response blocking the lookup

## How this service works

DKIM public key for selector "mj" of a domain: looks up mj._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 mj selector will verify. $0.01 per lookup.

## Output

Returns parsed fields from the mj._domainkey.<domain> TXT record including the DKIM version tag (v=), key type (k=), public key algorithm, public key 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 the mj selector will successfully verify.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/dkim-selector-mj-lookup-47a6c297/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from dns.intel.rallylive.ca](https://www.zero.xyz/host/dns.intel.rallylive.ca/llms.txt)