# DKIM Selector MJ Change Watch

> DKIM Selector MJ Change Watch is a paid API for AI agents from dns.intel.rallylive.ca, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-19).

Monitors the DKIM public key record for the 'mj' selector on a given domain and reports whether it has changed since the last check, including before/after field diffs.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/watch/dns/dkim/mj?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dkim-selector-mj-change-watch-d7c187a3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yb7jzcY_fwOxOOW7tQixh

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-change-watch-d7c187a3
```

Example prompt: Keep an eye on the DKIM 'mj' selector for rallylive.ca and let me know if it changes — tell me what fields changed and what the old and new values were.

## When to prefer this

Choose this endpoint when you need to continuously monitor whether a domain's DKIM 'mj' selector record has changed over time, rather than just fetching the current value. It is ideal for scheduled automation, security alerting, and email deliverability pipelines where detecting key rotation or unexpected changes matters. Prefer over a plain DKIM lookup endpoint when you need diff tracking and before/after change history without maintaining your own storage.

## Known failure modes

- Domain not found or has no mj._domainkey TXT record — returns current answer with no prior data on first call
- No previous check stored (older than 90 days) — 'changed' field may be indeterminate or null
- DNS resolution failure via Cloudflare DoH — upstream timeout or error
- Payment failure via x402 protocol — check not executed
- Invalid or malformed domain input — request rejected

## How this service works

Change watch for dkim selector mj: runs the check, compares it with the result from your previous call for the same domain (kept 90 days) and returns the current answer, changed true/false, the fields that changed with before/after values, and when it was last seen. Schedule it to be alerted when this changes. $0.02 per check.

## Output

Returns the current DKIM mj selector record for the domain, a boolean 'changed' flag indicating whether it differs from the previous check (stored up to 90 days), a list of changed fields with before and after values, and the timestamp of when the record was last seen.

## 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-change-watch-d7c187a3/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)