# DKIM Selector fm2 Change Watch

> DKIM Selector fm2 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 2026-10-20).

Monitors the DKIM public key for the 'fm2' selector of a domain and returns whether it has changed since the last check, with before/after field diffs.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/watch/dns/dkim/fm2?utm_source=zero.xyz
- Price: $0.02/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-fm2-change-watch-60bda8cf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OtjDZapi4IziB3JwZIo-3

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-fm2-change-watch-60bda8cf
```

Example prompt: Keep an eye on the fm2 DKIM selector for example.com and let me know if it changes — I want to be alerted whenever the record is different from the last time you checked.

## When to prefer this

Use this endpoint when you need to detect changes to the fm2 DKIM selector specifically (e.g. for domains using Freshmail or similar senders that use the fm2 selector), and you want diff-aware change detection with historical comparison rather than a raw one-time DNS lookup. Ideal for scheduling periodic polling to trigger alerts on key rotation.

## Known failure modes

- Domain does not exist or has no fm2 DKIM record — returns current empty/null result with changed flag based on prior state
- No previous check stored (first call) — returns current value with changed=false and no diff
- DNS resolution failure via Cloudflare DoH — may return error or timeout
- Domain parameter missing or malformed — request error

## How this service works

Change watch for dkim selector fm2: 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 fm2 selector record value, a boolean 'changed' flag indicating whether it differs from the previous check (stored up to 90 days), a list of fields that changed with their 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-fm2-change-watch-60bda8cf/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)