# DKIM Default Selector Change Watch

> DKIM Default Selector 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 TXT record for the 'default' selector of a domain and alerts when it changes, comparing against the last result stored for up to 90 days.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/watch/dns/dkim/default?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-default-selector-change-watch-edf39816
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_up4Nvn4FyPurpK3qjF0U5

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-default-selector-change-watch-edf39816
```

Example prompt: Keep an eye on the DKIM default selector record for example.com and let me know as soon as it changes — I want to catch any unauthorized key rotations right away.

## When to prefer this

Choose this endpoint when you need to continuously monitor whether the DKIM 'default' selector of a specific domain has changed over time, particularly for security auditing, compliance tracking, or alerting on unauthorized key rotations. It is purpose-built for change detection with 90-day memory, making it superior to a plain DKIM lookup when historical comparison and diff output are needed.

## Known failure modes

- Domain has no default._domainkey TXT record — returns empty or no-record response
- Domain not previously checked — no baseline to compare against, so 'changed' may be indeterminate on first call
- Network or DoH resolver timeout — may return an error instead of DNS data
- Payment failure via x402 — request rejected before check is performed
- Domain input missing or malformed — request fails validation

## How this service works

Change watch for dkim selector default: 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 TXT record for the 'default' selector, a boolean 'changed' flag indicating whether it differs from the last recorded check (within 90 days), a diff of fields that changed with before/after values, and a 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-default-selector-change-watch-edf39816/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)