# Reverse DNS via OpenDNS Change Watch

> Reverse DNS via OpenDNS Change Watch is a paid API for AI agents from ip.intel.rallylive.ca, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-11).

Monitors reverse DNS (PTR) records for an IP via OpenDNS, detects changes by comparing against the previous result (retained 90 days), and returns current value, changed flag, and field-level diffs.

## Facts

- Endpoint: GET https://ip.intel.rallylive.ca/watch/ip/ptr/via/opendns?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/reverse-dns-via-opendns-change-watch-5ebdbac2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CIEau19ICLJqQhp95hU38

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 reverse-dns-via-opendns-change-watch-5ebdbac2
```

Example prompt: Keep an eye on the reverse DNS record for 8.8.8.8 using OpenDNS and let me know if it changes — I want to see the before and after values and when it was last checked.

## When to prefer this

Choose this endpoint when you need to detect changes in reverse DNS (PTR) records for a specific IP over time, rather than just performing a one-time lookup. It is especially useful in scheduled monitoring pipelines, security alerting workflows, or infrastructure change detection where knowing when and how a PTR record changed matters. The 90-day result retention and OpenDNS resolver specificity make it well-suited for long-term drift detection.

## Known failure modes

- IP address not provided or malformed — query returns an error
- No previous result stored (first call) — 'changed' will be false or baseline-only
- OpenDNS returns no PTR record for the IP — result reflects NXDOMAIN or empty
- Payment failure via x402 — call is not executed
- Previous result has expired (older than 90 days) — treated as first call with no comparison baseline

## How this service works

Change watch for reverse dns via opendns: runs the check, compares it with the result from your previous call for the same ip (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 PTR record result for the IP, a boolean 'changed' flag comparing against the previous call for the same IP (stored up to 90 days), field-level before/after values for any changed fields, 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/reverse-dns-via-opendns-change-watch-5ebdbac2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ip.intel.rallylive.ca](https://www.zero.xyz/host/ip.intel.rallylive.ca/llms.txt)