# Tracker Detect Change Watch

> Tracker Detect Change Watch is a paid API for AI agents from intel.rallylive.ca, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Runs tracker and analytics detection on a URL and compares the result with the previous check, returning what changed, which fields changed, and when it was last seen.

## Facts

- Endpoint: GET https://intel.rallylive.ca/watch/site/trackers
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tracker-detect-change-watch-9e7523a4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_00jUxzWS8awtACsy3uiLN

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 tracker-detect-change-watch-9e7523a4
```

Example prompt: Keep an eye on https://example.com for me — check it on a schedule and let me know if the trackers or analytics scripts on the page ever change compared to the last time you checked.

## When to prefer this

Choose this endpoint when you need to detect changes in tracker and analytics scripts over time rather than just a point-in-time snapshot. It is ideal for scheduled monitoring workflows where you want to be alerted only when something actually changes, with a precise before/after diff rather than re-analyzing raw results manually. Prefer it over a one-shot tracker detector when continuity and change detection across calls is required.

## Known failure modes

- URL unreachable or returns non-200 status — may return an error or empty result
- No previous check stored for the URL (first call) — 'changed' will be false or undefined with no diff
- URL is paywalled or bot-protected — tracker detection may be incomplete
- Stale baseline if prior check is older than 90 days — history is dropped and baseline resets
- Malformed or missing URL parameter — returns validation error

## How this service works

Change watch for tracker detect: runs the check and compares it with the result from your previous call for the same url (kept 90 days), returning the current answer, changed true/false, exactly which fields changed with before/after values, and when it was last seen. Call it on a schedule to be told when tracker and analytics detection on a page changes. $0.01 per check.

## Output

Returns the current tracker/analytics detection result for the URL, a boolean indicating whether anything changed since the last check (stored up to 90 days), a detailed diff of exactly which fields changed with before and after values, and a timestamp of when the page 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/tracker-detect-change-watch-9e7523a4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from intel.rallylive.ca](https://www.zero.xyz/host/intel.rallylive.ca/llms.txt)