# Webpage Snippet Change Watcher

> Webpage Snippet Change Watcher 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 a change-detection check on a webpage snippet URL and returns whether it changed since the last call, with before/after diffs and timestamps

## Facts

- Endpoint: GET https://intel.rallylive.ca/watch/page-snippet
- 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/webpage-snippet-change-watcher-3c656d76
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0nGKzYqrTWRmVlieU0Jsz

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 webpage-snippet-change-watcher-3c656d76
```

Example prompt: Keep an eye on https://example.com/pricing for me — call this every hour and let me know as soon as the content changes, showing me exactly what was different before and after.

## When to prefer this

Use this endpoint when you need lightweight, scheduled change detection on a specific webpage snippet without scraping the entire page. It is ideal for polling tasks where you want a stateful before/after comparison automatically managed server-side (90-day history), avoiding the need to store previous snapshots yourself. Prefer it over full-page scrapers when you only care about whether a targeted section changed, not a full content extraction.

## Known failure modes

- URL is unreachable or returns a non-200 status
- No previous result exists for this URL (first call returns changed=false or null baseline)
- Snippet selector yields no content on the page
- Rate limiting or payment failure prevents the check
- Page content is behind authentication or anti-bot measures
- Result older than 90 days has been purged, resetting the baseline

## How this service works

Change watch for webpage snippet: 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 lightweight web page snippet changes. $0.01 per check.

## Output

Returns the current content of the webpage snippet, a boolean 'changed' flag indicating whether it differs from the previous call, a list of fields that changed with their before and after values, and a timestamp of when the snippet was last seen. Previous results are stored for 90 days per URL.

## 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/webpage-snippet-change-watcher-3c656d76/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)