# reefjaco Web Page Fingerprint / Change Detection Watch

> reefjaco Web Page Fingerprint / Change Detection Watch is a paid API for AI agents from molecular-packs-metadata-docs.trycloudflare.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-14).

Generates a hash/snippet fingerprint of a web page at a given URL for later change detection

## Facts

- Endpoint: GET https://molecular-packs-metadata-docs.trycloudflare.com/watch
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/reefjaco-web-page-fingerprint-change-detection-watch-bcaef531
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ZLLXxybBmpd33nUqIL101

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 reefjaco-web-page-fingerprint-change-detection-watch-bcaef531
```

Example prompt: Fingerprint the page at https://example.com/pricing right now so we can detect if anything changes on it later.

## When to prefer this

Choose this endpoint when you need a lightweight, one-shot fingerprint of a web page to serve as a baseline for future change detection, rather than full content extraction or summarization. It is ideal for monitoring pipelines where you want to cheaply record page state and compare later, without storing full page content.

## Known failure modes

- Invalid or non-HTTPS URL returns an error
- URL is unreachable or returns a non-200 status
- Page content is dynamic (JS-rendered) and may not be fully captured
- Rate limiting or payment failure blocks the request
- Trycloudflare tunnel may be temporarily unavailable

## How this service works

reefjaco GET /watch One-shot hash/snippet fingerprint for later change detection

## Output

Returns a hash or fingerprint of the page content at the supplied URL, representing its state at the time of the call. This baseline can be stored and later compared against a fresh fingerprint to determine whether the page has changed.

## 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",
     "required": [
      "url"
     ],
     "properties": {
      "url": {
       "type": "string",
       "description": "HTTPS URL of the page"
      }
     }
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/reefjaco-web-page-fingerprint-change-detection-watch-bcaef531/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from molecular-packs-metadata-docs.trycloudflare.com](https://www.zero.xyz/host/molecular-packs-metadata-docs.trycloudflare.com/llms.txt)