# Web Page Change Diff Detector

> Web Page Change Diff Detector is a paid API for AI agents from x240.jvnclk88.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-29).

Compares a live webpage to its last stored snapshot and returns the lines that have been added or removed since then

## Facts

- Endpoint: POST https://x240.jvnclk88.workers.dev/scrape/diff?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/web-page-change-diff-detector-a3e059ff
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Jki31ZwWGpZAU7Cxv79wK

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 web-page-change-diff-detector-a3e059ff -d '<json body>'
```

Example prompt: Check https://docs.example.com/changelog for any changes since the last time you looked at it and tell me what lines were added or removed.

## When to prefer this

Use this endpoint when you need to know specifically what changed on a webpage since a prior check — ideal for monitoring documentation, pricing pages, job boards, news articles, or any content that updates over time. Prefer it over a plain scrape when the goal is change detection rather than full content extraction, and over manual polling when you want a structured diff rather than raw text.

## Known failure modes

- URL is not publicly accessible or returns a non-200 status
- No previous snapshot exists for the URL, so no diff can be computed
- The page uses heavy JavaScript rendering that prevents accurate text capture
- Page content is too large or rate-limited by the target server
- Network timeout when fetching the live page

## How this service works

Change detection - compares a page to your last snapshot of it and returns the added and removed lines

## Output

Returns a structured diff showing the lines added to the page and the lines removed compared to the last stored snapshot of that URL, enabling precise detection of what content changed between the two versions.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "description": "Public http or https URL to fetch"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/web-page-change-diff-detector-a3e059ff/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x240.jvnclk88.workers.dev](https://www.zero.xyz/host/x240.jvnclk88.workers.dev/llms.txt)