# SiteCheck Live Page Diff (Wayback Archive Comparison)

> SiteCheck Live Page Diff (Wayback Archive Comparison) is a paid API for AI agents from api.fadeandco.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).

Compares a public web page's current content against its earliest Internet Archive (Wayback Machine) snapshot on or after a given date, returning changed status, word similarity, added/removed text lines, and extracted price amounts.

## Facts

- Endpoint: POST https://api.fadeandco.workers.dev/api/agent-intel/live-page-diff?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitecheck-live-page-diff-wayback-archive-comparison-ec131a9a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HY9BELYlZrOniezHHprhr

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 sitecheck-live-page-diff-wayback-archive-comparison-ec131a9a -d '<json body>'
```

Example prompt: Has the content on https://www.example-shop.com/pricing changed at all since 2025-01-01? Show me what was added, what was removed, and whether any prices shifted.

## When to prefer this

Choose this endpoint when you need to detect textual or pricing changes on a specific public URL by comparing its current live content against a historical Wayback Machine snapshot. It is ideal for change detection, content auditing, price monitoring, and verifying whether a page has been updated since a known date — without needing to store your own baseline snapshots. It is not suitable for pages that have never been archived, pages requiring authentication, or real-time streaming monitoring.

## Known failure modes

- 404 returned if Internet Archive has never captured the target URL
- Stale or incomplete snapshots if Wayback Machine did not crawl the page around the baseline date
- Dynamic/JavaScript-rendered pages may yield incomplete text comparisons since archive captures may be static HTML
- Very new domains or pages may have no archive history at all
- Rate limiting or network errors from the Wayback Machine may cause failures

## How this service works

Compares a public page now with its earliest Internet Archive (Wayback) snapshot on or after a date: changed yes/no, word similarity, added and removed text lines, and the price-like amounts ($, €, £) before and after. Only what the archive captured is compared; pages the archive never saved return 404.

## Output

A JSON object containing: whether the page changed (boolean), a word-level similarity score (0–1), arrays of added and removed text lines with counts, the Wayback Machine archive URL and snapshot timestamp used as the baseline, the timestamp of the live check, and arrays of price-like amounts ($ € £) found before and after. Returns 404 if the Wayback Machine has no snapshot for the given URL.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "description": "Public http(s) page address"
  },
  "since": {
   "type": "string",
   "description": "Baseline date YYYY-MM-DD (default: 30 days ago)"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "url": "https://example.org/",
  "added": [
   "This domain is for use in documentation examples without needing permission. This is not a service; avoid relying on it for testing and monitoring purposes."
  ],
  "source": "https://example.org/",
  "changed": true,
  "removed": [
   "This domain is for use in illustrative examples in documents. You may use this",
   "domain in literature without prior coordination or asking for permission."
  ],
  "baseline": {
   "archiveUrl": "https://web.archive.org/web/20251001002420id_/https://example.org/",
   "snapshotAt": "2025-10-01T00:24:20Z"
  },
  "checkedAt": "2026-10-23T09:35:18.449Z",
  "addedCount": 1,
  "similarity": 0.294,
  "pricesAfter": [],
  "pricesBefore": [],
  "removedCount": 3
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sitecheck-live-page-diff-wayback-archive-comparison-ec131a9a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.fadeandco.workers.dev](https://www.zero.xyz/host/api.fadeandco.workers.dev/llms.txt)