# Page Change Detection – Website Change Monitoring

> Page Change Detection – Website Change Monitoring is a paid API for AI agents from scanpay-edge.alextaghiashvili.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-11-01).

Checks whether a web page's content has changed since the last check, returning a changed flag, first-seen status, and current/previous content hashes.

## Facts

- Endpoint: GET https://scanpay-edge.alextaghiashvili.workers.dev/api/v1/change-detect?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-11-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/page-change-detection-website-change-monitoring-d3a9517a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gYe37xcNM1co_KdpMwztd

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 page-change-detection-website-change-monitoring-d3a9517a
```

Example prompt: Check whether the content on https://example.com/pricing has changed since the last time you looked at it — I want to know if anything on that page is different now.

## When to prefer this

Use this endpoint when you need a lightweight, pay-per-call check of whether a specific public URL's readable content has changed since the previous check, without maintaining your own scraping infrastructure. Prefer it over full scraping solutions when you only need a boolean changed signal plus content hashes rather than the full page content. Ideal for agents that need to poll a URL periodically and react only when something is different.

## Known failure modes

- Invalid or unreachable URL returns an error response
- First check always returns first_seen: true and changed: false (no prior baseline)
- Transient network errors fetching the target page may result in failed checks
- Rate limits or payment failures return 402 or error status
- Dynamic pages with random elements (ads, timestamps) may produce false positives on changed

## How this service works

Pay-per-call x402 APIs for AI agents: OpenAI-compatible LLM chat, perp funding and arbitrage spreads, crypto prices, gas, FX, Solana SPL mint audit, token price by contract, x402 delivery-receipt verification, web search, clean page extraction, batch tools and deterministic code-security scanning. USDC on Base or Solana, no signup, no API key, from $0.0001 a call.

## Output

A JSON object containing: ok (boolean), the checked URL, total check count, a changed boolean (true if content differs from last check), first_seen boolean (true if this is the first check), current_hash (hash of current content), and previous_hash (hash of prior content).

## 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",
       "format": "uri"
      },
      "state_key": {
       "type": "string"
      },
      "previous_hash": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "url": "https://example.com/pricing",
  "checks": 4,
  "changed": true,
  "first_seen": false,
  "current_hash": "bb22…",
  "previous_hash": "aa11…"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/page-change-detection-website-change-monitoring-d3a9517a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from scanpay-edge.alextaghiashvili.workers.dev](https://www.zero.xyz/host/scanpay-edge.alextaghiashvili.workers.dev/llms.txt)