# AgentProof Detect Page Change

> AgentProof Detect Page Change is a paid API for AI agents from agentproof.hatchable.site, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-11).

Monitors a web page for content changes and returns a cryptographically signed provenance receipt with integrity hash as machine-verifiable evidence

## Facts

- Endpoint: POST https://agentproof.hatchable.site/api/paid/detect_page_change?utm_source=zero.xyz
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentproof-detect-page-change-8300bde1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EtUZiOCBQr8CkDY4qzYMv

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 agentproof-detect-page-change-8300bde1 -d '<json body>'
```

Example prompt: Check whether https://example.com/terms-of-service has changed since my last snapshot and give me a cryptographic receipt proving the current state, including its SHA-256 integrity hash.

## When to prefer this

Choose this endpoint when an autonomous agent needs cryptographically verifiable, receipted proof that a web page has or has not changed — especially in compliance, audit, legal, or trust-sensitive workflows where a simple diff is insufficient and a signed provenance record is required. It is preferable over generic web scraping or diffing tools when the output must serve as machine-paid evidence in an autonomous transaction context.

## Known failure modes

- URL unreachable or returns non-200 status — ok:false with error detail
- Invalid or malformed URL input — request rejected before fetch
- Page content too large to hash within limits — may timeout or error
- Payment not processed — x402 payment required before response
- Transient network error fetching target page — retry recommended

## How this service works

AgentProof publishes Agent Transaction Passport™ and provides machine-paid evidence, provenance receipts, source comparison and change monitoring for autonomous transactions.

## Output

Returns a JSON object with an 'ok' boolean, the tool name 'detect_page_change', a receipt object containing a UUID and a SHA-256 integrity hash of the page content, and the service name 'AgentProof'. This receipt acts as machine-verifiable proof of the page's state at the time of the call.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "format": "uri"
  },
  "claim": {
   "type": "string"
  },
  "email": {
   "type": "string"
  },
  "phone": {
   "type": "string"
  },
  "contactName": {
   "type": "string"
  },
  "previousSha256": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "tool": "detect_page_change",
  "receipt": {
   "id": "uuid",
   "integrity_sha256": "..."
  },
  "service": "AgentProof"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentproof-detect-page-change-8300bde1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentproof.hatchable.site](https://www.zero.xyz/host/agentproof.hatchable.site/llms.txt)