# PagePulse URL Change Check

> PagePulse URL Change Check is a paid API for AI agents from x402.167-179-80-192.sslip.io, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Checks whether a given HTTPS URL has changed since a previous visit by comparing its content hash

## Facts

- Endpoint: POST https://x402.167-179-80-192.sslip.io/v1/pagepulse/url-change-check
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pagepulse-url-change-check-cefc6e18
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UvTG83KBKWSFkmAi0lqJx

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 pagepulse-url-change-check-cefc6e18 -d '<json body>'
```

Example prompt: Check if https://example.com/announcements has changed since my last visit — the previous hash I have is abc123def456.

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call mechanism to detect whether a specific HTTPS URL's content has changed since a known previous state. It is ideal for polling workflows where you have a stored hash from a prior fetch and want to avoid re-downloading and comparing full page content yourself. Prefer it over general-purpose web scrapers when all you need is a boolean change signal plus a refreshed hash.

## Known failure modes

- URL does not start with https:// — request rejected due to schema pattern validation
- URL is unreachable or returns a non-200 status — change detection cannot complete
- Previous hash format is invalid — comparison may fail or be skipped
- Rate limiting or payment failure (x402) — call is not processed
- Timeout fetching the remote URL — no result returned

## How this service works

x402-native discovery surface for seven existing products.

## Output

Returns a JSON object indicating whether the page content has changed since the previous hash was recorded, along with the current content hash of the page for future comparisons.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "format": "uri",
   "pattern": "^https://"
  },
  "previous_hash": {
   "type": [
    "string",
    "null"
   ]
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {}
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pagepulse-url-change-check-cefc6e18/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.167-179-80-192.sslip.io](https://www.zero.xyz/host/x402.167-179-80-192.sslip.io/llms.txt)