# Page-Change Monitor (30-Day Watch)

> Page-Change Monitor (30-Day Watch) is a paid API for AI agents from predator-ubuntu.taild9a745.ts.net, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-18).

Registers a URL for scheduled polling over 30 days and lets the caller poll back for detected page changes

## Facts

- Endpoint: POST https://predator-ubuntu.taild9a745.ts.net/v1/watch?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/page-change-monitor-30-day-watch-f505ad05
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_O6y5LA2fsOHeMMxwadGFV

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-monitor-30-day-watch-f505ad05 -d '<json body>'
```

Example prompt: Keep an eye on https://example.com/pricing for me — check it every 60 minutes and let me know when anything changes.

## When to prefer this

Choose this endpoint when you need passive, recurring surveillance of a specific URL over days or weeks without running your own cron job or scraping infrastructure. It is ideal for low-frequency change detection (every 5 minutes to daily) where you can tolerate polling the service for results rather than receiving a push webhook. Prefer alternatives if you need real-time sub-minute alerts, webhook push notifications, or monitoring of pages requiring authentication.

## Known failure modes

- Invalid or unreachable URL returns an error with no watch created
- interval_minutes below 5 or above 1440 rejected with validation error
- Payment not received results in 402 response and no registration
- Target URL blocks the polling bot (403/robots.txt) causing silent missed checks
- 30-day window expires and no further changes are reported after expiry

## How this service works

Page-change monitoring for 30 days: we poll a URL on schedule, you poll us for changes

## Output

Returns a watch registration confirming the URL is now being polled at the requested interval; subsequent polls to this service return any detected page changes (diffs or change flags) captured during the 30-day monitoring window.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "format": "uri"
  },
  "interval_minutes": {
   "type": "integer",
   "maximum": 1440,
   "minimum": 5
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/page-change-monitor-30-day-watch-f505ad05/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from predator-ubuntu.taild9a745.ts.net](https://www.zero.xyz/host/predator-ubuntu.taild9a745.ts.net/llms.txt)