# FetchDelta Page Watch 30-Day

> FetchDelta Page Watch 30-Day is a paid API for AI agents from fetchdelta.com, paid per call via x402, $0.5/call, status unknown (last checked 2026-09-14).

Creates a prepaid 30-day daily watch on up to five public URLs, notifying when page content changes, with payment via Base USDC over x402.

## Facts

- Endpoint: GET https://fetchdelta.com/api/page-watch-30d
- Price: $0.5/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fetchdelta-page-watch-30-day-6fb1c197
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vHqxZQIqbb06eU9XOGjpE

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 fetchdelta-page-watch-30-day-6fb1c197
```

Example prompt: Set up a 30-day daily watch on https://stripe.com/docs/changelog so I get alerted whenever that page changes — pay for it with USDC.

## When to prefer this

Choose this endpoint when you need prepaid, scheduled daily monitoring of up to five public pages over a 30-day window and want to pay per result in USDC via x402 without managing recurring billing. Prefer it over one-shot fetch or diff endpoints when you need persistent, autonomous change detection rather than a single snapshot or comparison. It is ideal for agents that must surface breaking changes in docs, changelogs, pricing, or policy pages without polling themselves.

## Known failure modes

- Invalid or non-public URL (localhost, credentialed, or non-HTTP(S) URLs rejected)
- More than five URLs supplied in a single request
- Payment failure or insufficient USDC balance over x402
- URL is inaccessible or returns non-200 at initial check (reflected in failedUrls count)
- Malformed request missing required 'url' query parameter

## How this service works

Public page data and prepaid daily watches for AI agents. Pay per result with Base USDC over x402.

## Output

Returns a watch object with a unique watch ID, a status URL to poll for future change reports, a one-time Bearer access token for subsequent status requests, the 30-day cadence details, and an initial check summary showing how many of the submitted URLs were successfully checked, changed, or failed.

## 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",
       "description": "Absolute URL of a public HTTP(S) page to fetch. Use docs, changelogs, release notes, pricing pages, policy pages, or other public pages. Private, localhost, credentialed, and non-HTTP(S) URLs are rejected. Repeat the url query parameter to watch up to five pages."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "watch": {
   "id": "00000000-0000-4000-8000-000000000000",
   "cadence": "daily",
   "statusUrl": "https://fetchdelta.com/api/page-watch-30d/00000000-0000-4000-8000-000000000000",
   "durationDays": 30
  },
  "access": {
   "token": "returned-once-after-payment",
   "scheme": "Bearer"
  },
  "product": "page-watch-30d",
  "initialCheck": {
   "failedUrls": 0,
   "changedUrls": 0,
   "checkedUrls": 1
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fetchdelta-page-watch-30-day-6fb1c197/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from fetchdelta.com](https://www.zero.xyz/host/fetchdelta.com/llms.txt)