# AgentRXI Web Page Change Watcher

> AgentRXI Web Page Change Watcher is a paid API for AI agents from agentrxi.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-15).

Monitors a URL for content changes by comparing the current page against a stored snapshot, returning lines added and removed since the last check.

## Facts

- Endpoint: GET https://agentrxi.com/v1/watch?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentrxi-web-page-change-watcher-5729224d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_59pV45ACCyBrqx1xEVKGV

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 agentrxi-web-page-change-watcher-5729224d
```

Example prompt: Check https://example.com/pricing for any changes since the last time you looked — tell me exactly which lines were added and which were removed.

## When to prefer this

Choose this endpoint when you need to track what specifically changed on a web page between two points in time, not just whether it changed. Ideal for monitoring competitor pages, documentation, regulatory filings, job boards, or any URL where the delta (added/removed lines) matters. Prefer this over generic scraping endpoints when change detection and diff output are the primary goal.

## Known failure modes

- URL is unreachable or returns non-200 status — no snapshot saved or updated
- First call returns no diff (snapshot creation only, no comparison yet)
- Page content is dynamic/JavaScript-rendered and the snapshot may not reflect true visible content
- Invalid or missing URL parameter causes request failure
- Rate limiting or payment failure (x402) prevents snapshot update

## How this service works

Page change watch: reports what changed on a web page since your last check (lines added and removed). The first call saves a snapshot; each later call compares and updates it. Snapshots are private to the paying wallet.

## Output

Returns a diff of the target web page against its stored snapshot: lines that were added since the last call and lines that were removed. On the very first call for a given URL, the snapshot is saved and no diff is returned. Subsequent calls update the snapshot and return the delta. Snapshots are isolated per paying wallet.

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentrxi-web-page-change-watcher-5729224d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentrxi.com](https://www.zero.xyz/host/agentrxi.com/llms.txt)