# page-preview-card-watch

> page-preview-card-watch is a paid API for AI agents from intel.rallylive.ca, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Monitors a URL's link preview card (Open Graph/meta) data for changes, returning current values, a changed flag, diff of fields, and last-seen timestamp

## Facts

- Endpoint: GET https://intel.rallylive.ca/watch/site/screenshot-meta
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/page-preview-card-watch-403f82cc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rD6FqWzKr1Dcyj-c1m-Hh

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-preview-card-watch-403f82cc
```

Example prompt: Keep an eye on https://example.com/product-launch for me — check whether its link preview card data (title, image, description) has changed since you last looked, and tell me exactly what's different.

## When to prefer this

Use this endpoint when you need to detect changes to a specific URL's link preview card (Open Graph/meta) data over time, especially in scheduled or agentic workflows where you want field-level diffs rather than just a raw snapshot. Prefer this over a plain scraper when you care about before/after comparison and change signals, not just the current value.

## Known failure modes

- URL is unreachable or returns non-200 status — error returned, no diff produced
- No previous snapshot exists (first call) — returns current data with changed: false or null baseline
- Snapshot older than 90 days purged — baseline lost, treated as first call
- Rate limit or payment failure — request rejected
- Malformed URL input — validation error returned

## How this service works

Change watch for page preview card: runs the check and compares it with the result from your previous call for the same url (kept 90 days), returning the current answer, changed true/false, exactly which fields changed with before/after values, and when it was last seen. Call it on a schedule to be told when link preview card data changes. $0.01 per check.

## Output

Returns the current page preview card data (og:title, og:description, og:image, etc.), a boolean 'changed' flag, a field-level diff showing which properties changed with before/after values, and a timestamp of when the data was last seen. Snapshots are retained for 90 days for comparison.

## 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",
     "properties": {}
    }
   },
   "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/page-preview-card-watch-403f82cc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from intel.rallylive.ca](https://www.zero.xyz/host/intel.rallylive.ca/llms.txt)