# Structured Data Extract Change Watch

> Structured Data Extract Change 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 JSON-LD structured data and reports whether it changed since the last check, including which fields changed and their before/after values.

## Facts

- Endpoint: GET https://intel.rallylive.ca/watch/site/jsonld
- 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/structured-data-extract-change-watch-1937575c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_U-raV9f1X0gw8hM2jm2qA

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 structured-data-extract-change-watch-1937575c
```

Example prompt: Keep an eye on the JSON-LD structured data at https://example.com/product/123 and tell me if anything has changed since last time — show me exactly which fields are different and what the before and after values are.

## When to prefer this

Choose this endpoint when you need to detect changes in JSON-LD/schema.org structured data specifically, rather than general page content or HTML changes. It is ideal for scheduled monitoring workflows where you want field-level diff reporting (before/after values) rather than just a raw snapshot. Prefer it over generic web scrapers when tracking SEO-relevant structured data like product prices, availability, review ratings, or business details encoded in JSON-LD.

## Known failure modes

- URL is unreachable or returns non-200 status — check fails with an error
- No previous result stored (first call) — returns current data with no comparison baseline
- Page has no JSON-LD structured data — returns empty result
- 90-day snapshot has expired — previous result unavailable, comparison cannot be made
- Malformed JSON-LD on the target page — extraction may fail or return partial data

## How this service works

Change watch for structured data extract: 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 structured data extractor changes. $0.01 per check.

## Output

Returns the current JSON-LD structured data extracted from the URL, a boolean 'changed' flag indicating whether it differs from the previous check (stored up to 90 days), a list of exactly which fields changed with their before and after values, and a timestamp of when the data was last seen.

## 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/structured-data-extract-change-watch-1937575c/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)