# price-extract-watch

> price-extract-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 price data extracted from a webpage and reports whether it has changed since the last check, including before/after field diffs.

## Facts

- Endpoint: GET https://intel.rallylive.ca/watch/site/prices
- 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/price-extract-watch-bc20bc03
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rbU3nwrKOUFxrn-uEZAdu

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 price-extract-watch-bc20bc03
```

Example prompt: Keep an eye on the pricing page at https://example.com/product/widget and let me know if any prices change compared to last time you checked — show me exactly which fields changed and what the old and new values are.

## When to prefer this

Choose this endpoint when you need to detect changes in price data specifically extracted from a webpage, as opposed to monitoring general page content or non-price fields. It is ideal for scheduled agent workflows where you want structured diff output (changed fields with before/after values) rather than a raw snapshot. Prefer it over generic change-watch tools when the target page contains pricing information you want to track with minimal per-check cost ($0.01/check).

## Known failure modes

- URL is inaccessible or returns a non-200 status — extraction fails with an error
- No previous result exists for the URL — first call returns current data with changed=false or null diff
- Page has anti-scraping measures that block price extraction
- Price data is rendered client-side via JavaScript and cannot be statically extracted
- Stored comparison result has expired after 90 days, losing diff baseline

## How this service works

Change watch for price 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 price extraction from a page changes. $0.01 per check.

## Output

Returns the current price extraction result from the page, a boolean 'changed' flag indicating whether any price data differs from the previous call for the same URL, a list of exactly which fields changed with their before and after values, and a timestamp of when the data was last seen. Results are retained for 90 days per URL.

## 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/price-extract-watch-bc20bc03/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)