# Extract Footer as JSON – Change Watch

> Extract Footer as JSON – Change Watch is a paid API for AI agents from page.intel.rallylive.ca, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-20).

Monitors a web page's footer content (as JSON) and returns whether it has changed since the last check, along with before/after field diffs.

## Facts

- Endpoint: GET https://page.intel.rallylive.ca/watch/page/footer/json?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/extract-footer-as-json-change-watch-4f65b12b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Osh1ZE-doKmKP5KdtqaN6

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 extract-footer-as-json-change-watch-4f65b12b
```

Example prompt: Watch the footer of https://example.com for me — run a check now and tell me if anything has changed since the last time you looked, including exactly which fields are different and what they changed from and to.

## When to prefer this

Use this endpoint when you need to detect whether a web page's footer has changed since a previous check, rather than just extracting the footer once. It is ideal for scheduled monitoring workflows where you want to be alerted on changes, track before/after diffs, and avoid re-processing unchanged content. Prefer this over the plain extract-footer-as-json endpoint when change detection and historical comparison are the goal.

## Known failure modes

- Target URL is unreachable or returns a non-200 status — check fails with an error
- Page has no footer element — returns empty result with changed flag potentially false
- First-time call for a URL has no previous result to compare against — changed field may be indeterminate
- 90-day history window expired — previous snapshot no longer available for comparison
- Payment of $0.02 USDC not processed — request rejected

## How this service works

Change watch for extract footer as json: runs the check, compares it with the result from your previous call for the same url (kept 90 days) and returns the current answer, changed true/false, the fields that changed with before/after values, and when it was last seen. Schedule it to be alerted when this changes. $0.02 per check.

## Output

Returns the current footer content as a JSON object, a boolean 'changed' flag indicating whether it differs from the previous check (stored up to 90 days), a list of fields that changed with their before and after values, and the timestamp of when the footer 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/extract-footer-as-json-change-watch-4f65b12b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from page.intel.rallylive.ca](https://www.zero.xyz/host/page.intel.rallylive.ca/llms.txt)