# Extract Buttons as JSON – Change Watch

> Extract Buttons 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 buttons (extracted as JSON) and returns whether they have changed since the last check, along with before/after diffs and last-seen timestamp.

## Facts

- Endpoint: GET https://page.intel.rallylive.ca/watch/page/buttons/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-buttons-as-json-change-watch-93c98d4d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lz_dhlWivqcVNVDzIClmm

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-buttons-as-json-change-watch-93c98d4d
```

Example prompt: Keep an eye on the buttons on https://example.com/pricing for me — let me know if anything changes, like new buttons appearing, labels being renamed, or buttons disappearing.

## When to prefer this

Use this endpoint when you need to continuously monitor a specific webpage's buttons for any changes over time, rather than doing a one-time extraction. Ideal for automated pipelines, scheduled agents, or alerting workflows where knowing what changed (and what it looked like before) is more important than just getting the current state. Prefer this over a simple extract endpoint when diff tracking and change history matter.

## Known failure modes

- Target URL is unreachable or returns a non-200 status — check may fail or return stale data
- No previous check stored (first call) — changed flag defaults to false with no before/after diff
- Page returns buttons dynamically via JavaScript that the fetcher cannot execute — buttons may not be detected
- 90-day retention window exceeded — previous result is lost and comparison resets
- Rate limits or payment failure ($0.02 USDC per call) — request is rejected

## How this service works

Change watch for extract buttons 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 set of buttons extracted as JSON, a boolean 'changed' flag indicating whether buttons differ from the previous check, a list of fields that changed with before and after values, and the timestamp of when the page was last seen. Previous results 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/extract-buttons-as-json-change-watch-93c98d4d/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)