# HTML Tables to JSON Change Watch

> HTML Tables to JSON 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 HTML tables-to-JSON conversion output and reports whether it has changed since the last check, including field-level diffs.

## Facts

- Endpoint: GET https://intel.rallylive.ca/watch/site/tables
- 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/html-tables-to-json-change-watch-dd656748
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_R-RtTb7LN4eZwHEHl6hVF

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 html-tables-to-json-change-watch-dd656748
```

Example prompt: Keep an eye on the HTML tables at https://example.com/data and let me know if anything changes — show me exactly which fields are different compared to last time.

## When to prefer this

Choose this endpoint when you need to automatically detect changes in HTML table data on a specific webpage over time, especially when you want granular field-level diffs (before/after values) rather than just knowing something changed. Ideal for scheduled agent workflows that poll a URL on a recurring basis and need to act only when table content actually changes.

## Known failure modes

- URL is unreachable or returns a non-200 status — check may fail or return an error state
- No previous result exists (first call) — changed flag may be false or indeterminate with no diff
- HTML tables absent from the page — returns empty JSON with no meaningful diff
- Rate limiting or access restrictions on the target URL — may return incomplete or error data
- Results older than 90 days are purged — historical comparison window resets

## How this service works

Change watch for html tables to json: 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 html tables to json changes. $0.01 per check.

## Output

Returns the current HTML-tables-to-JSON extraction result for the URL, a boolean indicating whether the output changed since the last call, a field-level diff showing exactly which values changed with before and after values, and a timestamp of when the data was last seen. Previous results are retained for 90 days.

## 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/html-tables-to-json-change-watch-dd656748/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)