# Page Language Detect Watch

> Page Language Detect 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 webpage's detected language over time and reports when it changes, with before/after field diffs retained for 90 days.

## Facts

- Endpoint: GET https://intel.rallylive.ca/watch/site/language
- 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/page-language-detect-watch-6d50f2fa
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HolmDN7YH4u8KpDx8OlXB

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 page-language-detect-watch-6d50f2fa
```

Example prompt: Keep an eye on https://example.com and let me know whenever the detected page language changes — show me exactly what changed and what it was before.

## When to prefer this

Use this endpoint when you need to be notified of changes in a webpage's detected language over time rather than just getting a one-time snapshot. It is specifically suited for scheduled monitoring workflows where knowing what changed and when is important. Prefer this over a one-shot language detection call when you want diff tracking, 90-day history retention, and change alerting without building your own comparison logic.

## Known failure modes

- Invalid or unreachable URL returns an error with no comparison data
- First-time call for a URL has no baseline to compare against so 'changed' is false by default
- URLs that redirect may produce inconsistent language detection across calls
- Payment failure (x402) blocks the check from executing
- Pages behind authentication may not be accessible for language detection

## How this service works

Change watch for page language detect: 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 page language detection changes. $0.01 per check.

## Output

Returns the current page language detection result, a boolean 'changed' flag indicating whether it differs from the previous call for the same URL, a list of specific fields that changed with their before and after values, and the timestamp of the last observation. Results are retained and compared for up to 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/page-language-detect-watch-6d50f2fa/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)