# Word Frequency Change Watch

> Word Frequency 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 webpage's word frequency and alerts when it changes compared to the previous check, returning changed status and before/after field diffs.

## Facts

- Endpoint: GET https://intel.rallylive.ca/watch/page/word-freq
- 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/word-frequency-change-watch-64fbcc7a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ey-JgHHBGsilTHI1fPt4M

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 word-frequency-change-watch-64fbcc7a
```

Example prompt: Keep an eye on https://example.com/blog and let me know whenever the word frequency changes compared to the last time you checked — show me exactly which words increased or decreased and by how much.

## When to prefer this

Choose this endpoint when you need scheduled change detection for word frequency specifically — not just a one-time extraction. It is ideal for agents running on a cron-like schedule that need to know only what changed (with diffs) rather than processing raw data themselves. Prefer it over a plain word-frequency check when historical comparison and change alerting are the primary goals.

## Known failure modes

- Invalid or unreachable URL returns an error with no frequency data
- First call for a URL has no previous result to compare against, so changed is false
- Previous result older than 90 days is purged, causing a fresh baseline with no diff
- Payment failure or insufficient USDC balance blocks the check
- Target page returns non-200 status or blocks the crawler, resulting in an error

## How this service works

Change watch for word frequency: 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 word frequency for a page changes. $0.01 per check.

## Output

Returns the current word frequency analysis for the page, a boolean indicating whether the data changed since the last call, a list of fields that changed with their before and after values, and the timestamp of when the previous result 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/word-frequency-change-watch-64fbcc7a/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)