# Extract Download Links as JSON – Change Watch

> Extract Download Links 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 2026-10-21).

Monitors a web page's download links (as JSON) for changes, returning the current result, a changed flag, before/after diffs, and last-seen timestamp.

## Facts

- Endpoint: GET https://page.intel.rallylive.ca/watch/page/download-links/json?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/extract-download-links-as-json-change-watch-89d60f97
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_r2s433ceu9GztriGSe1XD

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-download-links-as-json-change-watch-89d60f97
```

Example prompt: Keep an eye on the downloads page at https://example.com/downloads and let me know if any download links are added, removed, or changed compared to the last time you checked.

## When to prefer this

Choose this endpoint when you need to detect changes to download links on a specific web page over time rather than just extracting them once. It is ideal for scheduled monitoring workflows where you want diff-aware alerting (added/removed/changed links) without building your own comparison logic. Prefer it over a plain extraction endpoint when the 'has anything changed?' question is more important than the raw current state.

## Known failure modes

- Target URL is unreachable or returns a non-200 status — check will fail or return no links
- No previous snapshot exists (first call) — 'changed' will be null or false with no diff
- Page has download links behind authentication or JavaScript rendering — may not be extracted
- Snapshot has expired (older than 90 days) — no before/after comparison available, treated as first call
- Rate limit or payment failure (x402) — request rejected before check runs

## How this service works

Change watch for extract download links 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 download links as JSON, a boolean 'changed' flag indicating whether they differ from the previous call, a diff object listing which fields changed with before/after values, and the timestamp of when the page was last seen. Results are compared against a snapshot stored 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/extract-download-links-as-json-change-watch-89d60f97/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)