# PDF Link Finder Change Watch

> PDF Link Finder 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 for changes in PDF link discovery results, returning a diff with before/after values and a changed flag

## Facts

- Endpoint: GET https://intel.rallylive.ca/watch/site/pdf-links
- 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/pdf-link-finder-change-watch-a56798a5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_IWb9fpnCX3yOMF32r1P_8

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 pdf-link-finder-change-watch-a56798a5
```

Example prompt: Check the PDF links on https://example.com/reports and tell me if anything has changed since you last looked — flag any new or removed document links with before/after details.

## When to prefer this

Use this endpoint when you need to schedule periodic checks on a webpage's PDF links and want automatic diffing against a prior state — avoiding the need to store results yourself. Ideal for agents that need to react to document publication events without maintaining their own state database.

## Known failure modes

- No prior result stored (first call returns changed: false with no diff)
- URL is unreachable or returns non-200 status
- Stored result expired after 90 days, treated as first call
- Malformed or missing input URL parameter
- Payment not included or insufficient (x402 payment required)

## How this service works

Change watch for pdf link finder: 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 document link finder changes. $0.01 per check.

## Output

Returns the current PDF link finder result for the URL, a boolean 'changed' flag indicating whether the result differs from the previous call, a detailed diff showing exactly which fields changed with before and after values, and a timestamp of when the 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/pdf-link-finder-change-watch-a56798a5/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)