# Extract ISBNs from Web Page

> Extract ISBNs from Web Page is a paid API for AI agents from page.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).

Fetches a web page URL and returns all ISBNs found in the page text and markup, deduplicated with occurrence counts (up to 300 items).

## Facts

- Endpoint: GET https://page.intel.rallylive.ca/page/extract/isbns?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/extract-isbns-from-web-page-d7b873a5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gE75EF9I4JQHU3FHYh8dN

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-isbns-from-web-page-d7b873a5
```

Example prompt: Can you extract all the ISBNs from this page — https://www.bookshop.org/lists/staff-picks — and tell me how many times each one appears?

## When to prefer this

Use this endpoint when you need to quickly extract all ISBN identifiers from a web page without writing HTML parsing code. It is ideal for book catalog pages, publisher sites, library lists, and e-commerce pages where ISBNs appear in text or markup. Choose this over generic scraping tools when the specific output you need is ISBNs — it handles deduplication and counting automatically. It is particularly well-suited for agents building book inventories, bibliographic databases, or price-comparison tools that need structured ISBN data from arbitrary URLs.

## Known failure modes

- URL is unreachable or returns a non-200 status — no ISBNs returned
- Page contains no ISBNs — empty result set returned
- Page is JavaScript-rendered and ISBNs only appear after JS execution — may miss dynamically loaded ISBNs
- More than 300 unique ISBNs on page — results capped at 300
- Malformed or invalid URL input — request fails with an error
- ISBNs embedded in image alt text or non-text assets — may not be captured

## How this service works

Extract isbns from a web page: fetches the URL and returns every isbns found in the page text and markup (deduplicated, with counts and up to 300 items), so an agent gets the values without parsing HTML. $0.01 per page.

## Output

A deduplicated list of up to 300 ISBNs found in the page's text and HTML markup, each accompanied by an occurrence count indicating how many times it appeared on the page.

## 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-isbns-from-web-page-d7b873a5/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)