# free-books-indexes

> free-books-indexes is a paid API for AI agents from intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Browse and download free public-domain books on the subject of 'Indexes' from Project Gutenberg and Internet Archive, ranked by relevance and popularity

## Facts

- Endpoint: GET https://intel.rallylive.ca/library/subject/indexes
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/free-books-indexes-4a035a48
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8i9h-gDpMd2IgfngSD1Oo

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 free-books-indexes-4a035a48
```

Example prompt: Can you show me a list of free public-domain books about indexes from Project Gutenberg? I'd like direct download links for epub or text versions.

## When to prefer this

Choose this endpoint when you need a curated, daily-verified, paginated catalogue of free public-domain books specifically on the 'Indexes' Library of Congress subject, with ready-to-use download links across multiple formats. Prefer this over general web search when you need structured bibliographic results with direct epub/txt/html links rather than raw search results.

## Known failure modes

- No results returned if keyword filters are too narrow or misspelled
- Payment failure if USDC micropayment is not authorized (x402 protocol)
- Stale or broken download links if a source removes a title between daily re-verification cycles
- Empty page if requested page number exceeds total available results

## How this service works

Free public-domain books on "Indexes": browse the catalogue's works tagged with that Library of Congress subject (230 in Project Gutenberg alone, plus Internet Archive scans), ranked by relevance and popularity, with direct epub/txt/html download links. Add words to narrow by title or author. Re-verified daily. $0.01 per page of 20.

## Output

A paginated list (20 items per page) of public-domain books tagged with the 'Indexes' Library of Congress subject, sourced from Project Gutenberg and Internet Archive, including book titles, author names, relevance and popularity rankings, and direct download links in epub, txt, and html formats. Results are re-verified daily.

## 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/free-books-indexes-4a035a48/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)