# Free Books – Literature Subject Catalogue

> Free Books – Literature Subject Catalogue 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 tagged under 'Literature' from Project Gutenberg and Internet Archive, ranked by relevance and popularity, with epub/txt/html download links.

## Facts

- Endpoint: GET https://intel.rallylive.ca/library/subject/literature
- 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-literature-subject-catalogue-dbd59210
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_aU1hLFPBsDMK68wpXdh48

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-literature-subject-catalogue-dbd59210
```

Example prompt: Can you pull up the free public-domain literature catalogue and show me the most popular classic novels available to download — ideally ones by authors like Dickens or Austen?

## When to prefer this

Choose this endpoint when you need free, legal, public-domain literary books from authoritative sources (Project Gutenberg, Internet Archive) with direct download links. Ideal for agents building reading lists, educational tools, or content pipelines that require classic literature in machine-readable formats. Prefer over general web search when you specifically need verified, downloadable ebook files rather than HTML previews or paywalled content.

## Known failure modes

- No results returned if search keywords are too specific or misspelled
- Rate limiting or payment failure if USDC payment of $0.01 is not processed
- Occasional broken download links if source libraries have moved files
- Empty result set for niche keyword combinations not matching any catalogued works

## How this service works

Free public-domain books on "Literature": browse the catalogue's works tagged with that Library of Congress subject (358 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 per page) of public-domain books tagged 'Literature', including title, author, relevance/popularity rank, subject tags, and direct download links in epub, txt, and/or html formats. Data is 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-literature-subject-catalogue-dbd59210/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)