# free-works-by-subject

> free-works-by-subject is a paid API for AI agents from intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).

Browse public-domain books, audiobooks, and films organized by Library of Congress subject headings or LibriVox genres, returning matching works with download links.

## Facts

- Endpoint: GET https://intel.rallylive.ca/library/subject
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/free-works-by-subject-b1a3b930
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_M_bR_QDE7HkrSIzd-cI_l

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-works-by-subject-b1a3b930
```

Example prompt: Can you find me free public-domain works about detective and mystery stories — I'm looking for books or audiobooks I can download for free?

## When to prefer this

Choose this endpoint when you need to browse or discover public-domain works by topic, genre, or subject category — especially when you want to explore what's available rather than search for a specific title. It is well-suited for finding free downloadable books, audiobooks, and films categorized under Library of Congress subject headings or LibriVox genres.

## Known failure modes

- No works found for an obscure or misspelled subject heading — returns empty results
- Subject string does not match any Library of Congress heading or LibriVox genre — no results returned
- Network or upstream library source unavailable — service may return an error
- Payment of $0.01 USDC not completed — request rejected with 402 Payment Required

## How this service works

Browse free works by subject or genre (Library of Congress subject headings and LibriVox genres): 'detective and mystery stories', 'physics', 'french poetry', 'documentary'. Returns matching public-domain books, audiobooks and films with download links. $0.01 per browse.

## Output

A list of matching public-domain books, audiobooks, and/or films filtered by the requested subject heading or genre, each including metadata (title, author, format) and direct download links.

## 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-works-by-subject-b1a3b930/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)