# free-books-periodicals

> free-books-periodicals 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 with the 'Periodicals' Library of Congress subject from Project Gutenberg and Internet Archive, ranked by relevance and popularity.

## Facts

- Endpoint: GET https://intel.rallylive.ca/library/subject/periodicals
- 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-periodicals-3b469b17
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7iVru9vQ41uQshoIhF0HD

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-periodicals-3b469b17
```

Example prompt: Can you find me free public-domain periodicals I can download — specifically look for anything by Mark Twain or with 'Atlantic' in the title, and give me the epub links?

## When to prefer this

Choose this endpoint when you need to discover or download free public-domain books and publications specifically categorized under the 'Periodicals' Library of Congress subject heading, and want results aggregated from both Project Gutenberg and Internet Archive with direct download links. Prefer this over general web search when you want curated, verified, legal public-domain content with structured metadata and download URLs.

## Known failure modes

- No results returned if query keywords don't match any catalogue entries
- Pagination beyond available pages returns empty results
- Download links may occasionally be stale between daily re-verification cycles
- Rate limiting or payment failure (x402) if USDC payment is not properly handled

## How this service works

Free public-domain books on "Periodicals": browse the catalogue's works tagged with that Library of Congress subject (283 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 (up to 20 items per page) of public-domain books and periodicals tagged with the Library of Congress 'Periodicals' subject, including titles, authors, relevance/popularity rankings, and direct download links in epub, txt, and html formats. Results are re-verified daily and sourced from Project Gutenberg and Internet Archive.

## 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-periodicals-3b469b17/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)