# library.forgemesh.io QB Astronomy & Space Science Shelf

> library.forgemesh.io QB Astronomy & Space Science Shelf is a paid API for AI agents from library.forgemesh.io, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-16).

Returns a ranked list of up to 50 public-domain astronomy and space science books from the QB curated shelf, with drill-down routes for full-text retrieval

## Facts

- Endpoint: POST https://library.forgemesh.io/qb
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/library-forgemesh-io-qb-astronomy-space-science-shelf-3a57662b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Jr1YaY1F9uryWJAao9cSx

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 library-forgemesh-io-qb-astronomy-space-science-shelf-3a57662b -d '<json body>'
```

Example prompt: Can you show me the top 20 public-domain astronomy books from the ForgesMesh library shelf — things like Mars rover image books or classic stargazing guides?

## When to prefer this

Choose this endpoint when you need a curated, ranked catalog of public-domain astronomy and space science books (Library of Congress classification QB) without any API key or licensing overhead. Prefer it over a full-text search endpoint when you want a browsable shelf of titles rather than passage-level results, or over generic book APIs when you specifically need free, openly accessible texts in the astronomy domain.

## Known failure modes

- Payment not included or insufficient — endpoint requires $0.003 USDC via x402 protocol
- Limit parameter exceeds maximum of 50 — server may reject or cap response
- Invalid input schema (e.g. non-integer limit) — may return a 400 error
- Network timeout or service unavailability — no cached fallback guaranteed

## How this service works

Curated shelf: QB — 153 public-domain books including Color Images from Mars Rovers Spirit and Opportunity, Astronomy for beginners, The Story of the Heavens. Returns a ranked list with drill-down routes for full-text retrieval. No license, no API key required.

## Output

A ranked list of public-domain astronomy and space science books (up to 50 entries by default returning 20), each with metadata and drill-down routes that allow retrieval of the full text. Titles include works such as Color Images from Mars Rovers Spirit and Opportunity, Astronomy for Beginners, and The Story of the Heavens.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "limit": {
   "type": "integer",
   "description": "Max books to return (default 20, max 50)"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "books": [
   {
    "year": null,
    "title": "Color Images from Mars Rovers Spirit and Opportunity",
    "author": "Webster, Bob",
    "book_id": 12082,
    "subjects": [],
    "download_count": 23375
   }
  ],
  "count": 5,
  "shelf": "QB",
  "coverage": {
   "target": 61015,
   "indexed": 61015
  },
  "drill_down": [
   "/book-metadata",
   "/book-chapter",
   "/book-quotes",
   "/literature-search"
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/library-forgemesh-io-qb-astronomy-space-science-shelf-3a57662b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from library.forgemesh.io](https://www.zero.xyz/host/library.forgemesh.io/llms.txt)