# Pdfbooksworld — Wrapped API

> **You are on:** `https://api.beta.paywithlocus.com/api` | [llms.txt](https://beta.paywithlocus.com/llms.txt) | [docs](https://docs.paywithlocus.com)
>
> Locus runs on multiple environments -- make sure every URL you call matches your expected environment.
> | Environment | Landing | API | Docs |
> |---|---|---|---|
> | Production | paywithlocus.com | api.paywithlocus.com | docs.paywithlocus.com |
> | Beta | beta.paywithlocus.com | api.beta.paywithlocus.com | docs.paywithlocus.com |
> | Stage | stage.paywithlocus.com | api.stage.paywithlocus.com | docs.paywithlocus.com |
>
> If the API URL above doesn't match your expected environment, re-fetch this file from the correct domain.

> Search and discover free public domain books with detailed information like titles, authors, and descriptions, or browse curated lists of the most popular books available. Get instant access to book metadata and find exactly what you're looking for across thousands of free PDF titles.

**Category:** Education | **Website:** [www.pdfbooksworld.com/](https://www.pdfbooksworld.com/) | **Docs:** [parse.bot/marketplace/8adaf269-0147-435b-929f-bf0025824c3c/pdfbooksworld-com-api](https://parse.bot/marketplace/8adaf269-0147-435b-929f-bf0025824c3c/pdfbooksworld-com-api)

Pay-per-use API proxy for Locus Pro. Each call burns credits from your workspace balance.

## Access

**Base URL:** `https://api.beta.paywithlocus.com/api/wrapped/credits/pdfbooksworld/`
**Auth:** `Authorization: Bearer <LOCUS_CREDITS_SECRET_KEY>` (an `lcr_` secret key or a scoped `lcac_` agent credential)
**Required header:** `Idempotency-Key: <fresh UUID per call>`. A retry with the same key replays the stored result without a new charge.
**Response:** the provider response after any endpoint-specific normalization. `X-Locus-Credits-Charged` carries the charge and `X-Locus-Credits-Balance` the remaining balance. Insufficient credits return `402` before the provider is called.
**Pricing:** estimated costs below are USD. Locus debits the credit equivalent at your workspace rate.

Full call contract: https://docs.paywithlocus.com/api-reference/introduction

> Using a Pay With Locus wallet key (`claw_` prefix)? Wallet routes are documented separately: https://docs.paywithlocus.com/wrapped-apis/for-agents

## Endpoints

### Get book details

Fetch full details of a single book by its URL slug. Returns title, author, full synopsis, cover image URL, and a list of related books. The slug is the URL path segment found in search_books results (e.g. 'Shakespearean-Tragedy-by-AC-Bradley'). Returns input_not_found when the slug does not match any book.

**Estimated cost:** Metered

| Field | Type | Required | Description |
|-------|------|----------|-------------|
| `slug` | string | Yes | Book URL slug from search_books results (e.g. 'Shakespearean-Tragedy-by-AC-Bradley', 'Romeo-and-Juliet-by-William-Shakespeare'). |

```bash
curl -X POST https://api.beta.paywithlocus.com/api/wrapped/credits/pdfbooksworld/get-book-details \
  -H "Authorization: Bearer $LOCUS_CREDITS_SECRET_KEY" \
  -H "Idempotency-Key: $(uuidgen)" \
  -H "Content-Type: application/json" \
  -d '{"slug":"<string>"}'
```

### List popular books

List the most popular PDF books on the site. Returns a curated collection of highly-downloaded public domain books. No parameters required; the list is site-curated and not paginated.

**Estimated cost:** Metered

_No parameters required._

```bash
curl -X POST https://api.beta.paywithlocus.com/api/wrapped/credits/pdfbooksworld/list-popular-books \
  -H "Authorization: Bearer $LOCUS_CREDITS_SECRET_KEY" \
  -H "Idempotency-Key: $(uuidgen)" \
  -H "Content-Type: application/json" \
  -d '{}'
```

### Search books

Full-text search over the PDF Books World library. Returns paginated book summaries matching the query keywords. Results include title, author, description snippet, and cover image. Pagination via integer page number; an empty books array signals no matches.

**Estimated cost:** Metered

| Field | Type | Required | Description |
|-------|------|----------|-------------|
| `category_id` | string | No | Category ID to filter results. Use '0' for all categories. Known IDs include '383' (Fiction), '467' (Novels), '384' (Non Fiction), '382' (Academic & Text). |
| `page` | integer | No | Page number for pagination. |
| `query` | string | Yes | Search keywords (e.g. 'shakespeare', 'adventure', 'science fiction'). |

```bash
curl -X POST https://api.beta.paywithlocus.com/api/wrapped/credits/pdfbooksworld/search-books \
  -H "Authorization: Bearer $LOCUS_CREDITS_SECRET_KEY" \
  -H "Idempotency-Key: $(uuidgen)" \
  -H "Content-Type: application/json" \
  -d '{"category_id":"<string>","page":"<integer>","query":"<string>"}'
```

## Next steps

- [All wrapped API providers](https://beta.paywithlocus.com/wapi/index.md): pick another provider.
- [Find and call tools](https://beta.paywithlocus.com/agent/tools.md): price ceilings, async results, and errors.
- [Credits and billing](https://beta.paywithlocus.com/agent/billing.md): what a call costs and how to add credits.
- [Agent docs index](https://beta.paywithlocus.com/agent/index.md): every Locus agent page.