# Zvab — 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 for used and antiquarian books on ZVAB.com by ISBN to instantly access pricing, condition details, seller information, and shipping rates from multiple dealers. Compare listings across the marketplace to find the best deals on rare and out-of-print books.

**Category:** Marketplaces | **Website:** [www.zvab.com/](https://www.zvab.com/) | **Docs:** [parse.bot/marketplace/f88b530f-c92a-4bf2-9804-cc7659cc926b/zvab-com-api](https://parse.bot/marketplace/f88b530f-c92a-4bf2-9804-cc7659cc926b/zvab-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/zvab/`
**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 listing

Retrieve full details for a specific ZVAB listing by its numeric listing ID or full listing URL. Returns comprehensive information including title, author, publisher, year, ISBNs, price, condition, binding, seller name and location, full description, and shipping rates with per-destination cost breakdowns (standard and express).

**Estimated cost:** Metered

| Field | Type | Required | Description |
|-------|------|----------|-------------|
| `listing_id` | string | Yes | Numeric listing ID (e.g. 32374088414) or full listing URL (e.g. https://www.zvab.com/.../32374088414/bd). Obtainable from search_by_isbn results. |

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

### Search by isbn

Search ZVAB for all active used/antiquarian book listings matching an ISBN-10 or ISBN-13. Returns paginated results (20 per page) sorted by relevance. Each listing includes title, author, publisher, year, price, condition, binding, seller details, and shipping cost to the configured destination. Results are auto-iterated across pages.

**Estimated cost:** Metered

| Field | Type | Required | Description |
|-------|------|----------|-------------|
| `isbn` | string | Yes | ISBN-10 (10 digits) or ISBN-13 (13 digits). Hyphens are stripped automatically. |
| `page` | integer | No | Page number for pagination. Each page returns up to 20 listings. |

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

## 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.