Is the Books API free?

Yes. The Basic plan is free and includes 500 requests per month — no card needed. Paid plans start at ₹299 per month for 10,000 requests.

How much does the Books API cost?

Basic: free for 500 requests; Pro: ₹299/month for 10,000 requests; Ultra: ₹999/month for 50,000 requests; Mega: ₹2,499/month for 2,00,000 requests. Billing is monthly and you can cancel any time.

How do I use the Books API?

Subscribe to a plan on APIHiver, create an API key in the Console, then send requests to https://books.p.apihiver.com with your key in the X-API-Key header. You can also try every endpoint in the browser playground first.

What endpoints does the Books API have?

It has 4 endpoints: Search books by title, author or keyword (GET /v1/search); Book details by ISBN-10 or ISBN-13 (GET /v1/isbn/{isbn}); Search authors (name, birth date, top work, number of works) (GET /v1/authors); Popular books on a subject (e.g. history, programming, romance) (GET /v1/subjects/{subject}).

What are the Books API rate limits?

Basic: 2 requests per second; Pro: 5 requests per second; Ultra: 10 requests per second; Mega: 20 requests per second. Monthly quotas depend on the plan; every response includes X-RateLimit headers showing what's left.

Can I use one API key for the Books API and other APIs?

Yes. One APIHiver key works for every API you subscribe to, so you don't need a separate account or key per provider.

Books API

Freemium

Search millions of books by title, author or subject, look up any ISBN, and find authors — powered by Open Library.

No reviews yet

Subscribe to Test

1.8Popularity100%Service Level882msLatency

Educationisbn lookupbook searchopen librarybook covers

Pricing

₹0 / mo

₹299 / mo

₹999 / mo

₹2,499 / mo

Documentation

Search millions of books by title, author or subject, look up any ISBN, and find authors.

What you get

Search by keyword, title or author, with pagination
ISBN lookup (ISBN-10 or ISBN-13) — title, authors, publisher, pages, cover images
Authors search with birth dates and top works
Browse books by subject

Great for library and reading apps, bookshops, e-learning platforms and school projects.

Quick start

Subscribe to a plan (the Basic plan is free), then call the API at https://books.p.apihiver.com with your key in the X-API-Key header:

curl "https://books.p.apihiver.com/v1/search?q=harry%20potter&limit=2" \
  -H "X-API-Key: YOUR_API_KEY"

Endpoints

Method	Path	What it does
`GET`	`/v1/search`	Search books by title, author or keyword
`GET`	`/v1/isbn/{isbn}`	Book details by ISBN-10 or ISBN-13
`GET`	`/v1/authors`	Search authors (name, birth date, top work, number of works)
`GET`	`/v1/subjects/{subject}`	Popular books on a subject (e.g. history, programming, romance)

Open the Endpoints tab to see every parameter, example request and example response, and to try the API live.

Errors

Every error is JSON with the same shape:

{"error": {"code": "INVALID_INPUT", "message": "Pass 'q', 'title' or 'author'."}}

HTTP	Code	Meaning
400	`INVALID_INPUT`	A parameter is missing or has the wrong format — the message says which
401	`UNAUTHORIZED`	Missing or invalid `X-API-Key`
404	`NOT_FOUND`	Nothing matched the code, id or name you sent
429	—	Plan quota or rate limit reached (see the `X-RateLimit-*` headers)
502 / 503 / 504	—	A data source or the API server is temporarily unavailable — retry after a few seconds

Data & privacy

Data comes from Open Library (Internet Archive), CC0 data.

Books API FAQ

Is the Books API free?: Yes. The Basic plan is free and includes 500 requests per month — no card needed. Paid plans start at ₹299 per month for 10,000 requests.
How much does the Books API cost?: Basic: free for 500 requests; Pro: ₹299/month for 10,000 requests; Ultra: ₹999/month for 50,000 requests; Mega: ₹2,499/month for 2,00,000 requests. Billing is monthly and you can cancel any time.
How do I use the Books API?: Subscribe to a plan on APIHiver, create an API key in the Console, then send requests to https://books.p.apihiver.com with your key in the X-API-Key header. You can also try every endpoint in the browser playground first.
What endpoints does the Books API have?: It has 4 endpoints: Search books by title, author or keyword (GET /v1/search); Book details by ISBN-10 or ISBN-13 (GET /v1/isbn/{isbn}); Search authors (name, birth date, top work, number of works) (GET /v1/authors); Popular books on a subject (e.g. history, programming, romance) (GET /v1/subjects/{subject}).
What are the Books API rate limits?: Basic: 2 requests per second; Pro: 5 requests per second; Ultra: 10 requests per second; Mega: 20 requests per second. Monthly quotas depend on the plan; every response includes X-RateLimit headers showing what's left.
Can I use one API key for the Books API and other APIs?: Yes. One APIHiver key works for every API you subscribe to, so you don't need a separate account or key per provider.

Related APIs

Universities API

Education

By APIHiver · Updated 1w ago

Search universities in 200+ countries, look up a university by web domain, and verify student email addresses.

1.7291ms100%

English Dictionary API

Education

By APIHiver · Updated 1w ago

English definitions, synonyms, antonyms, rhymes, 'words that mean…' and autocomplete — fast and fully offline.

0.0——

Math Solver API

Education

By APIHiver · Updated 1w ago

Evaluate expressions, solve equations, and compute derivatives, integrals and simplifications — with exact and decimal answers.

0.8313ms100%

Public Holidays API

Travel

By APIHiver · Updated 1w ago

Public holidays for 150+ countries — including Indian states — plus 'is it a holiday?', upcoming holidays and working-day counts.

2.4395ms100%

Wikipedia Search API

By APIHiver · Updated 1w ago

Search Wikipedia in 300+ languages, get article summaries with images, 'on this day' events, random articles and autocomplete.

0.0——

Countries Info API

Data

By APIHiver · Updated 1w ago

Every country's capital, population, area, currency, calling code, languages, continent and neighbours — by code, name or currency.

0.0——

Reviews

Loading reviews…

Endpoints

4 endpoints — full list is in the sidebar on larger screens.

GETSearch books by title, author or keyword GETBook details by ISBN-10 or ISBN-13 GETSearch authors (name, birth date, top work, number of works)GETPopular books on a subject (e.g. history, programming, romance)