How do I get a free Gutendex API key?

Gutendex does not require an API key (Zero-Auth). You can call the endpoints directly with cURL, Fetch, or Python without creating an account or providing authorization tokens.

What is the rate limit for Gutendex API?

Gutendex provides a free tier rate limit of: Unlimited. For high-throughput production requirements beyond this allowance, refer to their official documentation.

Can I use Gutendex in commercial projects?

Most free endpoints permit commercial or prototyping use within fair use terms. Please inspect official provider docs for production SLAs.

Does FreeAPI store data or charge fees for this service?

No. FreeAPI is an independent API directory and developer showcase. It does not sell third-party data or charge fees; it connects developers directly to official public endpoints.

Education & ScienceFreeAPI GatewayFeatured

GutendexFree REST API

Project Gutenberg public domain e-book search and metadata catalog

API Docs

Developer Workbench & Live ConsoleZero-Auth

Test real endpoints directly, inspect live JSON, or copy implementation code.

Official Docs

Endpoint Requestready

GET

curl -X GET "https://gutendex.com/books/?ids=1" \
  -H "Accept: application/json"

ResponseReady / Idle

Ready for Live Evaluation

Click [ Send Request ] to dispatch a real request via FreeAPI proxy and inspect real JSON payloads.

Rate Limit

Unlimited

Auth Mode

Zero-Auth (Public)

Security & CORS

HTTPS • CORS Ready

Protocol

REST / JSON

DigitalOcean

$200 Free Cloud Credit

ScraperAPI

5,000 Free API Credits

Bright Data

Web Unlocker & Proxies

COMPANION DEVELOPER TOOL0ms Client Sandbox

Text Readability & Content Metrics Analyzer

Calculate Flesch Reading Ease, Grade Level, Gunning Fog index, syllable counts, and reading durations in real time.

Launch Tool

Interactive Web Tool Available

Test and interact with this service in your browser using our Text Readability & Content Metrics Analyzer tool.

Open Live Tool

Frequently Asked Questions (FAQ)

Technical and integration answers for Gutendex.

Yes, Gutendex is listed as a free endpoint on FreeAPI Directory with an allowance of: Unlimited.

Official Service Provider Ownership: Gutendex

All data feeds, trademarks, and documentation belong directly to the original API provider. FreeAPI serves purely as a discovery index and documentation reference for developers.

DMCA / Takedown Request

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