Gutendex vs Wizard World

Gutendex is a free, open-source JSON API — built independently of Project Gutenberg — that wraps its roughly 75,000 public-domain ebooks with searchable, paginated metadata: authors, subjects, bookshelves, languages, and direct links to every available download format from plain text to EPUB and Kindle. No account or key is needed to query it, and the project's own source enables cross-origin requests from any domain rather than restricting them. Anyone needing sustained high-volume traffic is asked to run their own instance of the open-source server instead of hammering the public one.

A community-run REST API mirroring the Harry Potter Wiki: houses (with founders, ghosts, and heads), wizards, spells, elixirs, ingredients, and magical creatures, each returned as detailed JSON. Built and maintained by a small volunteer team (MossPiglets) on .NET/ASP.NET Core with a public Swagger spec, hosted free on Heroku with no key, account, or documented rate limit beyond the dyno's own capacity.