Frankfurter
Free currency exchange rates API.
APIsFree· OSSNo ratings
APIs
Free and public APIs for building and prototyping.
Open Library
An open catalog of every book.
APIsFree· OSSNo ratings
Public APIs
The famous list of free APIs.
APIsFree· OSSNo ratings
NASA Open APIs
Space data, free from NASA.
APIsFreeNo ratings
REST Countries
Country data via REST.
APIsFree· OSSNo ratings
PokéAPI
All Pokémon data, RESTfully.
APIsFree· OSSNo ratings
JSONPlaceholder
Fake REST API for prototyping.
APIsFree· OSSNo ratings
Open-Meteo
Free weather API, no key needed.
APIsFreemium· OSSNo ratings