Best Open Data APIs (2025)

Unofficial US Federal Government API Development

The Internet Archive is a nonprofit organization committed to Universal Access of Knowledge. The Archive runs several services including the Archive.org search engine, OpenLibrary, and the Wayback Machine. In alignment with its mission, the Archive encourages developers to add media to archive.org, as well as to consume and re-purpose media and its metadata, for the great good of our community and beyond.

Aztro API provides you with daily horoscope (yesterday, today and tomorrow). aztro is for a developer who wants an API that provides horoscope info for sun signs such as Lucky Number, Lucky Color, Mood, Color, Compatibility with other sun signs, description of a sign for that day etc.

RESTful Bible API with 7 versions, 4 languages and multiple features

Location Information Prediction

Data on higher education institutions in the United States

The Creative Commons Catalog API ('cccatalog-api') is a system that allows programmatic access to public domain digital media. It is our ambition to index and catalog billions of Creative Commons works, including articles, songs, videos, photographs, paintings, and more. Using this API, developers will be able to access the digital commons in their own applications.

We've designed our APIs to use open standards so developers can leverage off-the-shelf libraries. We aim to provide APIs that are as simple as possible yet still open the door to great possibilities.

Broadest collection of public data. Retrieve detailed information about a business using its name, location or an associated person. Or you can view screen alerts to make sure named individuals and companies are not sanctioned entities.

Broadest collection of public data

Evil Insults. You can generate JSON, text or XML responses by making a query seeking data in a specific language and response type. The API also shows you the number of times a particular insult has been fetched from the server. It can be added by a specific person or a website.

Faker API it's a collection of completely free APIs that helps web developers and web designers generate fake data in a fast and easy way. No registration is required. No tokens, no authentication. Every resource allows to choose the API language by "_locale" parameter and also allows to select the number of rows requested by "_quantity" parameter. Max 1000 rows.