Awesome REST APIs

Currated collaborative list of open (freely available without registration) RESTful API web services. We list each service with a short description, followed by a link demonstrating a representative example of its use. You can use the link on your web browser, through the Unix command line with the curl utility, or with any modern programming language, for example with Python's Requests.

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• For more awesome lists, see awesome.

Contents

• Bioinformatics
• Computer networking
• Computer software
• Entertainment
• General
• Medicine
• Software Development
• Transport

Bioinformatics

• Ensembl - Access genomic data for Homo Sapiens and other organisms. Mutations, DNA sequences, Transcripts and Proteins. Useful also to locate known genotype-phenotype associations; example
• MyVariant.info - Access genetic variation information for approximately 1 billion DNA loci. Read more here; example

Computer networking

• BGP queries - The internet viewed from the Border Gateway Protocol lens; example.
• Network client information - Report the client's IP address and country; example.

Computer software

• GitHub - Metadata on public repositories hosted on GitHub; example.
• Docker Hub - Metadata on public container image registries hosted on Docker Hub; example.

Entertainment

• MusicBrainz - Recorded music database; example
• Vedika - AI-powered Vedic astrology API with 108+ endpoints for birth charts, horoscopes, kundali matching, and natural language astrology queries; Example

General

• DOI metadata - Search and obtain metadata associated with Digital Object Identifiers; example.
• DOI resolution - Resolve Digital Object Identifiers to their target URL; example.
• Public APIs - List of public APIs; many require registration.
• Wikidata - Collaboratively edited knowledge base hosted by the Wikimedia Foundation; example.

Medicine

• Europe PMC - Access to over 33 million publications from various sources, including PubMed, Agricola, the European Patents Office (EPO) and the National Institute for Clinical Excellence (NICE); example

Software Development

• Beeceptor OpenAPI Mock Server - Upload your OpenAPI spec and get instant, AI-powered test data and demo-ready API endpoints. Beeceptor is free, fast, and no login is needed.; Example
• JSONPlaceholder - Fake Online REST API for Testing and Prototyping; Example: 100 Fake Posts
• Lorem Picsum - Easy to use, image placeholders; Example
• Placehold - Free image placeholder service for web designers, serving billions of images each year. Example
• Zuplo: OpenAPI-Powered API & MCP Management platform for Security, Deployment, and Documentation. Add auth, rate-limiting, and monetization to your API or MCP Server in minutes. Example

Transport

• OpenMobilityData - List of General Transit Feed Specification (GTFS) providers.

License

To the extent possible under law, Diomidis Spinellis has waived all copyright and related or neighboring rights to this work.