Feature

Public / No Authentication

Open endpoints callable without credentials.

14 providers 47 APIs 5 declared variants

At least some endpoints are usable with no key or token at all, which makes evaluation, prototyping, and open-data consumption immediate. Common across government and reference-data APIs.

14 API providers on the APIs.io network offer public / no authentication. The highest-rated are IOTA, Datamuse, PokéAPI, VA Lighthouse, Frankfurter.

Providers

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Strong 1 Solid coverage with minor gaps
IOTAIOTA is an open-source distributed ledger technology built to bring real-world applications on-chain. It is...2 APIs55.2
Developing 4 Usable, with meaningful gaps to close
DatamuseDatamuse operates a word-finding query engine and lexical search service for developers, educators, and cre...1 API47.8PokéAPIPokéAPI (pokeapi.co) is a free, open-source RESTful and GraphQL API serving comprehensive Pokémon data — in...1 API44.8VA LighthouseVA Lighthouse is the US Department of Veterans Affairs' developer API platform. Published at developer.va.g...22 APIs41.6FrankfurterFrankfurter is an open-source (MIT) currency exchange rates API that blends foreign-exchange reference rate...2 APIs40.0
Thin 9 Limited public surface area
Agricultural Marketing ServiceThe Agricultural Marketing Service (AMS), an agency of the United States Department of Agriculture (USDA), ...4 APIs38.1TIERTIER Mobility was a Berlin-headquartered shared electric micromobility operator founded in 2018 by Lawrence...1 API37.9Punk APIPunk API is a free, no-auth REST API exposing BrewDog's "DIY Dog" open-source beer recipe collection — 325 ...1 API36.3Ron Swanson QuotesA community-built, open source HTTP API that returns Ron Swanson quotes from the NBC television series Park...1 API35.0JSONPlaceholderJSONPlaceholder is a free, no-auth fake REST API for prototyping, tutorials, and testing. It exposes six re...1 API34.9Studio GhibliStudio Ghibli API — a community-built, unofficial, fan-made, MIT-licensed REST API that catalogs the people...5 APIs33.0Quote GardenQuote Garden is a free, open-source REST API that serves more than 75,000 famous quotes. Built by Prathames...1 API30.6U.S. Treasury Fiscal DataThe U.S. Treasury Bureau of the Fiscal Service manages the government's finances including collecting reven...4 APIs28.5FakerAPIFakerAPI is a free, no-authentication REST API that returns realistic fake data for developers, designers, ...1 API27.9

What Providers Actually Declared

This feature is a canonical term. These are the free-text strings providers wrote in their own apis.yml that map onto it.

No API Key RequiredNo AuthenticationNo Authentication RequiredOpen, unauthenticated public data — no API key requiredOpen-data facilities, forms, and reference-data APIs (no auth required for read endpoints)

Scroll for all 5

Work with this as data

Every feature here is available over the APIs.io API and to AI agents over MCP. Features is not yet its own endpoint on the v1 API. Reach it through catalog search and the tag graph, or the MCP server.

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Tools for features

3 MCP tools reach this
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
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Call it yourself

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curl "https://apis.io/api/v1/search?q=no-auth-public&limit=10"
Everything under a tag 
curl "https://apis.io/api/v1/tags/no-auth-public"

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