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Public APIs Registry

A collective list of 3,000+ free APIs for use in software and web development. Data is sourced from community-driven repositories.

Browse 4,000+ AI MCP Servers
APIDescriptionAuthHTTPSCORSCategory
Advanced Multilanguage AI Translator (RapidAPI)AI-powered translator supporting multiple languages with fast, context-aware responsesapiKey YesYesAI
AI Benchmark IndexAI benchmarks with traceable data, licences and scoresNone YesYesAI
AI Learning EngineCreate, auto-grade, and analyze learning tasks with AI-based evaluationsapiKey YesYesAI
AI/MLAccess 100+ curated AI Models over 1 APIapiKey YesYesAI
API RouteOpenAI-compatible multi-model gateway for chat completions with API keys and usage-based billingapiKey YesYesAI
APIClawFlat-rate OpenAI-compatible gateway for Claude, GPT, DeepSeek, Qwen, Kimi and GLM modelsapiKey YesYesAI
APIModelsOpenAI-compatible API for 150+ image, video, audio and LLM models: automatic channel failover, failed calls not billed, most prices below official ratesapiKey YesYesAI
AzuradeImage and video generation with 30+ models (Veo, Seedance, Nano Banana) over one REST API, paid per generation from credits that never expireapiKey YesYesAI
ChatwithBuild custom ChatGPT-style AI chatbots trained on your website and files, integrated with 5000+ apps — no coding, live in minutes.apiKey YesYesAI
Cheaper InferenceOpenAI-compatible LLM gateway: one API key for chat models from several labs, plus an Anthropic-compatible Messages endpointapiKey YesNoAI
CitedSpyTrack brand visibility, share of voice, and citations across AI engines like ChatGPT, Gemini, and ClaudeapiKey YesUnknownAI
cogDepotMarketplace API for AI agents to post service listings, negotiate terms, and finalize deals, with an A2A Agent Card and JSON-RPC endpointapiKey YesNoAI
CohereHarness the power of language understanding. Join the developers and businesses who are using Cohere to generate, categorize and organize text at a scale that was previously unimaginable.apiKey YesYesAI
CustomGPT.aiRAG API with RESTful endpoints, comprehensive SDKs, and enterprise-grade reliability.apiKey YesYesAI
EdenGet all AI models in one place, e.g. OpenAI, Google and lots more!apiKey YesYesAI
Face-api.jsJavaScript API for face detection, recognition, and emotion analysis using TensorFlow.jsNone YesUnknownAI
GandrText to speech API for voice agents. One voice in 23 languages, every render watermarkedapiKey YesYesAI
GeekflareGeekflare is for web scraping, search, and data extraction, letting developers pull structured data from any website for AI agents and automation workflowsapiKey YesYesAI
GenRelayUnified API for image and video generation models (Nano Banana, Seedance, GPT Image, Veo), pay-as-you-go in USD with free creditsapiKey YesYesAI
GladiaArtificial intelligence API'sapiKey YesNoAI
HarnessRouterRun coding agent harnesses (Codex, Claude Code, Hermes) behind your product through one APIapiKey YesUnknownAI
isGenAICheck images, text and URLs for recorded evidence of AI use, such as C2PA Content Credentials, IPTC AI labels and saved promptsNone YesNoAI
ISMS CopilotOpenAI-compatible text-only compliance completions: curated framework knowledge (100+ modules) injected before generation and disclosed on successapiKey YesNoAI
MachinetutorsAI Solutions: Video/Image Classification & Tagging, NSFW, Icon/Image/Audio Search, NLPapiKey YesYesAI
Magic HourGenerate and edit AI videos, images, and audio through a self-serve REST APIapiKey YesYesAI
NeurontoFree search over MCP servers, A2A agents, skills and APIs across Agentic Resource Discovery registriesNone YesYesAI
Obscurify AIAnonymous OpenAI-compatible API for 200+ LLMs. Accounts are a random number, no email; pay with Monero, Bitcoin or cardapiKey YesYesAI
OpenAIUse AI models such as ChatGPT or DALL-E to experience the capabilities of AIapiKey YesYesAI
PictographLabel images with SAM3, train RF-DETR and YOLOX detectors, and run them on GPU endpoints that take live RTSP and WebRTC videoapiKey YesNoAI
Prismix Status APIReal-time uptime and incident status for 75+ AI services (OpenAI, Anthropic, Cursor, Gemini)None YesYesAI
RequestyOpenAI-compatible gateway that routes requests to 600+ models from 30+ providers, with fallbacks, caching and spend trackingapiKey YesYesAI
RouterBase APIOne OpenAI-compatible API for accessing 200+ AI models from OpenAI, Anthropic, Google, Meta, xAI, DeepSeek, and moreapiKey YesUnknownAI
Spam HunterFree service to classify text as spam using MLapiKey YesYesAI
Summarize Text with AIThis API generates customizable summaries of text and web pages using AIapiKey YesYesAI
SynapOpenAI-compatible API for open-weight models: chat completions, streaming, tool calling and JSON-schema output, billed per tokenapiKey YesNoAI
TranscriptFetchThe transcript API for social media video. Get transcripts at scale from YouTube, TikTok or Instagram.apiKey YesYesAI
TranslateMyImageTranslate the text inside JPG, PNG or WEBP images into 9 languages and get the translated image backapiKey YesNoAI
UnoRouterOpenAI-compatible gateway routing chat/completions across 500+ models with a free tierapiKey YesYesAI
UpResImage, video and speech restoration up to 8K through a self-serve REST APIapiKey YesNoAI
Voxell ForgeOpenAI-compatible text embeddings API. The turbo model is free forever with no credit card; pro and ultra are paidapiKey YesNoAI
WaveSpeedAIGenerate images, video and audio from 900+ open and commercial models (FLUX, Seedream, Kling, Wan) through one async REST APIapiKey YesYesAI
XiuRouterRoute requests to leading AI models through one API with native OpenAI, Anthropic, and Gemini protocolsapiKey YesYesAI
Amazing Endemic SpeciesAmazing endemic species all over the worldNone YesYesAnimals
AxolotlCollection of axolotl pictures and factsNone YesNoAnimals
Breed Health ScoreDog breed health scores, median lifespans and conditionsNone YesNoAnimals
Cat FactsDaily cat factsNone YesNoAnimals
Cat FactsRandom cat factsNone YesYesAnimals
CataasCat as a service (cats pictures and gifs)None YesUnknownAnimals
CatsPictures of cats from TumblrapiKey YesNoAnimals
CatsPictures of cats from TumblrapiKey YesNoAnimals
Showing 1 to 50 of 3405 APIs
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Free Public APIs for Web Development

Discover over 3,000 free, public APIs for your next side project, hackathon, or startup. We've aggregated data from multiple community-driven repositories to provide a single, searchable interface for finding APIs across categories like Finance, Weather, Sports, and Machine Learning.

Build with Public APIs

Once you find an API you want to build with, use our suite of free developer tools to accelerate your workflow:

  • AI MCP & Tools Registry — Want to expose or consume APIs through AI agents? Explore 4,000+ open-source Model Context Protocol servers for Claude Desktop, Cursor, and custom agents.
  • JSON to TS & Zod — Paste the API's JSON response to instantly generate TypeScript interfaces and Zod validation schemas.
  • Mock Data Generator — Build your own mock endpoints based on the schemas of these public APIs.
  • JWT Decoder — If the API requires OAuth or JWT authentication, use this tool to inspect the token claims.
Data Sources & Credits
This registry is compiled at build-time from the following open-source GitHub repositories:public-apis/public-apis•public-api-lists/public-api-lists•marcelscruz/public-apis