This GitHub repo is a powerhouse collection of APIs you can start using immediately to build everything from simple automations to full-scale applications. One of the most valuable API lists on GitHub—period. 💪

📜 A collective list of public GraphQL APIs

🌐 Wikipedia for Web APIs. Directory of REST API definitions in OpenAPI 2.0/3.x format

The ultimate collection of APIs for building autonomous AI agents — 2,036 production-ready APIs across Agents, AI Models, and MCP Servers. Stop wasting weeks building infrastructure. Plug these in and ship your agent today.

The World's Most Comprehensive, Authoritative, and Structured Open Source Data Source Knowledge Base

A massive, auto-updated directory of more than 50,000 public APIs for developers, covering AI, data, authentication, finance, maps, weather, analytics, and thousands of integration-ready endpoints. The list updates automatically and keeps expanding, giving developers the largest and most up-to-date API resource in one place. 🚀

Public source-backed Arab-world agent skills: APIs, marketing, sales, support, localization, Arabic NLP, open data, and MENA workflows.

Nexus-AGI — a public AGI service directory & API registry for autonomous agents. Supports .well-known autodiscovery, OpenAPI schemas, and integration with AI models, tools, and services.

Curated directory of best API repos, guides & resources for developers

A curated list of the most AI-agent-ready APIs, scored by the Jentic API AI-Readiness Framework

⭐ A curated collection of AI APIs that provide free credits, free tiers, or developer trials. Perfect for developers, startups, indie hackers, and AI builders to experiment and build AI-powered applications.

✨The Free API Directory which is friendly to AI🤖, with complete API documentation and easy for AI to understand and use.

🛠️ Developer's Swiss Army Knife — CLI tools, Snippet Vault & Public API Directory in one monorepo

Persian-first, machine-readable directory of free LLM APIs with quotas, OpenAI compatibility, official sources, and Iran-access evidence.

Public APIs is a community-curated collective list of over 1,400 free APIs organized across 50+ categories, maintained by contributors and the team at APILayer. It is one of the most popular open-source projects on GitHub with over 400k stars.

356 Production-Ready REST APIs for developers. Fast, reliable, and easy to integrate.

A public GraphQL API providing structured data on programming languages, their creators, and related frameworks and tools. Perfect for developers, educators, and anyone exploring modern technology stacks.

A collaborative open-source API Hub where developers can discover and share free APIs.

200+ Manually Curated APIs for Developers | AI, Travel, Payments, Gaming ,crypto,& More | Free API Directory and Marketplace

APIs.io is an open source API search engine and directory that uses APIs.json files to discover, index, and catalog APIs across the web. Built on the APIs.json specification, it provides a searchable entry point for developers to find public APIs by keyword, resource, action, persona, domain, and schema.