Top 27 API Building Resources For Developers

Free AI and machine learning job board with 7,600+ jobs from 480+ companies. Includes a free REST API and MCP server for programmatic access.

Apigee, part of Google Cloud, helps leading companies design, secure, and scale application programming interfaces (APIs). Try Apigee Edge for free.

Unleash the potential of your applications and accelerate development with a single API Key and access to 100s of APIs. Start for free.

Appwrite provides web and mobile developers with a set of easy-to-use and integrate REST APIs to manage their core backend needs.

Creduse is a plug-and-play solution that lets developers integrate credits into their platforms via API without a lot of hassle. It’s aimed at startups and businesses that want to boost sales, user engagement, and retention.

The end-to-end backend development platform that automatically provisions all your cloud infrastructure, based on your business logic.

Instagram feed API that handles OAuth and automatic token refresh, serving posts as JSON, GraphQL, or RSS. Free tier available.

Helps you create requests faster, saving precious time on development.

Design & Debug APIs like a human, not a robot.

Real-time bot detection and fraud prevention API. Combines IP reputation, VPN/proxy detection, and email validation in a single call. Free tier: 100 requests/day.

Fake REST APIs powered by Lua.

A fun and productive framework for building serverless apps.

Simple website uptime monitoring tool to monitor your websites and APIs combined with public status pages.

Paw is a full-featured HTTP client that lets you test and describe the APIs you build or consume. It has a beautiful native macOS interface to compose requests, inspect server responses, generate client code and export API definitions.

Postman makes API development easy. Our platform offers the tools to simplify each step of the API building process and streamlines collaboration so you can create better APIs faster.

Use RapidAPI to Find, Connect, & Share 1000s of APIs using our Multi-cloud platform. Improve Developer Experience with API Design, Testing, Monitoring, & More!

ReqKey validates API keys, meters credits, enforces rate limits, and logs every request — from a single SDK call inside your own middleware.

Build and test APIs faster. Lightweight Git-friendly API client built for modern developers.

Retool is the fast way to build internal tools. Drag-and-drop our building blocks and connect them to your databases and APIs to build your own tools, instantly. Connects with Postgres, REST APIs, GraphQL, Firebase, Google Sheets, and more. Built by developers, for developers. Trusted by startups and Fortune 500s. Sign up for free.

RouterBase is an AI API gateway for developers and small teams. Through a single OpenAI-compatible endpoint, it provides access to 200+ AI models from providers like OpenAI, Anthropic, Google, and Meta, with smart routing, automatic failover, and unified usage and cost tracking.

Serverless Stack (SST) is a framework that makes it easy to build serverless applications.

Convert Google Sheets to JSON API - Speed up your prototyping by skipping API development and using Google Sheets instead.

Simplify API development for users, teams, and enterprises with our open source and professional toolset. Find out how Swagger can help you and get started today.

Generate PDFs from reusable templates via API. Design templates visually, then generate documents with dynamic data using a REST API or SDKs in 7 languages.

Treblle is the ultimate end to end APIOps Platform for Engineering and DevOps teams. Simplify and elevate your REST API development with our comprehensive solution that offers insightful observability of APIs in a single, user-friendly interface.

Offline, Git Native API Client - Design, Test & Document APIs in one place. Plain text executable files all the way. Community plugins.

One API for GPT, Claude, and Gemini with native protocol routes, scoped keys, usage records, and transparent usage-based pricing.