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6 min readMarch 5, 2026

Best APIs Every Developer Should Use

A curated list of powerful, free APIs that can supercharge your projects — from AI and payments to maps and weather.

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Best APIs Every Developer Should Use


APIs are the building blocks of modern applications. Here's a curated list of powerful APIs that can supercharge your projects.


AI & Machine Learning


  • OpenAI API — GPT models for text generation, embeddings, and vision
  • Anthropic (Claude) — Advanced reasoning and long-context conversations
  • Hugging Face — Thousands of open-source ML models via API
  • Replicate — Run ML models in the cloud with a simple API

  • Payments & Finance


  • Stripe — The gold standard for payment processing
  • Plaid — Connect to bank accounts and financial data
  • CoinGecko — Free cryptocurrency market data

  • Communication


  • Resend — Modern email API for developers
  • Twilio — SMS, voice, and WhatsApp messaging
  • Stream — Chat and activity feed infrastructure

  • Data & Content


  • Unsplash — Free high-quality stock photos via API
  • NewsAPI — Aggregate news from thousands of sources
  • OpenWeatherMap — Weather data for any location

  • Maps & Location


  • Mapbox — Beautiful, customizable maps
  • Google Maps API — The most comprehensive mapping platform
  • ipinfo.io — IP geolocation and ASN data

  • Authentication


  • Auth0 — Enterprise-grade authentication
  • Clerk — Modern user management with pre-built components
  • Firebase Auth — Simple auth for mobile and web

  • Developer Utilities


  • GitHub API — Access repos, issues, and user data
  • Cloudinary — Image and video upload, transformation, and CDN
  • Vercel API — Programmatically manage deployments

  • Tips for Working with APIs


  • Always read the docs first
  • Handle rate limits gracefully
  • Cache responses when possible
  • Use environment variables for API keys — never hardcode them
  • Build wrapper functions for cleaner code