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.

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

Stripe — The gold standard for payment processing

Plaid — Connect to bank accounts and financial data

CoinGecko — Free cryptocurrency market data

Resend — Modern email API for developers

Twilio — SMS, voice, and WhatsApp messaging

Stream — Chat and activity feed infrastructure

Unsplash — Free high-quality stock photos via API

NewsAPI — Aggregate news from thousands of sources

OpenWeatherMap — Weather data for any location

Mapbox — Beautiful, customizable maps

Google Maps API — The most comprehensive mapping platform

ipinfo.io — IP geolocation and ASN data

Auth0 — Enterprise-grade authentication

Clerk — Modern user management with pre-built components

Firebase Auth — Simple auth for mobile and web

GitHub API — Access repos, issues, and user data

Cloudinary — Image and video upload, transformation, and CDN

Vercel API — Programmatically manage deployments

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