20+ Free APIs Every Developer Needs in 2026 — No Auth Required

You know the drill. You need a quick API for your side project — QR codes, currency rates, screenshot capture — and you end up wrestling with OAuth flows, billing dashboards, and 47-page docs before you can make a single request. I built a collection of 24 lightweight APIs running on Cloudflare Workers' edge network. They all share the same philosophy: No authentication required for the free tier 500 requests/month free (some endpoints offer 100/mo) Sub-50ms response times via 300+ global edge locations Zero cold starts — no containers, no lambdas, no waiting Every API below is available on RapidAPI. Let me walk you through the highlights. 1. QR Code Generator API Generate QR codes in PNG, SVG, or Base64 with custom colors and error correction levels. curl "https://YOUR_RAPIDAPI_HOST/generate?text=https://example.com&size=300&format=png&color=000000&bgcolor=FFFFFF" import requests response = requests . get ( " https://YOUR_RAPIDAPI_HOST/generate " , params = { " text " : " https://exam