The curated directory of the best free REST APIs in 2026. Find, test, and integrate the right API for your project — no paywall, no BS.
Browse API Directory →Your sleep quality determines your cognitive performance. Use the calculator to find your optimal bedtime based on 90-minute sleep cycles.
Production-ready APIs with free tiers. Tested and verified.
Current weather, 5-day forecasts, and historical data for any location. 60 calls/min free tier.
View Docs →Real-time crypto prices, market data, and historical prices for 10,000+ coins. No API key needed.
Try It →Real-time news from 80,000+ sources worldwide. Filter by keyword, source, language, and date.
View Docs →Data for every country — flag, currency, language, population, borders. No auth required.
View Docs →Movies, TV shows, actors, posters, trailers. Powers thousands of apps. Generous free tier.
View Docs →Fake REST API for testing and prototyping. Posts, comments, users, todos — no setup needed.
Try It →Cognitive performance, focus, and code quality all depend on sleep. Here's the science.
Even 1.5 hours of sleep deprivation reduces alertness by 32%. Decision-making, memory consolidation, and creative problem solving all require proper sleep cycles.
Inhale for 4 counts. Hold for 7. Exhale for 8. Repeat 4 times. This activates the parasympathetic nervous system and reduces cortisol — proven to shorten sleep onset time.
Screens emit blue light that suppresses melatonin production for up to 3 hours. Use Night Shift / Night Mode 2 hours before bed, or get blue-light blocking glasses.
25 minutes of focused work + 5-minute rest × 4 = 1 Pomodoro cycle. After 4 cycles, take a 30-minute break. Prevents cognitive fatigue and decision paralysis.
Every free API worth knowing about, organized by category with real code examples.
Read →The science of REM and NREM sleep cycles — and how to engineer your schedule around them.
Read →Signs of burnout, recovery strategies, and how to build sustainable work habits as a developer.
Read →REST APIs, dev tools, and sleep science — weekly in your inbox.