The best hackathon projects use real data. Judges can tell when you hardcoded everything. These APIs are free, require no credit card, and work within hackathon timeframes.
AI & Machine Learning APIs
- OpenAI API – $5 free credit for new accounts. GPT-4o-mini is cheap enough for demos.
- Google Gemini API – Free tier: 15 requests/minute. Multimodal (text + image).
- Anthropic Claude API – Free credits via console.anthropic.com
- Hugging Face Inference – Free API for 200K+ open source models
- Groq – Free tier with blazing fast inference (Llama, Mixtral)
- Replicate – Free tier for image generation, video, audio models
Maps & Location
- Google Maps Platform – $200 free credit/month (enough for any hackathon)
- Mapbox – 50K map loads free/month
- OpenStreetMap/Nominatim – Completely free geocoding and maps
- Geoapify – 3,000 requests/day free (routing, places, geocoding)
Government & Public Data (India)
- data.gov.in – 4,000+ datasets: agriculture, health, transport, education
- Indian Census API – Population, demographics, literacy data
- Mandi Prices (eNAM) – Real-time crop market prices
- India Meteorological Dept – Weather data and forecasts
- ISRO Bhuvan – Satellite imagery and geospatial data
- DigiLocker API – Document verification (for SIH projects)
Weather & Environment
- OpenWeatherMap – 1,000 calls/day free. Current + forecast + historical.
- AQICN – Real-time air quality data for any city
- Open-Meteo – Completely free, no API key needed. Weather + climate data.
Finance & Crypto
- Alpha Vantage – 25 requests/day free. Stock prices + fundamentals.
- CoinGecko – Free crypto prices, market data, historical data.
- Razorpay Test Mode – Full payment integration for demos (no real money)
- RBI API – Exchange rates, monetary data
Communication
- Twilio – Free trial: SMS, voice, WhatsApp (limited but enough for demo)
- SendGrid – 100 emails/day free forever
- Telegram Bot API – Completely free, unlimited messages
- Discord API – Free, unlimited bot interactions
Media & Content
- Unsplash API – Free images (50 requests/hour)
- Pexels API – Free stock photos and videos
- News API – 100 requests/day free (headlines from any country)
- YouTube Data API – 10,000 units/day free
Utilities
- QR Code Generator API – goqr.me (unlimited, free)
- URL Shortener – TinyURL API (free, no auth)
- IP Geolocation – ip-api.com (free for non-commercial, perfect for hackathons)
- JSON Placeholder – Fake REST API for prototyping
How to Use APIs in Hackathons
- Sign up BEFORE the hackathon – API key approval can take hours
- Test API responses locally first – understand the data structure
- Cache responses – don’t hit rate limits during demo
- Have fallback data – if API goes down during demo, show cached results