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Alex Spinov
Alex Spinov

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7 APIs That Give You Real-Time Data for Free (No API Key Required)

#discuss #api #webdev #beginners

I spent the last 6 months building side projects with free APIs. Most "free API" lists are full of dead links and deprecated endpoints.

Here are 7 that actually work right now, return real-time data, and need zero authentication.

1. Open-Meteo — Weather for Any Location 

curl "https://api.open-meteo.com/v1/forecast?latitude=52.52&longitude=13.41&current_weather=true"
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Returns current temperature, wind speed, weather code. Covers the entire planet. Updates every 15 minutes.

Build idea: Weather widget for your portfolio site.

2. SpaceX API — Every Launch Since 2006 

curl https://api.spacexdata.com/v5/launches/next
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Next launch date, rocket type, payload info. Also has crew data, Starlink satellite positions, and landing pad stats.

Build idea: Launch countdown Slack bot.

3. CoinGecko — Crypto Prices 

curl "https://api.coingecko.com/api/v3/simple/price?ids=bitcoin,ethereum&vs_currencies=usd"
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Real-time prices for 10,000+ cryptocurrencies. No key needed for basic endpoints.

Build idea: Portfolio tracker CLI tool.

4. USGS Earthquake API — Seismic Activity Worldwide 

curl "https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/significant_month.geojson"
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Every significant earthquake in the last 30 days. Magnitude, location, depth, tsunami warning.

Build idea: Earthquake alert system for specific regions.

5. REST Countries — Every Country on Earth 

curl https://restcountries.com/v3.1/name/japan
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Population, languages, currencies, timezones, borders, flag URLs. 250 countries.

Build idea: Geography quiz game.

6. Open Notify — ISS Position Right Now 

curl http://api.open-notify.org/iss-now.json
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Latitude and longitude of the International Space Station, updated every second.

Build idea: "Is the ISS above me?" web app.

7. Wikipedia API — Any Article as JSON 

curl "https://en.wikipedia.org/api/rest_v1/page/summary/Python_(programming_language)"
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Title, extract, thumbnail, description. Works for any Wikipedia article in any language.

Build idea: Random fact generator.

The Pattern

All 7 APIs share these traits:

  • No API key or signup
  • HTTPS with JSON response
  • Stable (years of uptime)
  • Generous rate limits

I maintain 25+ Python clients for free APIs like these.

What real-time API do you use in your projects? I am building a collection and want to find ones I have missed.

Top comments (1)

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omega_alphatron_0101 profile image
Omega Alphatron •

These are awesome! 💡