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Alex Spinov
Alex Spinov

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7 APIs That Give You Data Worth Thousands — Completely Free

#webdev #api #beginners #productivity

Most developers don't realize how much valuable data is available through free APIs. I'm not talking about toy APIs that return random cat facts.

I'm talking about APIs that companies pay thousands of dollars to access — but have free tiers generous enough for indie projects, research, and MVPs.

Here are 7 that changed how I build products.

1. OpenFDA — Drug & Medical Device Data

What: Every FDA drug approval, adverse event, recall, and medical device report since 2004.

Why it's valuable: Pharma companies pay $50K+ for market intelligence databases. OpenFDA gives you the raw data for free.

# Get adverse events for a specific drug
curl 'https://api.fda.gov/drug/event.json?search=patient.drug.openfda.brand_name:aspirin&limit=5'
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Free tier: 240 requests/minute, 120K/day. No API key needed.

Build idea: Drug interaction checker, adverse event dashboard, clinical research tool.

2. USGS Earthquake API — Real-Time Seismic Data

What: Every earthquake worldwide, updated every minute. Magnitude, depth, location, tsunami alerts.

# All earthquakes in the last hour
curl 'https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_hour.geojson'
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Free tier: Unlimited. No key needed.

Build idea: Earthquake alert bot, seismic data visualization, insurance risk calculator.

3. SEC EDGAR — Public Company Filings

What: Every SEC filing from every public US company. 10-K, 10-Q, insider trading, institutional holdings.

Why it's valuable: Bloomberg Terminal costs $24K/year. EDGAR has the same raw data.

# Apple's recent filings
curl -H 'User-Agent: MyApp contact@email.com' \
  'https://efts.sec.gov/LATEST/search-index?q=AAPL&dateRange=custom&startdt=2026-01-01'
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Free tier: 10 requests/second. Just need a User-Agent header.

Build idea: Earnings analyzer, insider trading tracker, competitive intelligence tool.

4. OpenWeatherMap — Historical + Forecast Weather

What: Current weather, 5-day forecast, historical data, air quality, UV index.

Why it's valuable: Weather data drives $600B in economic decisions annually.

import httpx

r = httpx.get('https://api.openweathermap.org/data/2.5/weather', params={
    'q': 'London',
    'appid': 'YOUR_FREE_KEY',
    'units': 'metric'
})
print(f"London: {r.json()['main']['temp']}°C")
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Free tier: 1,000 calls/day, 60 calls/minute.

Build idea: Delivery route optimizer, event planning tool, agriculture dashboard.

5. Eurostat — European Economic Statistics

What: GDP, employment, trade, population, energy — for all EU countries. Updated monthly.

curl 'https://ec.europa.eu/eurostat/api/dissemination/statistics/1.0/data/nama_10_gdp?geo=DE&time=2025'
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Free tier: Unlimited. No key.

Build idea: Economic comparison tool, investment research dashboard, policy analysis.

6. NASA APIs — Satellite Imagery & Space Data

What: Mars rover photos, asteroid tracking, Earth satellite imagery, solar flares.

# Astronomy Picture of the Day
r = httpx.get('https://api.nasa.gov/planetary/apod', params={
    'api_key': 'DEMO_KEY'
})
print(r.json()['title'], r.json()['url'])
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Free tier: 1,000 requests/hour with free API key.

Build idea: Asteroid tracker, satellite imagery analysis, space weather alerts.

7. World Bank Open Data — Global Development Indicators

What: 16,000+ development indicators for 200+ countries. Poverty, education, health, infrastructure.

# GDP per capita for all countries
curl 'https://api.worldbank.org/v2/country/all/indicator/NY.GDP.PCAP.CD?format=json&date=2024'
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Free tier: Unlimited. No key.

Build idea: Country comparison tool, development gap analyzer, NGO impact dashboard.

The Pattern

Notice something? The most valuable APIs are from government agencies and international organizations. They're funded by taxpayers and mandated to share data.

Meanwhile, private APIs charge $500/month for data that's often derived from these free sources.

How I Use These

I've built tools that combine multiple free APIs into useful products:

The trick isn't finding the data. It's combining data from multiple sources into something people will pay for.

Which free API has been most valuable for your projects? I bet there are some I'm missing. 👇

More API resources: github.com/Spinov001 — 190+ repos

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