7 APIs That Give You Data Worth Thousands — Completely Free

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' 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, d