The $0 Plan Will Cost You More Than the $50 One
Most developers pick a free stock data API, hit the rate limit after two weeks, then panic-migrate to a paid tier mid-production. I've watched this happen four times in the last year — always with the same shocked realization: the "free" plan was bleeding money through engineer time, retry logic, and half-baked caching.
Here's the math nobody shows you upfront. A free API with 5 requests/minute sounds fine until you're polling 20 tickers every 10 seconds. That's 120 requests/minute. You'll burn through rate limits in 25 seconds, then spend three days building a priority queue, debounce system, and Redis cache just to stay under quota. Meanwhile, a $50/month plan with 100K requests would've handled it out of the box.
This post compares five stock data APIs — yfinance, Alpha Vantage, Polygon, Marketstack, and Finnhub — at three usage tiers: 10K, 100K, and 1M monthly requests. I'll show you the actual dollar cost, hidden fees, and engineering overhead at each level. The winner depends entirely on your request pattern, but the free tier is almost never the cheapest option when you factor in your time.
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