Alpha Vantage vs Massive (Polygon)
Verdict: Alpha Vantage: free key: 25 requests/day for most endpoints. Massive (Polygon): free tier: end-of-day data, 5 req/min, no card. Safety score: Alpha Vantage 90%, Massive (Polygon) 90%. They differ on assets, pricing, rate limits; the table below shows each fact with its source.
| Field | Alpha Vantage API | Massive (Polygon) API |
|---|---|---|
| Category | Market data APIs | Market data APIs |
| Assets | stocks, ETFs, mutual funds, indices, options, forex, commodities, economic indicators, news & sentiment | stocks, options, indices, forex, futures |
| Live vs paper | data only | data only |
| Order approval / safety | n/a | n/a |
| Pricing / free tier | free key: 25 requests/day for most endpoints; premium $49.99/mo (75 req/min) to $249.99/mo (1,200 req/min) | free tier: end-of-day data, 5 req/min, no card; Stocks Starter $29/mo (15-min delayed, includes full-market snapshot); Developer $79/mo (15-min delayed); Advanced $199/mo (real-time) |
| Rate limits | free 25 requests/day; premium 75–1,200 requests/min | free: 5 API calls/min; paid plans: unlimited API calls |
| Official / community | official | official |
| Last checked | 2026-11-09 | 2026-11-09 |
| Source | www.alphavantage.co | massive.com |
| Website | Visit Alpha Vantage API | Visit Massive (Polygon) API |
Both are listed under Market data APIs, where every tool in the category is shown with the same sourced facts.
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