Alpha Vantage vs Polygon.io (now Massive)
Head-to-head comparison of two trading data providers. Updated 2026-05-23.
Overall winner: Polygon.io (now Massive) — wins 2 of 6 comparison axes.
Side-by-Side Comparison
| Feature | Alpha Vantage | Polygon.io (now Massive) |
|---|---|---|
| API Quality | 3/5 | 4/5 ✓ |
| Doc Quality | 3/5 | 4/5 ✓ |
| Free Tier | Yes | Yes |
| Affiliate Program | No | No |
| Data Latency | minute | tick |
| SDK Languages | 5 languages | 5 languages |
| Asset Coverage | US Equities, Global Equities, Forex, Crypto, Commodities | US Equities, US Options, Forex, Crypto, Global Indices |
| Historical Depth | 20+ years (daily); intraday 1-2 months on free | 2003–present (equities) |
| Starting Price | $0/mo | $0/mo |
| Rate Limits | Free: 25/day; paid from 75/min | Free: 5/min; Starter: 15/min; Developer+: unlimited |
Alpha Vantage: Best For
- Beginners
- Homework / hobby projects
- Technical indicator data
- Fundamentals screening
Not Ideal For
- Production trading systems
- Real-time needs on free tier
- Tick data
Polygon.io (now Massive): Best For
- Algo traders
- Fintech app developers
- Options traders
- Crypto quants
Not Ideal For
- Tick-level HFT (DBZ format not available)
- Institutional order book depth
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