Polygon.io (now Massive) vs Tradier
Head-to-head market data API comparison. Updated 2026-05-24.
Overall winner: Polygon.io (now Massive) — wins 2 of 7 comparison axes.
Side-by-Side Comparison
| Feature | Polygon.io (now Massive) | Tradier |
|---|---|---|
| API Quality | 4/5 | 4/5 |
| Doc Quality | 4/5 | 4/5 |
| Data Latency | tick | second |
| SDK Languages | 5 languages ✓ | 3 languages |
| Free Tier | Yes | Yes |
| Affiliate Program | No | Yes |
| Asset Coverage Breadth | 5 asset classes ✓ | 3 asset classes |
| Asset Coverage | US Equities, US Options, Forex, Crypto, Global Indices | US Equities, US Options, ETFs |
| Historical Depth | 2003–present (equities) | 10+ years (daily OHLCV); 1-min intraday on paid |
| Starting Price | $0/mo | $0/mo |
| Rate Limits | Free: 5/min; Starter: 15/min; Developer+: unlimited | Generous; no published hard limits on Developer plan |
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
Tradier: Best For
- US options traders
- Retail algo traders
- Commission-free trading bots
- Options analytics apps
Not Ideal For
- International markets
- Crypto
- Futures
- Non-US exchanges
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