Polygon.io (now Massive) vs Twelve Data
Head-to-head market data API comparison. Updated 2026-05-24.
Overall winner: Twelve Data — wins 1 of 7 comparison axes.
Side-by-Side Comparison
| Feature | Polygon.io (now Massive) | Twelve Data |
|---|---|---|
| API Quality | 4/5 | 4/5 |
| Doc Quality | 4/5 | 4/5 |
| Data Latency | tick | second |
| SDK Languages | 5 languages | 5 languages |
| Free Tier | Yes | Yes |
| Affiliate Program | No | Yes |
| Asset Coverage Breadth | 5 asset classes | 6 asset classes ✓ |
| Asset Coverage | US Equities, US Options, Forex, Crypto, Global Indices | US Equities, Global Equities, Forex, Crypto, ETFs, Indices |
| Historical Depth | 2003–present (equities) | 30+ years (daily); intraday varies by plan |
| Starting Price | $0/mo | $0/mo |
| Rate Limits | Free: 5/min; Starter: 15/min; Developer+: unlimited | Credit-based; each endpoint consumes different credit amount |
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
Twelve Data: Best For
- Global coverage needs
- Technical indicator API
- Fintech apps
- Forex + crypto combo
Not Ideal For
- Tick data / HFT
- Deep US options data
- Large bulk downloads
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