Polygon.io (now Massive)
Real-time and historical stock, options, forex, and crypto data — rebranded to Massive in 2026
Quick Facts
| Asset coverage | US Equities, US Options, Forex, Crypto, Global Indices |
| Historical depth | 2003–present (equities) |
| Data latency | tick |
| API types | REST, WebSocket, SDK |
| SDKs | Python, JavaScript, Go, Kotlin, Swift |
| Rate limits | Free: 5/min; Starter: 15/min; Developer+: unlimited |
| Data formats | JSON |
| Affiliate program | ✗ No |
| Last updated | 2026-05-24 |
Ratings
API quality ★★★★☆ 4/5
Doc quality ★★★★☆ 4/5
Community large
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
Pricing Plans
$0/mo
Free
EOD data, 5 calls/min
$29/mo
Starter
Real-time, 15 calls/min, 2y history
$79/mo
Developer
Unlimited calls, full history, WebSocket
$199/mo
Advanced
Options snapshots, higher limits
Free tier: Free tier: 5 API calls/min, EOD data only, no real-time