EOD Historical Data vs Polygon.io (now Massive)
Head-to-head comparison of two trading data providers. Updated 2026-05-24.
Overall winner: Polygon.io (now Massive) — wins 2 of 6 comparison axes.
Side-by-Side Comparison
| Feature | EOD Historical Data | Polygon.io (now Massive) |
|---|---|---|
| API Quality | 4/5 | 4/5 |
| Doc Quality | 3/5 | 4/5 ✓ |
| Free Tier | Yes | Yes |
| Affiliate Program | Yes | No |
| Data Latency | minute | tick |
| SDK Languages | 4 languages | 5 languages ✓ |
| Asset Coverage | Global Equities, US Equities, Forex, Crypto, ETFs, Indices, Bonds | US Equities, US Options, Forex, Crypto, Global Indices |
| Historical Depth | 40+ years (daily equities); intraday 1-min from 2004 | 2003–present (equities) |
| Starting Price | $19.99/mo | $0/mo |
| Rate Limits | 100,000 req/day on All-In-One; WebSocket on All-World | Free: 5/min; Starter: 15/min; Developer+: unlimited |
EOD Historical Data: Best For
- Fundamental analysts
- Global backtesting
- Multi-exchange coverage
- Value/quant researchers
Not Ideal For
- US tick data / HFT
- Real-time streaming on budget plans
- Crypto depth
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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