OANDA vs Polygon.io (now Massive)
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 | OANDA | Polygon.io (now Massive) |
|---|---|---|
| API Quality | 4/5 | 4/5 |
| Doc Quality | 4/5 | 4/5 |
| Data Latency | tick | tick |
| SDK Languages | 3 languages | 5 languages ✓ |
| Free Tier | Yes | Yes |
| Affiliate Program | Yes | No |
| Asset Coverage Breadth | 4 asset classes | 5 asset classes ✓ |
| Asset Coverage | Forex, CFDs, Commodities, Indices | US Equities, US Options, Forex, Crypto, Global Indices |
| Historical Depth | 2001–present (FX tick and candle) | 2003–present (equities) |
| Starting Price | $0 | $0/mo |
| Rate Limits | 120 req/sec on REST; no stated limit on streaming | Free: 5/min; Starter: 15/min; Developer+: unlimited |
OANDA: Best For
- Forex algo traders
- FX backtesting (deep history)
- CFD automation
- EA developers
Not Ideal For
- Equities data
- Crypto beyond CFDs
- Non-FX asset classes
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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