IEX Cloud (Discontinued) 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 3 of 6 comparison axes.
Side-by-Side Comparison
| Feature | IEX Cloud (Discontinued) | Polygon.io (now Massive) |
|---|---|---|
| API Quality | 3/5 | 4/5 ✓ |
| Doc Quality | 3/5 | 4/5 ✓ |
| Free Tier | No | Yes ✓ |
| Affiliate Program | No | No |
| Data Latency | second | tick |
| SDK Languages | 5 languages | 5 languages |
| Asset Coverage | US Equities, US Options, Crypto, Forex, Commodities | US Equities, US Options, Forex, Crypto, Global Indices |
| Historical Depth | Service discontinued | 2003–present (equities) |
| Starting Price | N/A | $0/mo |
| Rate Limits | Service discontinued | Free: 5/min; Starter: 15/min; Developer+: unlimited |
IEX Cloud (Discontinued): Best For
- Historical reference only
Not Ideal For
- Any new project — service is shut down
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
More Comparisons
IEX Cloud (Discontinued) vs Databento Polygon.io (now Massive) vs Databento IEX Cloud (Discontinued) vs Alpaca Polygon.io (now Massive) vs Alpaca IEX Cloud (Discontinued) vs Finnhub Polygon.io (now Massive) vs Finnhub IEX Cloud (Discontinued) vs Alpha Vantage Polygon.io (now Massive) vs Alpha Vantage IEX Cloud (Discontinued) vs Twelve Data Polygon.io (now Massive) vs Twelve Data IEX Cloud (Discontinued) vs EOD Historical Data Polygon.io (now Massive) vs EOD Historical Data