Finnhub VS Polygon.io (now Massive)
Head-to-head market data API comparison.
UPDATED 2026-05-23 · 7 axes scored
Quick Decision
▶ PICK FINNHUB IF DATA-API
- Indie developers
- Screener apps
- Sentiment / news analytics
- Global equities
▶ PICK POLYGON.IO (NOW MASSIVE) IF DATA-API
- Algo traders
- Fintech app developers
- Options traders
- Crypto quants
Side-by-Side Matrix
| METRIC | FINNHUB | POLYGON.IO (NOW MASSIVE) |
|---|---|---|
| API Quality | 4/5 | 4/5 |
| Doc Quality | 4/5 | 4/5 |
| Data Latency | second | tick |
| SDK Languages | 5 languages | 5 languages |
| Free Tier | Yes | Yes |
| Affiliate Program | No | No |
| Asset Coverage Breadth | 5 classes | 5 classes |
| Asset Coverage | US Equities · Global Equities · Forex · Crypto · ETFs | US Equities · US Options · Forex · Crypto · Global Indices |
| Historical Depth | 30+ years (daily); 1 year intraday on free | 2003–present (equities) |
| Starting Price | $0/mo | $0/mo |
| Rate Limits | Free: 60/min; paid: 300/min | Free: 5/min; Starter: 15/min; Developer+: unlimited |
Asset Class Coverage
Where the two providers overlap and where each has unique coverage.
| ASSET CLASS | FINNHUB | POLYGON.IO (NOW MASSIVE) |
|---|---|---|
| Crypto | ✓ Covered | ✓ Covered |
| ETFs | ✓ Covered | — |
| Forex | ✓ Covered | ✓ Covered |
| Global Equities | ✓ Covered | — |
| Global Indices | — | ✓ Covered |
| US Equities | ✓ Covered | ✓ Covered |
| US Options | — | ✓ Covered |
| TOTAL CLASSES | 5 | 5 |
Only Finnhub
Global Equities · ETFs
Only Polygon.io (now Massive)
US Options · Global Indices
Shared · 3
US Equities · Forex · Crypto
Pricing Tier Map
Full tier ladder side-by-side · names and prices as published by each provider · 2 vs 4 tiers.
FINNHUB · 2 TIERS FREE TIER
01
Free $0/mo
60 calls/min, real-time US + global quotes
02
All-In-One $50/mo
300 calls/min, premium datasets, financials
▲ Free Tier · Free: 60 API calls/min, real-time quotes, WebSocket trades
POLYGON.IO (NOW MASSIVE) · 4 TIERS FREE TIER
01
Stocks Basic $0/mo
EOD data, 5 calls/min
02
Stocks Starter $29/mo
15-min delayed data
03
Stocks Developer $79/mo
15-min delayed data, unlimited calls
04
Stocks Advanced $199/mo
Real-time data, WebSocket, full history
▲ Free Tier · Free tier (Stocks Basic): 5 API calls/min, EOD data only, no real-time
Technical Stack Fit
SDK languages and data formats determine integration cost for your existing codebase.
| DIMENSION | FINNHUB | POLYGON.IO (NOW MASSIVE) |
|---|---|---|
| API Types | REST · WebSocket | REST · WebSocket · SDK |
| SDK Languages | Python · JavaScript · Go · Ruby · PHP | Python · JavaScript · Go · Kotlin · Swift |
| Data Formats | JSON | JSON |
| Rate Limits | Free: 60/min; paid: 300/min | Free: 5/min; Starter: 15/min; Developer+: unlimited |
| Latency Class | second | tick |
Fit Profile
FINNHUB · PROFILE DATA-API
Best For
- Indie developers
- Screener apps
- Sentiment / news analytics
- Global equities
Not Ideal For
- Tick data / HFT
- Deep intraday history free tier
- Futures
Full Finnhub Review
POLYGON.IO (NOW MASSIVE) · PROFILE DATA-API
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
Full Polygon.io (now Massive) Review
Adjacent Comparisons
Related matchups — same category first, then cross-category for context.
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