Polygon.io (now Massive) VS Twelve Data
Head-to-head market data API comparison.
UPDATED 2026-05-27 · 7 axes scored
WINNER · TWELVE DATA · 1/7 AXES
Quick Decision
▶ PICK POLYGON.IO (NOW MASSIVE) IF DATA-API
- Algo traders
- Fintech app developers
- Options traders
- Crypto quants
▶ PICK TWELVE DATA IF DATA-API
- Global coverage needs
- Technical indicator API
- Fintech apps
- Forex + crypto combo
Side-by-Side Matrix
| METRIC | POLYGON.IO (NOW MASSIVE) | TWELVE DATA |
|---|---|---|
| API Quality | 4/5 | 4/5 |
| Doc Quality | 4/5 | 4/5 |
| Data Latency | tick | second |
| SDK Languages | 5 languages | 5 languages |
| Free Tier | Yes | Yes |
| Affiliate Program | No | Yes |
| Asset Coverage Breadth | 5 classes | 6 classes |
| Asset Coverage | US Equities · US Options · Forex · Crypto · Global Indices | US Equities · Global Equities · Forex · Crypto · ETFs · Indices |
| Historical Depth | 2003–present (equities) | 30+ years (daily); intraday varies by plan |
| Starting Price | $0/mo | $0/mo |
| Rate Limits | Free: 5/min; Starter: 15/min; Developer+: unlimited | Credit-based; each endpoint consumes different credit amount |
Asset Class Coverage
Where the two providers overlap and where each has unique coverage.
| ASSET CLASS | POLYGON.IO (NOW MASSIVE) | TWELVE DATA |
|---|---|---|
| Crypto | ✓ Covered | ✓ Covered |
| ETFs | — | ✓ Covered |
| Forex | ✓ Covered | ✓ Covered |
| Global Equities | — | ✓ Covered |
| Global Indices | ✓ Covered | — |
| Indices | — | ✓ Covered |
| US Equities | ✓ Covered | ✓ Covered |
| US Options | ✓ Covered | — |
| TOTAL CLASSES | 5 | 6 |
Only Polygon.io (now Massive)
US Options · Global Indices
Only Twelve Data
Global Equities · ETFs · Indices
Shared · 3
US Equities · Forex · Crypto
Pricing Tier Map
Full tier ladder side-by-side · names and prices as published by each provider · 4 vs 4 tiers.
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
TWELVE DATA · 4 TIERS FREE TIER
01
Basic (Free) $0/mo
800 API credits/day, 8 WebSocket trial credits, 3 markets
02
Grow $79/mo
Real-time US stocks/commodities/fundamentals, 20+ markets ($66/mo annual)
03
Pro $229/mo
EU real-time, fixed income, mutual funds, 70+ markets ($191/mo annual)
04
Ultra $999/mo
99.95% SLA, dedicated support, 84 markets ($832/mo annual)
▲ Free Tier · Free: 800 API credits/day, 8 WebSocket connections
Technical Stack Fit
SDK languages and data formats determine integration cost for your existing codebase.
| DIMENSION | POLYGON.IO (NOW MASSIVE) | TWELVE DATA |
|---|---|---|
| API Types | REST · WebSocket · SDK | REST · WebSocket |
| SDK Languages | Python · JavaScript · Go · Kotlin · Swift | Python · JavaScript · Java · PHP · R |
| Data Formats | JSON | JSON · CSV |
| Rate Limits | Free: 5/min; Starter: 15/min; Developer+: unlimited | Credit-based; each endpoint consumes different credit amount |
| Latency Class | tick | second |
Fit Profile
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
TWELVE DATA · PROFILE DATA-API
Best For
- Global coverage needs
- Technical indicator API
- Fintech apps
- Forex + crypto combo
Not Ideal For
- Tick data / HFT
- Deep US options data
- Large bulk downloads
Full Twelve Data Review
Adjacent Comparisons
Related matchups — same category first, then cross-category for context.
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