TRADINGDATACOMPARE
LIVE · 2026-05-27

Best for
Fintech App Development.

Building consumer or B2B fintech apps that need reliable market data with generous free tiers.

Ranked · Top 5

#1
Polygon.io (now Massive) TOP PICK FREE TIER

Real-time and historical stock, options, forex, and crypto data — rebranded to Massive in 2026

FROM $0/mo API REST · WebSocket · SDK SDK Python · JavaScript · Go
REVIEW →
#2
Finnhub FREE TIER

Free real-time stock API with news, sentiment, and fundamentals

FROM $0/mo API REST · WebSocket SDK Python · JavaScript · Go
REVIEW →
#3
Twelve Data FREE TIER AFFILIATE

Global stocks, forex, and crypto API with built-in technical indicators

FROM $0/mo API REST · WebSocket SDK Python · JavaScript · Java
REVIEW →
#4

⚠️ Service shut down August 31, 2024 — no longer available

FROM N/A API REST · WebSocket · SDK SDK Python · JavaScript · Java
REVIEW →
#5
Alpha Vantage FREE TIER

Free stock API with technical indicators and fundamentals

FROM $0/mo API REST SDK Python · JavaScript · Java
REVIEW →

Cross-Reference

Polygon.io (now Massive) vs Finnhub Polygon.io (now Massive) vs Twelve Data Finnhub vs Twelve Data Finnhub vs IEX Cloud (Discontinued) Twelve Data vs IEX Cloud (Discontinued) Twelve Data vs Alpha Vantage IEX Cloud (Discontinued) vs Alpha Vantage

Other Use Cases

Best for Algo TradingBest for Crypto TradingBest for Forex TradingBest for BacktestingBest for Quant ResearchBest for BeginnersBest for Options TradingBest for Real-Time Market DataBest for Global EquitiesBest for Python DevelopersBest for JavaScript / Node.js DevelopersBest for Deep Historical DataBest for WebSocket StreamingBest for Free Tier OnlyBest for Budget Under $30/moBest for Institutional / EnterpriseBest for Active TradersBest for Options Trading (Brokers)Best for Global Multi-Asset BrokersBest for Brokers with API AccessBest for Prop Firms for BeginnersBest for Prop Firms for ForexBest for 1-Step Prop Firm ChallengesBest for Highest Prop Firm Profit Splits