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VisualHFT's answer:
VisualHFT stands out due to its advanced real-time market visualization, particularly its detailed Level 3 order book data visualization. It offers microsecond precision in market analytics, robust algorithmic trading performance monitoring, and comprehensive infrastructure performance insights, all within a user-friendly interface.
Fixer.io - Fixer provides a free, simple, and lightweight API for current and historical foreign exchange rates and currency conversion. The API tracks rates published daily by the European Central Bank.
Quandl - Financial Data API - Financial Services
exchangeratesapi.io - Foreign exchange rates API with currency conversion.
TradingView - The best charting tool for crypto and stocks
xChangeApi - Easy to use, free live updated foreign exchange rates API
Alpaca Trading API - Simple REST API for commission-free stock trading