For questions related to HTTP/websocket API, client libraries of twelvedata.com service that provides stocks, ctypto, forex, indicies and ETFs realtime data
Twelve Data is a cloud financial data provider. Data might be sourced via API in JSON & CSV formats or streamed in real-time via WebSocket. Over 25+ years of historical data. Full support of the stock, forex, crypto, ETF, indices, and fundamentals data. All data is processable with 100+ technical indicators. SDKs and spreadsheet add-ins to access all API endpoints.