https://snaptrade.com/
Connect to brokerage accounts for data and trading | SnapTrade
Connect your app to 400M+ retail investor accounts with one API. SnapTrade is the unified trading API for real-time portfolio data, trading, and aggregation.
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https://www.sierrachart.com/index.php?page=doc/SupportedDataAndTradingServices.php
Supported Data and Trading Services - Sierra Chart
Sierra Chart is a professional Trading platform for the financial markets. Supporting Manual, Automated and Simulated Trading.
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https://www.barchart.com/
Barchart | Market Data, News, Trading Tools, and Analysis
Barchart is the leading provider of real-time stock and commodities data. Keep tabs on your portfolio with screeners, customizable charts and analysis.
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