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Some retails brokers such as Fidelity, Schwab and Robinhood do not provide APIs.

Are you referring to Richard W. Schabacker's "Stock Market Theory and Practice" and "Technical Analysis and Stock Market Profits"?

Are there books that explain trader behavior and the possible reasons behind market movements? I currently have "Trading and Exchanges: Market Microstructure for Practitioners" by Larry Harris. Are there other books you would recommend? It doesn't have be a book about market microstructure.

I am planning to learn about Al Brooks' trading methods. I noticed that he has published three books and also offers a trading course. Should I read the books, or should I do the trading course? If both, which one should I start with?

Where can I get real-time Level 2 quotes for US equity options? I prefer "display data" (data for humans to read on a screen), rather than a data feed/API. Related question: how does data dissemination for US equity options work? Does all option trade and quote information go through OPRA? Is...

Polygon's API for stocks (https://polygon.io/stocks) has websocket endpoints for real-time quotes and trades (see: https://polygon.io/sockets). Does Polygon's "real-time trades" websocket channel correspond to the "Time and Sales" that is commonly available on GUI trading platforms? Does...

How much does IB charge for the data and platform?

Is there an API feed for Level 2 (best bid, best ask, best bid volume, best ask volume for each exchange) and Time & Sales for US stocks? I'm currently able to work with delayed data, but I will eventually need real-time data. The API feed should preferably provide a little bit of historical...