For AI agents: a documentation index is available at the root level at /llms.txt. Append /llms.txt to any URL for a page-level index, or .md for the markdown version of any page.

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TWS Documentation TWS Reference Protobuf Reference Changelog

TWS Documentation TWS Reference Protobuf Reference Changelog

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Market Data: Historical Historical Bar whatToShow

FEE_RATE

|View as Markdown|Open in Claude|

Bar Values:

Open	High	Low	Close	Volume
Starting Fee Rate	Highest fee rate	Lowest fee rate	Last fee rate	N/A

Supported Products: Stocks, ETFs,

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