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Charles Schwab
Equities and options through Schwab's OAuth Trader API.
The API behind one of the largest US brokerages, covering equities, ETFs, and single- and multi-leg options.
Good to know
Schwab's OAuth tokens must be manually reauthorized roughly every 7 days — there's no long-lived refresh yet. The API reaches live accounts only; its sandbox is synthetic test data, not a real paper account. Futures, forex and crypto aren't available through this connection.