FIX (Financial Information eXchange) is an open, industry-standard protocol for the electronic transmission of orders and related data. The protocol is defined and maintained by an industry association, the FIX Trading Community.
What is FIX?
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Is fractional trading available for the API?
What are the fees associated with fractional shares?
What is the commission structure with IBKR Lite?
Can I use the FIX CTCI with an IBKR Lite account?