If you enter a limit or stop order, but the order never actually executes, does IB charge you anything? And if a limit or stop is never hit...do you have to cancel it for a fee? Thanks.
It depends on what you're trading and how. Look at http://www.interactivebrokers.com/html/generalAccount/otherFees.html US Options, and Eurex options and futures have cancellation fees. There are per-message fees for use of the API (through your own program or some third-party addons) if you don't route using SMART.
Thanks, I meant plain orders of US equities not through API, which apparently don't have a charge. I couldn't find a reference on the site specifically saying there was no charge.