When live trading with IB account, is the data still minute-level price or realtime?
It is OHLCV minute bars for live trading (same as for backtesting). It is realtime, in the sense that the feed is available to the code every whole minute, a trading decision can be made, and then info. can be sent immediately (asynchronously) to IB, within the minute. Both orders and (I think) order cancellations are sent to IB as they are encountered in the code. However, the information flow from IB is on the whole minute (synchronous with the OHLCV bar feed).
Note that the data feed does not come from IB, but is some combination of bars derived realtime from Nanex Nxcore supplied trades and an undisclosed historical data source (see https://www.quantopian.com/posts/data-sources-backtesting-vs-live-trading).
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