Hello, and welcome,
The current set of features is that you can only buy and sell US equities. You can import any comma-delimited time series that you wish using Fetcher, and then use that data as a trading signal on the US equities. That means you can import European prices as a signal, but, unfortunately, you can't buy and sell them yet within the backtester or within live trading.
I don't have a date for when European equities will be available. There is a lot of work left in extending our US equities features before we get to other instruments. Many months, at least.
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