Maybe U can use data from tradingview.com ? (BTCUSD)
There is a lot of indicators

There is no API, so it will be vary slow.
Mayby U can buffer data from tradingview to your server and create API for QtBitcoinTrader ?

I'm just saying. I have no other ideas. In other cases, the computer must be run on at all times to collect and anayze data...