how much transaction fee btc
The fee is largely up to the bitcoin user to decide, but attacheding a very low, or zero fee to a transaction will tend to be ignored by miners and those transactions may never get confirmed. The typical transaction fee is around 0.0001 BTC, and with Bitcoin trading at around $610, that amounts to $0.061. Larger transactions (in terms of kilobytes) require higher fees. (For more, see: What is Bitcoin Mining?