Yes, there are Swaps charged for open positions of Bitcoin(BTCUSD) on XM MT5.
Swap Points may be charged or credited depending on the direction of your open positions. Swaps will be charged/credited at 00:00 in GMT+2(GMT+3 in summer time).
Swap rates of Bitcoin comes from the relevant interbank rate. Long positions are charged with the relevant interbank rate plus a mark-up and short positions receive the rate minus a mark-up.