XM does not sell Bitcoin or any other Cryptocurrencies.
XM currently does not offer “Crypto Exchange” service, but only “Margin Trading” of Bitcoin(BTCUSD) is available. (September 2017)
Bitcoin(BTCUSD) is available on XM MetaTrader5 live accounts. It is now available with other over 300 financial instruments including FX pairs, Stocks, Commodities, Metals, Energies, Indices and more.
XM MT4 does not offer Bitcoin yet, but all XM MT4 account holders can open MT5 account to trade Bitcoin at anytime.
If you wish to buy(acquire) Bitcoin or other Cryptocurrencies, please find Crypto Exchange from here.