Yes, if the online casino supports M-Pesa as a withdrawal option, you can cash out your winnings through the channel. Casinos with M-Pesa withdrawal will usually have different limits, ranging from a low of up to Ksh30,000 between 6:01 am to 11:59 pm and a maximum of Ksh300,000 for withdrawals between midnight - 6 am. The best way to know the limits is by contacting the support team for help.