Question: How much is the cost/fee for currency exchange/conversion by XM?
There is no fee charged by XM when converting a currency to another.
For example, if your account currency is GBP and you deposit in USD, when the fund is arrived to XM, XM will convert the USD to GBP and reflect the amount to the account.
The process will be done by the corresponding banks or the bank used by XM.
This is the same for when transferring funds internally between accounts.
The exchange rate is not the same as the ones in XM MT4/MT5.
If you like to know the exchange rate of the day, you may contact XM support team.