As user I would like o convert my preferred currency (CPC) before the purchase to minimise the FX rate (less than 3%). So that, I can get better FX rate when I am abroad.
Similar existing product/feature:
How does this save you money?
With mondo (and revolut) you get the mid exchange rate. So unless you know which way the rate is going to move (and if you do, please let me know and we can both make a fortune), you are taking a gamble and could win or lose on the exchange.