Several currencies, one number
You bill in dollars, spend in euros and hold crypto that is neither. Fider consolidates it in your base currency.
Each transaction in its own currency
You convert nothing when logging. Fider keeps the original amount and converts at consolidation time.
Rates with a timestamp
The exchange rate used carries its time too, exactly like asset prices.
Change your base currency anytime
Move country or change market, switch the base currency and everything recomputes.