#bjinwright
sage viper
grim bison
Good question on both of them. I am less sure on #1 as that is more of a business decision, I don't think there is one answer to that, depends on your business model, operating costs in each country, etc.
Looking up how to see the currency conversion rates.
So it looks like you can't really look up the conversion rate from us directly before taking a payment or sending funds. You can look up what the rate was after the fact with a call to retrieve the related balance transaction though
https://stripe.com/docs/currencies/conversions#foreign-exchange-rates
https://stripe.com/docs/api/balance_transactions/object#balance_transaction_object-exchange_rate