Short version:
The card automatically selects the payment method based on the current Bitcoin exchange rate: Below your cost-average price, you pay in euros, above that with Bitcoin — this is how you avoid losses and realize profits.
How it works:
The card automatically downloads payments depending on the current Bitcoin rate compared to your personal cost-average price (average purchase price of your bitcoins):
If the Bitcoin price is below your cost-average price:
Payment is made from your euro balance.
(This is how you avoid losses as you don't spend Bitcoins below their purchase price.)
If the Bitcoin rate is equal to or higher than your cost-average price:
Payment is made in Bitcoin.
(This is where you make a profit because you use bitcoins at a higher value than your purchase price.)
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