Nearly certainly everything would nominally be in fiat and at the time you pay in crypto, they would credit you the value of the crypto at the time of payment.

Nearly certainly everything would nominally be in fiat and at the time you pay in crypto, they would credit you the value of the crypto at the time of payment. I can't imagine they're going to go through the effort and risk of effectively hedging their crypto risk through securities markets, which would come at a premium.