Balance on arrival names the remainder of a fee, paid when she arrives in cash, by card or in crypto, with every price stated in euro.
Most reservations on this site are paid in two instalments, and the second of them is the balance. It is settled at the very start, once the door has closed behind her, so none of the booked time afterwards has money in it.
For the ordinary reservation the balance is exactly half. A first booking with Jasmin for one hour splits down the middle: one half cleared as the deposit, and its twin is handed over in the room. A three-hour booking with Danielle works the same way on a larger fee: half went ahead, and the half still open falls due once the door closes.
For one kind of reservation the balance is the entire fee. A returning guest, asking for one or two hours with one woman on the same day, pays nothing beforehand and settles all of it on arrival, whether the booking runs sixty, ninety or a hundred and twenty minutes. That is the exception on this site rather than its habit, and as soon as a booking falls into one of the seven deposit classes the half comes back into the picture.
Three methods, and any of them suits any booking: cash, a card, or crypto. Every price is stated in euro, and the euro figure is what the booking costs. A guest who would rather pay in sterling, dollars or Swiss francs can do so, and the exact amount in that currency is confirmed in writing before she sets out. Cash settles the balance and only the balance; it never serves as a deposit, since a deposit is paid before she leaves. The two halves need not use the same method, and a guest who paid the deposit by card may well settle the balance in dollars.
Both figures appear in the written confirmation, so nobody does sums on the doorstep. The first half is defined under deposit, every rate sits in the table on each woman's profile, and questions about currencies are answered in the FAQ.