Two question about exchange Fee

[pc]

On BTS exchange (wallet.bitshares.org) it says: Fee: 6.8e-7
Is that in BTC (0.00027254075 BTC = 5,42 USD)?

See this for the fee schedule in BTS: https://bitshares.openledger.info/explorer/fees

Fees are always denominated in BTS. For convenience, it is possible to pay the fee in other assets as well, in that case the other asset is exchanged for the required amount of BTS behind the scenes, usually at a price that is slightly worse than the market price.

If I make an order, and it does not fill. Do I still have to pay the fee even the order is cancelled?

If you cancel an unfilled order, the fees for creating the order will be returned to your account (but to cancel the order you also have to pay a  fee - I believe it's 10% of the order creation fee).

[valtr]

The fee is in BTS NOT BTC and in not refundable.

[DAX]

On BTS exchange (wallet.bitshares.org) it says: Fee: 6.8e-7
Is that in BTC (0.00027254075 BTC = 5,42 USD)?

And,

If I make an order, and it does not fill. Do I still have to pay the fee even the order is cancelled?