Prefunded order
There will be no upfront fee for placing a prefunded order. Sellers send the respective amount of Mastercoins to the escrow address and buyers can purchase Mastercoins directly from me. Changes to an existing prefunded offer are free of charge.
After a completed sale, a 1% fee will be applied to both the MSC and the BTC amount. Should the seller want to cancel a prefunded order and request the Mastercoins back a 1% fee will be taken off the Mastercoin amount.

Note that holding Mastercoins in escrow is quite different from holding Bitcoins in escrow. Bitcoin is well established and by taking certain precautions I can minimize the risk of losing someone's Bitcoins. Mastercoin on the other hand is an evolving protocol and I've already seen a couple of transactions that were open to interpretation. I will of course do my best but I have to stress that I can't take on any responsibility for Mastercoins held in escrow for prefunded orders.