As a Coinapult user, you receive two free outgoing transactions (Coinapult pays all mining fees) per day. 

Additional outbound transactions will be charged a flat fee of 0.0008 BTC to help cover the recently increasing costs of the Bitcoin network's mining fees, up to 100 outgoing transactions per day.

If you do more than 100 outgoing transactions per day, you will pay the actual mining fee used for those additional transactions (i.e., Coinapult will not pay any of the mining fees).