We take 1% of risk funds each party gets back after both parties agree to release risk funds.
So, if you sell a cellphone for $100, and you risk 1 btc, and the buyer risks 2 btc. Upon both parties agreeing to release risk funds, you get back 0.99 btc, and buyer gets back 1.98 btc.
Also, note that bitcoin and litecoin transactions have a small transaction fee, so you will be paying those small transaction fees when you withdraw your funds from NASHX. This fee is currently at 0.0005 btc for bitcoin and 0.02 ltc for litecoin. This is not a fee charged by NASHX. This is a fee anybody sending bitcoin or litecoin has to pay to the bitcoin and litecoin miners who verify and process these transactions.