Play contract knows that exchange contracts are commonly adopts the model of the order book, namely after you buy deity, need to buy, your opponent will list the order to clinch a deal, sold the same is true, this would require the exchange has enough depth, orders won't be able to realize real-time transaction, seriously affect the user experience at the same time, are likely to miss the most favorable prices,

BitOffer launched sustainable contract is different, it USES the top runs a single system, the depth of the cloud, no order book model, no matter how, you open the empty list or liquidated, can do a second deal, secondly it no money rate, namely we often say the management fee, as we know, the general exchange of sustainable contracts every 8 hours will have to pay a fee, should pay three times a day, it is a not small cost for the user, thus it can be seen that playing in BitOffer contracts more cost-effective, more economical, experience is better,