You can buy or sell WAVE by placing a limit or market order.

A limit order is a type of order to purchase or sell a security at a specified price or better. For buy limit orders, the order will be executed only at the limit price or a lower one, while for sell limit orders, the order will be executed only at the limit price or a higher one.

A market order is a buy or sell order to be executed immediately at the current market prices. As long as there are willing sellers and buyers, market orders are filled. Market orders are used when certainty of execution is a priority over the price of execution.

No, when purchasing via market order, you will get the average price of all orders. If your order is too big to fill the order for the smallest price, it will automatically continue the next bigger order. So there is the possibility to have different purchase prices for parts of your complete order.

In this case, your order will be shown as partially filled and the unfilled part will remain on the market as an open order.

There is a 0.45% fee charged per trade for the maker order and the taker order side.

Maker orders create (make) liquidity on a market by being entered onto the order book. In other words, maker orders are not filled when they are placed but instead wait until a future order is placed that matches them. A maker order can be on either the sell side or a buy side of the order. When an existing order on the order book is matched with a newly placed order (the taker), the maker order in the transaction is charged the maker fee.

Taker orders reduce (take away) liquidity on a market. Orders which execute immediately and take volume off the order book are takers. A taker order can be on either the sell side or buy side of the order. When a new order is placed and it matches against another order already on the order book (the maker), the taker in the transaction is charged the taker fee.

For the start there will only be the option to trade WAVE & BTC. The goal will is to transform the internal exchange to a decentralized exchange and to add around 10 more popular crypto currencies, which have high trading volume.