Trading at Bullex always involves Currency pairs. These pairs are displayed as, for example 'ETH/BTC'. In such a pair the first currency is refered to as the Quote currency (in our example: 'ETH'), the second currency is refered to as the Base currency ('BTC' in our example).
Example: Suppose you hold a balance of 10 BTC at Bullex, and you want to use your BTC to buy ETH. In this case you should first select the trading page for the ETH/BTC pair. On this page you can put in your buy orders to trade your BTC against ETH.
Use the same pair for Buying and Selling
In our previous example you held a balance in Bitcoin (BTC) and you wanted to buy Ether (ETH). Now suppose it is the other way around: you hold an ETH balance and you want to buy BTC. In this example you should also select the trading page for the same ETH/BTC pair. Now you have to specify the amount of ETH you want to sell to acquire BTC.
No pair available?
In some cases there is no pair available for the trade you want to make. Suppose you hold a Zcash (ZEC) balance at Bullex, and you want to trade ZEC for DASH. Unfortunately we don't have a ZEC/DASH trading pair. In this case you will have to do two transactions. For example first you trade your ZEC for Bitcoin (BTC) using the ZEC/BTC pair. As a next step you can trade the Bitcoin for DASH using the DASH/BTC pair.
Displayed value of a currency pair
In a currency pair, the value of the base currency is displayed relative to the quote currency. The currency pair is priced in terms of the quote currency and the price indicates how much of the quote currency is required to buy one unit of the base currency.
For example, a price of 5600 EUR for BTC/EUR means that 5600 EUR is required to purchase 1 BTC. In currency pair trading on Bullex, a pair can effectively be a single trading instrument that is opened as a position by buying or selling the pair.