# Margin Trading

In order to enter a trade, call `marginTrade` on the respective iToken contract. Let's say you want to trade RBTC against XUSD. You enter a BTC long position by sending either of these currencies to the iXUSD contract and a short position by sending either of them to the iRBTC contract. The process is depicted below.

<figure><img src="/files/7Iw1du8GNIYxUhyHNaIn" alt=""><figcaption><p>How to open long or short positions.</p></figcaption></figure>


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