The article discusses the mechanism of foreign exchange through what so-called Forex teamster. The study concludes that trading, viewed from the aspect of goods exchanged, consists of three kinds, namely barter, buying and selling of goods with money, and money exchange. It is allowed to use broker's service in money exchange activity. It has been even a compulsory (wâjib ‘ayn) for a trader to select and chose a legal and trusteed broker in order to assure and secure his money. The reason is that a broker becomes not only wakîl (a trustee or an agent) of trader to proceed the transaction of the trader into the market, but also plays role as a responsible person who guarantees the trustiness of market over the trader. In other words, a broker has to make the market trusts every trader's transaction. The transaction has to cover all benefits and risks. It can be understood, therefore, that non-dealing desk broker is a person who meets the requirements of wakâlah and d}amân contacts implemented within Forex transaction.