http://invest5gh6ln6dom3z2rgtkbctdmpmcotyggb376jtbrfbqp6i2u36yd.onion/bitcoin-python/index15.html
Now, assume that you want to take a position in British pounds. If the exchange rate is £0.5 = $1, you will receive £7,500. After some time, the GBP/USD rate changes to 0.45, and you square off your position to get $1,666.65 in your trading account.