You can still trade with $10 for instance, depending on the leverage you set in your account. 

Let’s say you have 500 leverage, you could buy 0.01 lots of XRPUSD at 1.12618 and the trade would cost $2.25. However, if you do the same with 100 leverage, it would cost $11.26. 

Keep in mind that you will be limited on the Instruments that you can trade since their contract sizes and lower leverages vary. Commodities and Indices have lower leverage so you would need more funds to open a position.