The main thing is to find a balance between the size of the deposit and the risks. Yes, in theory you can trade with a small capital, but with a big leverage the risks will be very big. For example, in ForexChief you can take a leverage of 1:1000. Then with a deposit of 10-20 dollars you can open many deals, but the risks will be very high. It is therefore important to find a balance between risk and the size of the deposit.