JustForex has no deposit requirements for the Cent and Mini accounts. You can start trading with $1.
To open the Standard account, you need at least $100.
A minimum deposit for the ECN Zero account is $500. You can see how much money do you need to trade on Forex here.
JustForex offers leverage up to 1:3000, which gives traders an opportunity to invest great amount with small amount of original fund.