As explained in this article, the minimum deposit requirement depends on several factors:
If you are making your first deposit, you need to make a minimum deposit to activate the trading account. For example, if you would like to activate Advantage MT4 account, you will need to deposit a minimum of $/€/£ 500, ₦80,000*
Once you have activated the trading account, your subsequent deposits can be any amount or as needed for your trading.