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. While there’s no minimum on subsequent deposits, deposits of less than $30 or equivalent incur a $3 transaction fee.