The minimum required funding for copying a trade is $500. Still, some signal providers may necessitate a higher minimum fee to enter due to the nature of their trading strategies.
Please keep in mind that there is a minimum lot size for forex markets of 0.01 however this can vary across instruments. It is also important to consider the size of the stop loss, as even on the minimum lots, a trade may use larger stops meaning it may require more funds in the account to support potential drawdowns. Maintaining appropriate risk management percentages may require more funds than the stipulated minimum balance depending on the trading strategy being copied.