Yes, as tools that support your own trading: risk management, trade confirmation, position sizing or chart analysis.
EAs may not place trades on their own or run fully or partly automated strategies (martingale or grid bots, public scalping bots such as gold scalpers).
You must be able to explain any tool you use, and share its settings if we ask.
More than 2,000 server requests per day counts as server spamming.
An undeclared or hidden EA can end the challenge. Not knowing these rules is not a reason for a refund.
Not sure about your EA? Ask support before you use it.