Yes, users are free to use any indicator they wish as long as it is a trade or risk manager. Using any other third-party Expert Advisor is not allowed. This will lead to a closure of the account.
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If it's a custom EA that you created and you are willing to share the source code with us and explain the strategy then you may be eligible to use it.
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E8 does not limit or restrict a user’s trading style or strategy so long as (1) the user is simulating trades legitimately, (2) the user’s trades conform to real market conditions, and (3) E8 could replicate these trades in its live capital accounts if it wanted to do so.

It is important to note, that there is a Maximum Ticket Size for Forex & Commodities at 50 Lots per order and a Maximum Ticket Size for Indices at 100 Lots per order. There is also a limit of 100 orders you can enter at a time. Besides that users may simulate trades of all instruments and assets available in their hypothetical trading platform, as long as users manage risk appropriately and adhere to all User Objectives and Rules.
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While E8 permits users to use Expert Advisors (EAs), use of an EA must comply with E8 rules. Keep in mind that using a third-party Expert Advisor is allowed as long as it is a trade or risk manager. Using any other third-party Expert Advisor is not allowed. This will lead to a closure of the account.
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