Yes they are real. IBs simply share their rewards from a broker with you. Typically FX brokers reward 10 bucks per one standard lot traded and IB shares some of this amount with you, like 5,6, 7 bucks. So you get fixed-commission rebate. For example I use cash backforex with Hotforex and Tickmill they typically return 70% of their commissions which is pretty high.
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