Mars would be communal at first, so no currencies necessary. Once you get different communities spread out that produce different (excess) goods and services, then you would need trade. I'd wager that trade would be barter at first, and eventually move to a currency if its feasible.
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It might start out as communal but I think once they start producing goods and services, in my opinion, they will directly shift to something like a cryptocurrency. By then, it will have been a proven model and very easy to implement (like plug and play).