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...The next goal I think is to allow users to enter their own trade amount instead of the system given options. What do you think?
Hmm this though will be a great addition with the minimum being 3 matic which is good for now base on the price for a Matic.
Sorry for the late response just saw this now.
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...If they reach a certain level of popularity, I'm sure more platforms will come out that are very similar to Bitwinup.
Yes this is definitely true especially if they becomes a well-known name in bitcointalk, they will be having so much influence and aspirations to similar platforms