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Right now it doesn't use segwit. We do have plans on setting up an LN node but haven't done so yet.

Segwit would make fees cheaper to use so i recommend you make that one of your priorities.

It is but we're still over 10x cheaper than any other gateway on BTS and any centralized exchange I know about and we've got our dev team maxed out at the moment. We will get to it as soon as we don't have as many things on our plate.