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There's already a few things like this IIRC. I can't recall them off the top of my head, but I have seen something like this around, where you scan a QR and tap "send" it then sends it (through the service) to the other account. All the transactions were handled "in-house" so there were no transaction fees (from regular bitcoin use). IIRC you could withdraw with bitcoin or USD. There's also that ATM in canada(?) that has gotten some pretty good use.