Well, I am around today, but I won't be for a few hours. I'm busy from 2:30 until 7:00-ish, possibly earlier (my time), but I'll be free after that. Tuesday won't work for me, I only have access to the internet on the weekends (my 3DS can't connect to my school's network).
I might not be able to make it today; it depends on how much work I can get done today. I could do the trades if you're on at exactly 12 (your time), but otherwise, I may be able to come online later, though not before 3.