Pindex is not "officially" listed on any exchanges yet. You can find them on etherdelta and forkdelta though.

Keep up to date in the telegram channel https://t.me/joinchat/Gk4o4Enf2HJxudEq-hXdpA

BE SURE TO READ THE PINNED UPDATE as well as scroll up and read a few lines before asking about "when/where exchange" (they'll let you know when it is "Officially" listed on an exchange.