Niffler, An out-of-the-box open sourced Grin GUI Wallet

At the moment, it seems that you can withdraw Grin from Poloniex to Niffler wallet but not go in the other direction i.e. not send Grin from Niffler to Poloniex. Some said Polo. have not updated to latest Grin version. Hopefully they will after fork. See this thread for more details: