PiggyCoin was added to the online staking wallet POSWallet.com! You can upload your PIGGYs and other proof-of-stake coins there and leave them working to make interest for you while you enjoy an iced truffle drink.
They also have a faucet (= free coins) and block explorer. Check them out!
Like an exchange, be careful about leaving many PIGGY there for a long period of time. The PIGGYs in your own PiggyBank are the only ones that you truly control.