We now have a very nice staking online wallet/bank and Twitter tipbot from coinwallet.co! Here it is: https://www.coinwallet.co/en/currency/PIGGY
They also have a function where you can pay to e-mail addresses!
As coinwallet.co themselves tell users, please don’t keep all your PIGGY there if you have a lot. — Store the majority of your coins in your own Paper or Desktop PiggyBank, where you have direct control over the private keys.