I think that Xapo is the best online wallet there is for the payments without any fee's these days, I think that these wallets without any fee's are mostly bad secured.
I agree and highly recommend Xapo. I'm using it over a month now and never had any issues. And it's not just wallet, they offer other services like vault and their debit card. I have it and it makes using Bitcoin much more easy and convenient. You should try it.
Besides xapo online wallet coinbase also without fee when we send bitcoin to all wallet. I use both for save my bitcoin. Vault i use for big amount