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If you paid it and the current balance now reflects $0.00 then I am sure you'll be fine closing it. Have you always been using the express option to make your payments? The regular payment may take 3-5 days to make the available credit go back up but it's sure a lot cheaper. Also please keep in mind that this card accrues interest as soon as a balance shows on your card from any charges or even the monthly maintenance fee. You should have paid the monthly fee as soon as you saw it plus any other charges you've put on the card immediately.
But all that doesn't matter if you're going to close it. Good riddance to that card. Unfortunately I just got mine 2 months ago and will keep it for up to 2 years. Hopefully this card has helped your credit out a lot since you've had it.
Glad you finally get to escape the Credit One shaftola :-D
You are closing the card with a $0 balance even though the last report shows $16. This is different from closing the card with a $16 balance (which many recommend against). Next time it reports it should show your zero balance and "CLOSED" if you close it today.
Enjoy saying goodbye to Credit One and enjoying your prime cards!