I have just purchased an OnlyKey and waiting for it to arrive. In the mean time I wanted to purchase an USB to Lightning OTG adapter to be able to use it with my iPhone. I found one on Amazon that is MFI certified and is USB 3 (blue USB-A connector). Does OnlyKey work in USB 3 ports/cables?
Yes, we also offer lightning to USB adapters on https://onlykey.io
It looks like you could also get a lower price at our store than the link you provided on Amazon.nl