Too busy whipping up a soufflé to check your bank balance online? You can now ask Amazon's Echo devices to give you the info, thanks to a partnership with Capital One. You just need to say "Alexa, ask Capital One for my Quicksilver card balance" or "Alexa, ask Capital One to pay my credit card bill," for instance. The voice assistant can already turn on your lights, play Spotify music, get you an Uber and check election results. However, Capital One is the first credit card or banking service to work with the expanding family of devices, which are only sold in the US.