Ive been using a coin base before but it doesn't get more efficiently I experience having an error every time I want to reload the widget right now I'm using a bitcoin ticker
They are using different third-party too, just scan the Terms and conditions of their application.
The reason I like this widget is they are supported different exchange too and the market volume, but the cons are I cannot resize those labels for example on the image below unlike the coinbase you can fit into your android phone.
Ps. Im not promoting them I just want to share my experience with this widget.