The default tip amount is 300 bits, but that amount can be changed by the tipper in settings: https://www.coinbase.com/settings. We need to make that more clear, thanks for the feedback.
The default is designed so that users think of the button as more of a “FB like” than making a payment like they’ve historically thought about making a payment online. We’re trying to reduce the mental transaction costs of micropayments that Nick Szabo has written a lot about. 10 cents is something you don’t have to think twice about– if you like the content, you will click the button and contribute to the creator. We think this is pretty powerful. but are definitely open to feedback.
