No, we do not currently accept any direct payments using cryptocurrency, sorry about that.
However, our understanding is that people with personal PayPal accounts based in the US (excluding Hawaii) can use PayPal to pay with Bitcoin, Ethereum, Litecoin, and Bitcoin Cash. To see if this feature is available to you, choose the PayPal option when you are checking out your purchase on Leanpub.
Here is an article from PayPal on this topic: