Purchasing Nervos CKB directly with the US dollar may be possible in the future with a Coinbase listing. We are all patiently waiting. Until then you have many ways to purchase CKB. I have a couple of ways I do it. In this post, I will discuss how I purchase Nervos CKB with Coinbase and Convert it to CKB and deposit in any wallet of your choice that supports Nervos CKB. Examples include: Kukoin, Neuron Wallet, Metamask and imToken.
I used Changelly; great service to acquire CKB.