Is graft available on Coinbase?

Excuse me, I'm a bit confused about something. I've been hearing a lot about cryptocurrency lately, and I'm specifically interested in Coinbase as a platform. Now, I've come across the term "graft" in relation to some other financial transactions, but I'm not sure if it applies to Coinbase as well. So, could you please clarify for me: is graft available or permitted on Coinbase? I'm just trying to make sure I'm fully informed before I start using the platform. Thank you for your help.