That could be seen as a bad business idea, and when someone asks the OP why do that? And are you really serious about combining payments with the service's cryptocurrency, and what do you think the user will accept or even know about crypto?

And more importantly, if you don't want to get into the trouble of duplicating ideas and brands, imagine a series of memecoins created with meaningless content as well as names that really just want to chase the hype spread in the media. It's similar to how you mentioned branding in relation to a market that's generating traction. Seriously looking at the problem and its results in terms of challenges and risks when applied will help you figure out what to do next.