Please be very careful with this.
What they don't tell you is that your credit card issuer is going to treat the transaction as a cash advance and not a purchase which eliminates any buyer protections, they will probably charge a cash advance fee, and it will likely start accruing interest from transaction date. More importantly, the banks are getting really difficult about purchasing crypto with credit cards and there's a risk that they will close your account if they even allow the transaction in the first place.