>>60521548
I think JMB allows credit card purchases (with Amex)
so the only question is if coinbase is specifically blocking the SIC or merchant ID, IIRC there's also a block on buying gold on Amex within the first 6 months as well but I remember buying gold on ebay with it on month 2 or 3 before ebay banned Amex so they have to disallow by SIC/MID
I guess this is a whale card, $0 on first $500/mo is kind of ridiculous, even with the additional protections of Amex. I'm wondering if there is a rotating awards list though, that might make it worth it depending on which companies they include