Originally Posted by
friedablass
I'm not willing to be the guinea pig again

. I also saw on another thread that buying uber or lyft gcs via MPX triggered the rideshare credits on the United cards, so maybe there's a chance it also works for stubhub? The only difference is that with uber/lyft buying the gcs directly with them works too, the only reason to use MPX app is because of the lower $$ amount for the minimum gc purchase.
Definitely works for the rideshare credits, from personal experience. And not only the lower minimum, but you also get a few extra miles.
Looks like Stubhub via MPX is a $25 minimum (plus 3x miles). I don't think I'll have that much left of my credit this period, so hopefully some kind guinea pig will take a flyer for the common good.