It’s a private plan called Custom-Unlimited. Maybe you can see it on the Pricing page?

Sorry i didnt receive any invite , where did you sent the invite ? its not in my mail !

I’ve just invited you to the private unlimited plan.

Hey! i would also like to know the plan for unlimited quota,

Mashape doesn’t want to let me create a public higher level plan, but I will invite you to a private unlimited plan.