usagegate

UsageGate checks every request. You choose what each subscription includes. UsageGate checks every request against that.

Sign up, name the plan you sell, and say what it includes: AI credits, exports, seats. Then put the check in the Next.js route. A request over the plan is blocked.

Stripe charges them. UsageGate decides if the request runs. If you use another payment gateway, you report the subscription yourself.

https://www.usagegate.io