> For the complete documentation index, see [llms.txt](https://docs.eitherway.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.eitherway.ai/documentation/ecosystem-and-integrations/payments-state-and-runtime-infrastructure.md).

# Payments, State, and Runtime Infrastructure

A usable product needs more than a front end.

It also needs a runtime layer that can support sessions, payments, caching, persistence, and real-time behavior once users show up.

#### **Stripe** 

Stripe provides payment infrastructure for monetizable applications, including SaaS, subscriptions, and other business models built through Eitherway.

#### **Upstash** 

Upstash supports fast state handling, caching, queues, rate limiting, and real-time application behavior for products that need more than static generation.

This matters because a lot of products do not fail at the point of creation. They fail once real usage starts.