> ## Documentation Index
> Fetch the complete documentation index at: https://docs.solvapay.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Add a paywall to an API or app

> Use the SolvaPay TypeScript SDK to add paywall checks to APIs, apps, and MCP tools with full customization.

Use this guide when you want full control and plan to integrate monetization directly in your codebase.

## Who this is for

* Teams building APIs, web apps, or custom MCP flows
* Teams that need custom auth, routing, or entitlement behavior
* Teams that want code-level control over monetization

## What you will achieve

By the end, your API or app enforces plan access with the SolvaPay TypeScript SDK.

## Prerequisites

* A SolvaPay account
* A product and plan in the SolvaPay Console
* A TypeScript project (Node.js, Next.js, Express, or MCP server)

## Steps

1. Run [CLI setup](/sdks/typescript/setup/cli) or [installation](/sdks/typescript/setup/installation).
2. Complete [SDK quick start](/sdks/typescript/setup/quick-start).
3. Choose the framework guide you need:
   * [Express](/sdks/typescript/guides/express)
   * [Next.js](/sdks/typescript/guides/nextjs)
   * [MCP](/sdks/typescript/guides/mcp)
4. Configure auth using [custom auth](/sdks/typescript/guides/custom-auth) if needed.
5. Add usage billing with [usage events](/sdks/typescript/guides/usage-events) where required.

## Verify

* Protected endpoints or tools return paywall responses for missing purchases
* Valid purchases pass and execute business logic
* Usage appears in sandbox data

## Next related tasks

* [Add inline chat checkout with React](/guides/add-inline-chat-checkout-react)
* [Handle webhooks](/guides/handle-webhooks)