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

# Introduction

> Welcome to CheapPay - the HTTP-native payment protocol that transforms your APIs, AI services, and data feeds into instant revenue streams using Solana blockchain. Get started with micropayments in just one line of middleware.

## 🚀 Transform Any API Into Revenue

CheapPay brings Coinbase's x402 payment protocol to Solana, enabling developers to monetize APIs, AI services, and digital content with **micropayments starting at \$0.001**. Built for the Solana ecosystem with USDC/SOL support and seamless wallet integration.

<Card title="Quick Start Guide" icon="rocket" horizontal href="/quickstart">
  Get your payment-enabled API running in under 5 minutes with our three-step
  guide.
</Card>

## Why Choose CheapPay?

**The Problem**: Traditional payment systems require complex backends, user accounts, and have high minimum payments. Existing crypto solutions are built for e-commerce, not APIs.

**Our Solution**: HTTP-native payments using 402 status codes. Your users pay with crypto they already hold, no signups required.

<Columns cols={2}>
  <Card title="AI & Data APIs" icon="brain" href="/use-cases/ai-apis">
    Perfect for AI completions, image generation, real-time data feeds, and B2B
    analytics APIs with instant micropayments.
  </Card>

  <Card title="Content Paywalls" icon="lock" href="/use-cases/content">
    Monetize premium articles, videos, or digital content with instant crypto
    payments and zero friction.
  </Card>

  <Card title="Micro-services" icon="cubes" href="/use-cases/microservices">
    Each service component can monetize independently without complex billing
    systems or backends.
  </Card>

  <Card title="Enterprise Ready" icon="building" href="/use-cases/enterprise">
    Easy integration into existing systems with TypeScript support and
    comprehensive documentation.
  </Card>
</Columns>

## Start Building

Get your payment infrastructure running with minimal setup.

<Columns cols={2}>
  <Card title="Express.js Integration" icon="code" href="/integrations/express">
    Add payment middleware to your Express API with one line of code.
  </Card>

  <Card title="Next.js Middleware" icon="next" href="/integrations/nextjs">
    Protect your Next.js API routes with built-in payment verification.
  </Card>

  <Card title="Hono Framework" icon="zap" href="/integrations/hono">
    Lightning-fast payments for edge computing and serverless APIs.
  </Card>

  <Card title="Custom Integration" icon="puzzle-piece" href="/integrations/custom">
    Build your own integration using our TypeScript SDK and HTTP protocol.
  </Card>
</Columns>

## Core Features

Everything you need for production-ready cryptocurrency payments.

<Columns cols={2}>
  <Card title="Solana Native" icon="blockchain" href="/features/solana">
    Built specifically for Solana with USDC, SOL, and custom SPL token support.
  </Card>

  <Card title="Multi-Wallet Support" icon="wallet" href="/features/wallets">
    Works with Phantom, Solflare, Backpack, and all major Solana wallets.
  </Card>

  <Card title="Zero Backend" icon="server" href="/features/architecture">
    No complex payment infrastructure needed - just add middleware and start
    earning.
  </Card>

  <Card title="Instant Settlements" icon="lightning" href="/features/settlements">
    Payments settle on-chain in seconds with automatic verification.
  </Card>
</Columns>

## Developer Experience

Tools and resources to help you succeed.

<Columns cols={2}>
  <Card title="TypeScript SDK" icon="typescript" href="/sdk/typescript">
    Fully typed SDK with intelligent autocompletion and error handling.
  </Card>

  <Card title="Live Examples" icon="play" href="/examples">
    Working code examples for AI APIs, content paywalls, and data services.
  </Card>

  <Card title="Testing Tools" icon="flask" href="/testing">
    Comprehensive testing suite with devnet support and mock payments.
  </Card>

  <Card title="API Reference" icon="book" href="/api-reference">
    Complete API documentation with request/response examples.
  </Card>
</Columns>

## Ready to Monetize?

Join the growing ecosystem of developers earning with CheapPay.

<Card title="See Live Implementations" icon="stars" href="/showcase">
  Browse real-world examples of AI services, data APIs, and content platforms
  using CheapPay.
</Card>

***

## Quick Example

```typescript theme={null}
import { solanaPaymentMiddleware } from '@cheapay/x402-express';
import { TokenMint } from '@cheapay/x402';

// Protect your API endpoint with $0.01 USDC payment
app.use(
  '/api/premium-data',
  solanaPaymentMiddleware({
    payTo: 'YourSolanaAddressHere',
    routes: {
      '/*': {
        price: '$0.01',
        network: 'solana-mainnet',
        mint: TokenMint.USDC.mainnet,
      },
    },
  })
);

// Your protected endpoint
app.get('/api/premium-data', (req, res) => {
  res.json({
    data: 'Premium content unlocked!',
    earnings: 'Every call = $0.01 in your wallet',
  });
});
```

**That's it!** Your API now accepts cryptocurrency payments. Users pay with their Solana wallet, and you receive USDC instantly.