npm install x402-next @coinbase/x402

import { paymentMiddleware } from 'x402-next';

export const middleware = paymentMiddleware(
  "0xYourAddress",
  {
    '/protected': {
      price: '$0.01',
      network: "sei-testnet",
      config: {
        description: 'Access to protected content'
      }
    },
  }
);

// Configure which paths the middleware should run on
export const config = {
  matcher: [
    '/protected/:path*',
  ]
};

type RoutesConfig = Record<string, Price | RouteConfig>;

interface RouteConfig {
  price: Price;           // Price in USD or token amount
  network: Network;       // "sei" or "seiTestnet"
  config?: PaymentMiddlewareConfig;
}

interface PaymentMiddlewareConfig {
  description?: string;               // Description of the payment
  mimeType?: string;                  // MIME type of the resource
  maxTimeoutSeconds?: number;         // Maximum time for payment (default: 60)
  outputSchema?: Record<string, any>; // JSON schema for the response
  customPaywallHtml?: string;         // Custom HTML for the paywall
  resource?: string;                  // Resource URL (defaults to request URL)
}

// middleware.ts
import { paymentMiddleware } from 'x402-next';
// Use facilitator URL instead of import

export const middleware = paymentMiddleware(
  "0xYourAddress",
  {
    '/api/premium': {
      price: '$0.05',
      network: "sei-testnet",
      config: {
        description: 'Premium API access',
        maxTimeoutSeconds: 120,
      }
    },
    '/api/data-feed': {
      price: '$0.01',
      network: "sei-testnet",
      config: {
        description: 'Real-time data feed',
        mimeType: 'application/json',
      }
    }
  },
  facilitator,
  {
    appName: 'My Next.js App',
    appLogo: '/logo.png'
  }
);

export const config = {
  matcher: [
    '/api/premium/:path*',
    '/api/data-feed/:path*',
  ]
};

// pages/api/premium/index.ts or app/api/premium/route.ts
export async function GET() {
  return Response.json({
    message: "This is premium content",
    data: {
      timestamp: new Date().toISOString(),
      premium: true
    }
  });
}

// middleware.ts
import { paymentMiddleware } from 'x402-next';

export const middleware = paymentMiddleware(
  "0xYourAddress",
  {
    '/dashboard': {
      price: '$0.10',
      network: "sei-testnet",
      config: {
        description: 'Premium dashboard access'
      }
    }
  }
);

export const config = {
  matcher: ['/dashboard/:path*']
};

// middleware.ts
import { paymentMiddleware } from 'x402-next';

export const middleware = paymentMiddleware(
  "0xYourAddress",
  {
    '/premium': {
      price: '$0.05',
      network: "sei-testnet",
      config: {
        description: 'Premium page access'
      }
    }
  }
);

export const config = {
  matcher: ['/premium/:path*']
};

// middleware.ts
export const config = {
  matcher: [
    '/api/premium/:path*',
    '/protected/:path*'
  ],
  runtime: 'edge' // Optional: explicitly use Edge Runtime
};