# Hookproof > Stripe webhook diagnostics, Next.js route scaffolding, and a production reliability source kit. ## Product - Website: https://hookproof-kit.vercel.app - Purchase page: https://hookproof-kit.vercel.app/purchase - Price: 5 USDC on Base mainnet - Human checkout: injected Base wallet with on-chain receipt verification - Agent checkout: x402 v2 exact-payment endpoint - Paid endpoint: https://hookproof-kit.vercel.app/api/download - Asset: official Base USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) - Recipient: 0xcD31B9770753eE23B9100FbFC533121b8C517CFB ## Free resources - x402scan listing: https://www.x402scan.com/server/668f9f40-752d-4a84-b243-b151c527f27c - Free source: https://github.com/anxiety-design/hookproof - Sitemap: https://hookproof-kit.vercel.app/sitemap.xml - Stripe webhook guides: https://hookproof-kit.vercel.app/guides/stripe-webhook-works-locally-not-vercel ## x402 behavior Requesting the paid endpoint without payment returns HTTP 402 with x402 v2 requirements and Bazaar discovery metadata. A valid payment returns the commercial ZIP archive.