x402 Seller Kit

A tested Cloudflare Worker template for selling a digital download for USDC on Base without a facilitator: an x402 v2 402 challenge with Bazaar metadata, an order-code checkout (unique exact amount + secret order ID) so public tx hashes can't be claimed by someone else, one-time claims in D1, rate limits, RPC fallbacks, a written threat model and a list of free x402 directories. $29 USDC one-time. Free starters (Cloudflare x402-proxy-template, x402 quickstarts) exist; this adds the human checkout and claim security. Free preview and guide on the site.