Developer fixes x402 protocol bugs after Cloudflare tunnel blocked catalog listing

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A developer building x402-linter, an HTTP service that validates Payment Required responses using the x402 v2 protocol, encountered two separate bugs while attempting to register the service with the x402scan catalog. The first issue was that returning an HTTP 402 status code alone was insufficient — the v2 protocol also requires a PAYMENT-REQUIRED header containing a base64-encoded copy of the JSON body, and missing CORS headers prevented cross-origin clients from reading it. The second problem emerged when a Cloudflare trycloudflare tunnel was used as a public origin: x402scan rejected it outright because ephemeral tunnel URLs cannot be reliably discovered by agents. The team resolved both issues by adding the required header, fixing CORS configuration, and deploying the service to a permanent Cloudflare Workers URL. The experience highlighted that a technically correct 402 response and a catalog-discoverable origin are two distinct requirements that must both be satisfied.

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