x402 Doctor is a Model Context Protocol (MCP) server: Diagnose x402 seller endpoints: what is wrong with your 402 challenge, and how to fix it. Because it speaks the Model Context Protocol, AI assistants can use x402 Doctor as a set of callable tools instead of you copy-pasting between apps.
It's a hosted (remote) server — point your client at https://x402-doctor.tsharpe.workers.dev/mcp and you're connected, with nothing to install locally. The current release is v1.0.0, with source at tsharpe2282-web/twelve-permissions on GitHub.
On mcp.site, x402 Doctor sits in the Development category. Any MCP client can use it — Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, Zed among them — via the install snippets below. If you maintain x402 Doctor for twelvepermissions.com, claim this listing to verify ownership, earn the Verified badge, and keep the details current.