RFC 9728 protected-resource metadata (served by the MCP ORIGIN, not this API).

Documented here for discovery-chain completeness: this path is served by the MCP resource server's
origin (mcp.blockchain0x.com / dev-mcp / staging-mcp / local
mcp.localhost - integrations/mcp-server, NOT the API hosts in
the servers list above). A path-aware variant exists at
/.well-known/oauth-protected-resource/mcp with the identical
body. It names this API as the authorization server, which is
how clients find the RFC 8414 document below. 404 while the
MCP server's MCP_PUBLIC_BASE_URL / MCP_AUTH_SERVER_URL pair is
unset.

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