Sellerx Authentication

generated: '2026-08-05'
method: searched
source: https://mcp.sellerx.com/.well-known/oauth-authorization-server
docs: null
note: >-
  SellerX publishes no OpenAPI, so this profile is not derived from
  securitySchemes. It is read verbatim from the RFC 8414 authorization-server
  metadata and the RFC 9728 protected-resource metadata that the SellerX MCP
  host serves anonymously, plus the observed 401 challenge on the MCP endpoint.

summary:
  types: [oauth2]
  api_key_in: []
  oauth2_flows: [authorizationCode]
  bearer_methods: [header]
  pkce_required: true
  dynamic_client_registration: true

schemes:
- name: OAuth2
  type: oauth2
  applies_to: https://mcp.sellerx.com/mcp
  sources:
  - well-known/sellerx-oauth-authorization-server.json
  - well-known/sellerx-oauth-protected-resource.json
  issuer: https://mcp.sellerx.com/
  flows:
  - flow: authorizationCode
    authorizationUrl: https://mcp.sellerx.com/authorize
    tokenUrl: https://mcp.sellerx.com/token
    refreshUrl: https://mcp.sellerx.com/token
    scopes:
      read: >-
        The only scope advertised in scopes_supported. SellerX publishes no
        scope reference describing what it grants.
  registration_endpoint: https://mcp.sellerx.com/register
  grant_types_supported: [authorization_code, refresh_token]
  response_types_supported: [code]
  token_endpoint_auth_methods_supported: [client_secret_post]
  code_challenge_methods_supported: [S256]
  bearer_methods_supported: [header]

observed_challenge:
  url: https://mcp.sellerx.com/mcp
  http_status: 401
  www_authenticate: >-
    Bearer error="invalid_token", error_description="Authentication failed. The
    provided bearer token is invalid, expired, or no longer recognized by the
    server. To resolve: clear authentication tokens in your MCP client and
    reconnect. Your client should automatically re-register and obtain new
    tokens.",
    resource_metadata="https://mcp.sellerx.com/.well-known/oauth-protected-resource/mcp"

gaps:
- >-
  No OpenID Connect discovery: /.well-known/openid-configuration returns 404, so
  the authorization server is OAuth 2.0/2.1 only, not OIDC.
- >-
  No human-readable authentication documentation is published anywhere on
  sellerx.com; the metadata endpoints are the only public description of the
  auth model.
- >-
  scopes_supported carries a single opaque `read` scope with no published
  meaning, so a client cannot reason about least privilege before registering.

x-evidence:
  fetched: '2026-08-05'
  probed:
  - url: https://mcp.sellerx.com/.well-known/oauth-authorization-server
    http_status: 200
  - url: https://mcp.sellerx.com/.well-known/oauth-protected-resource/mcp
    http_status: 200
  - url: https://mcp.sellerx.com/mcp
    http_status: 401
  - url: https://mcp.sellerx.com/.well-known/openid-configuration
    http_status: 404