generated: '2026-08-13'
method: searched
source: https://developer.spyfu.com/mcp
status: published
description: SpyFu serves a remote Model Context Protocol endpoint from its own developer portal host
  at https://developer.spyfu.com/mcp. A GET returns HTTP 200 with the plain-text body "This URL can only
  be accessed with a MCP client"; a JSON-RPC POST (initialize or tools/list) returns HTTP 401 with {"jsonrpc":"2.0","error":{"code":-32001,"message":"Authorization
  required"}}. The endpoint is provisioned by the ReadMe-hosted developer portal, so it is a documentation/API-reference
  MCP surface rather than a bespoke SpyFu data server. Because the server requires authorization and publishes
  no RFC 9728 protected-resource metadata, the live tool set and its inputSchemas could not be enumerated
  anonymously — no tool list is recorded here, and none is guessed.
deployment:
  mode: remote
  endpoint: https://developer.spyfu.com/mcp
  install: null
  package: null
  auth: unknown
  verified: probed
  note: auth is "unknown" rather than "oauth" deliberately — the 401 carries no WWW-Authenticate challenge
    and both /.well-known/oauth-protected-resource and /.well-known/oauth-authorization-server return
    404, so the scheme is not anonymously discoverable.
  probe_prior: (never probed)
  probe: gated
  probe_why: JSON-RPC error envelope -- the MCP server answered
  checked: '2026-09-11'
  source: claimed-backlog re-probe 2026-09-11
server:
  name: spyfu-developer-docs
  transport: http
  url: https://developer.spyfu.com/mcp
  host: developer.spyfu.com
  platform: ReadMe-hosted developer portal
tools: []
tools_note: tools/list is auth-gated (HTTP 401). SpyFu's llms.txt publishes no tool list either, so there
  is no published names+descriptions fallback. Input schemas require authenticated introspection. Deliberately
  left empty rather than derived from OpenAPI operations, because this is a published server and a derived
  tool list would misrepresent what it actually exposes.
related_agent_surfaces:
- kind: AgentSkill
  url: https://developer.spyfu.com/.well-known/agent-skills/index.json
  note: Provider-published Agent Skill (read-the-docs), saved to skills/.
- kind: llms.txt
  url: https://developer.spyfu.com/llms.txt
  note: 60-line index of every guide and API reference page.
- kind: ChatGPT actions OpenAPI
  url: https://github.com/spyfu/spyfu_api_docs/blob/v1.0/chatgpt/SpyFuAPI_For_ChatGPT.json
  note: First-party aggregated OpenAPI 3.1.0 (18 paths, server https://api.spyfu.com/apis) that SpyFu
    publishes for its Custom GPT.
x-evidence:
- url: https://developer.spyfu.com/mcp
  method: GET
  http_status: 200
  body: This URL can only be accessed with a MCP client.
  fetched: '2026-08-13'
- url: https://developer.spyfu.com/mcp
  method: POST
  jsonrpc_method: initialize
  http_status: 401
  body: '{"jsonrpc":"2.0","error":{"code":-32001,"message":"Authorization required"},"id":null}'
  fetched: '2026-08-13'
- url: https://developer.spyfu.com/mcp
  method: POST
  jsonrpc_method: tools/list
  http_status: 401
  fetched: '2026-08-13'