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PPN Hub — public APIs over MCP

by ppn-hub.com · remote · no sign-in to list tools · v1.2.1 · published by com.ppn-hub

One MCP endpoint over 69 public PPN APIs: search_apis to discover, execute_api to call. Free tier.

Changes · 2
CompareRegistry entry

3 tools: 2 change things and 1 only read.

Scanned Oct 21, 2026

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http ppn-hub https://mcp.ppn-hub.com/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

3 tools

Changes things 2Claude Code: ask
  • environment_briefEnvironmental brief for one location: fans out to every public geo-aware API (weather, terrain, environment, …) and returns a merged JSON.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Environmental brief for one location: fans out to every public geo-aware API (weather, terrain, environment, …) and returns a merged JSON. Partial results come back with an errors[] list. Requires 'Authorization: Bearer ppn_live_*'.
  • execute_apiExecute a request against any of the 60 registered APIs.No findings

    Why it is in this group

    • The name "execute_api" says "execute": a word for a change.
    Description, as the server wrote it
    Execute a request against any of the 60 registered APIs. Use search_apis first to find the correct api name and operationId. Requires 'Authorization: Bearer ppn_live_*'.
Only reads 1Claude Code: allow
  • search_apisSearch across 519 endpoints in 60 APIs (amenomi, cultural, earth, energy-calc, green-path, harmonias, hydrogen, internal, nanobase, nanosnap, natura, platform, sakurahub, science, …No findings

    Why it is in this group

    • The name "search_apis" says "search": a word for reading.
    Description, as the server wrote it
    Search across 519 endpoints in 60 APIs (amenomi, cultural, earth, energy-calc, green-path, harmonias, hydrogen, internal, nanobase, nanosnap, natura, platform, sakurahub, science, sim, space, stocks). Returns matching endpoints with method, path, summary, parameters, and a ready-to-run example. Use this to discover available API endpoints before calling execute_api. Results carry a "coverage" field (e.g. ["JP"]) for region-limited APIs; use the "region" filter to narrow.

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 1.2.1. Values in angle brackets are yours to fill in.

claude mcp add --transport http ppn-hub https://mcp.ppn-hub.com/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__ppn-hub__search_apis"
    ],
    "ask": [
      "mcp__ppn-hub__execute_api",
      "mcp__ppn-hub__environment_brief"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as ppn-hub. Review it before you use it.