Public Data

10 zero-API-key public data tools for Claude Desktop. Free. MIT.

All the things you Google once a week but shouldn't — sunrise times, holidays, timezones, geocoding — bundled into one MCP server. No API keys. No accounts. No config.

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Install

Option 1: Claude Desktop (recommended)

1. Open Claude Desktop → Settings → Extensions → Browse extensions
2. Search "Public Data" → Install
3. Done.

Option 2: Manual config

{
  "mcpServers": {
    "public-data": {
      "command": "npx",
      "args": ["-y", "mcp-public-data"]
    }
  }
}

Requires Node.js 22.18+.

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Tools (10)

Astronomy

• sunrise_sunset — Sunrise, sunset, all twilight times for any coordinate/date.
• moon_phase — Phase, illumination %, label (e.g., "Waxing Gibbous").

Calendar

• is_holiday — Is a given date a public holiday in country X?
• next_holiday — Next upcoming holiday for any country.

Time

• timezone_of — IANA timezone for any lat/lon.
• convert_time — Convert time between two IANA timezones.

Geography

• geocode — Address/place → lat/lon (top 5 matches).
• reverse_geocode — Lat/lon → human-readable address.
• distance — Great-circle distance (km, miles, nautical miles).
• elevation — Elevation in meters and feet.

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Example prompts

• "When does the sun set in Tokyo today?"
• "What's the moon phase tomorrow?"
• "Is Friday a public holiday in Germany?"
• "What's the next holiday in Canada?"
• "What timezone is at lat 35.6, lon 139.7?"
• "Convert 2pm Toronto time to Tokyo."
• "Geocode 'Eiffel Tower'."
• "What's the distance from London to Paris?"
• "What's the elevation at lat 27.99, lon 86.93?"

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API sources (all free, all keyless)

• sunrise-sunset.org — Sunrise/sunset
• Moon phase — Pure math (Conway algorithm), no API
• date.nager.at — Public holidays for 100+ countries
• OpenStreetMap Nominatim — Geocoding (rate-limited, please be reasonable)
• open-elevation.com — Elevation

We honor each service's rate limits and User-Agent requirements.

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Why?

Claude Desktop is great at conversation, lousy at facts that require live lookup. mcp-public-data fills the gap for the 80% of "what is X right now" questions without forcing the user to set up API keys.

Specifically built for the .mcpb (Anthropic Desktop Extensions) directory, where zero-config matters more than feature breadth.

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Sister servers from dpm

• mcp-devkit — UUID, hash, JWT, JSON, cron, color, password (zero deps, free).

More small, sharp utilities coming weekly. Follow the dpm catalog at <dpm-landing-url> for updates.

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License

MIT © dpm (digital product mill)