Hu Postcode Validator MCP Server

Hungarian Postcode & Address Validator

MCP server that validates Hungarian postcodes and addresses. Powered by the official Magyar Posta catalog and KSH (Hungarian Central Statistics Office) settlement data. Pennies per call.

Built by Unbearable Labs. Pay-per-event pricing — only billed when a tool is actually called.

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Available on

• Apify Actor Store — primary, metered usage (PPE)
• MCPize — pending submission
• MCP.so — pending submission
• PulseMCP — pending submission
• Smithery — pending submission
• Glama — pending submission

Newsletter: Unbearable TechTips Weekly · All Actors: github.com/UnbearableDev

What it does

Point any MCP-capable client (Claude Desktop, Cursor, n8n, Make, Zapier, custom agents) at this server and get fast, structured answers to Hungarian address questions:

• Validate a (postcode, city) pair before storing it in your DB
• Look up the settlement and county for any HU postcode
• Find all postcodes that serve a given city (handy for Budapest: 23 districts, 100+ postcodes)
• List every postcode in a Hungarian county
• Map Budapest district numbers (1–23 or I–XXIII) to their postcode ranges

Tools

Example responses

lookup_postcode(1102)

{
  "postcode": 1102,
  "found": true,
  "matches": [
    {
      "postcode": 1102,
      "settlement": "Budapest",
      "settlement_part": "X. kerület",
      "county": "Budapest"
    }
  ],
  "budapest_district": "X."
}

validate_address(1102, "Szeged")

{
  "valid": false,
  "reason": "city_mismatch",
  "postcode": 1102,
  "city": "Szeged",
  "expected_settlements": ["Budapest"]
}

budapest_district_lookup(14) (or "XIV") returns all postcodes in District XIV.

Pricing

Effectively a free utility for occasional use; meaningful at high call volumes.

Data sources

• Magyar Posta official postal catalog (Iranyitoszam-Internet_uj.xlsx) — postcode → settlement mapping
• KSH (Hungarian Central Statistical Office) settlement registry — county / district / KSH code per settlement, via the open tamas-ferenci/IrszHnk compilation

Coverage: 3,484 postcode-settlement entries spanning 2,962 unique postcodes (1011–9985), all 19 Hungarian counties + Budapest. Refreshed quarterly.

Connecting from Claude Desktop

{
  "mcpServers": {
    "hu-postcode": {
      "transport": "streamable-http",
      "url": "https://YOUR-ACTOR-URL.apify.actor/mcp"
    }
  }
}

What's NOT covered

• Street-level address validation (no clean public data source post-2022 KEKKH restrictions)
• Fuzzy / Levenshtein city-name matching (v1.1)
• Non-Hungarian addresses (consider another MCP for those)

Source / contact

Issues and ideas: unbearabledev@gmail.com or the GitHub org UnbearableDev.