Hungarian Postcode & Address Validator

Name: Hungarian Postcode Validator
Author: unbearabledev

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.

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

Tool	Purpose	Price
`lookup_postcode(postcode)`	Settlement + county + (if BP) district for a 4-digit HU postcode	$0.001
`lookup_city(city)`	All postcodes for a city (diacritic-insensitive — `gyor` matches `Győr`)	$0.001
`validate_address(postcode, city)`	yes/no + corrected suggestion if mismatch	$0.001
`budapest_district_lookup(district)`	Budapest I-XXIII (or 1-23) → list of postcodes in that district	$0.001
`list_postcodes_in_county(county_name)`	Bulk listing — every postcode in a county	$0.005

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

Event	USD per call
`lookup-call` (most tools)	$0.001
`bulk-call` (`list_postcodes_in_county`)	$0.005

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.