Guides · API

All addresses in a Dutch postcode API

Every official address in a Dutch postcode (alle adressen per postcode, BAG): street, house number, letter and addition, BAG object id and coordinates, sorted. For address pickers, door-to-door delivery and canvassing routes, data cleaning and real estate agents. Source: Kadaster BAG via PDOK.

0.005 USDC per call · GET /v1/postcode/addresses · free preview at /v1/postcode/addresses/preview

Parameters

Name	Required	Description
`postcode`	yes	6-character Dutch postcode, e.g. 2517AS

Example request

curl "https://factline.dev/v1/postcode/addresses?postcode=2517AS"
# 402 Payment Required: pay with an x402 client (USDC on Base), or send
# Authorization: Bearer <your Factline API key>

Example response

{
  "postcode": "2517AS",
  "city": "'s-Gravenhage",
  "count": 118,
  "addresses": [
    {
      "label": "Laan van Meerdervoort 98, 2517AS 's-Gravenhage",
      "street": "Laan van Meerdervoort",
      "house_number": 98,
      "house_letter": null,
      "house_number_addition": null,
      "bag_object_id": "0518010000688907",
      "lat": 52.08363811,
      "lon": 4.29201429
    },
    {
      "label": "Laan van Meerdervoort 100, 2517AS 's-Gravenhage",
      "street": "Laan van Meerdervoort",
      "house_number": 100,
      "house_letter": null,
      "house_number_addition": null,
      "bag_object_id": "0518010001775699",
      "lat": 52.08359668,
      "lon": 4.29193161
    },
    {
      "label": "Laan van Meerdervoort 100A, 2517AS 's-Gravenhage",
      "street": "Laan van Meerdervoort",
      "house_number": 100,
      "house_letter": "A",
      "house_number_addition": null,
      "bag_object_id": "0518010000432205",
      "lat": 52.08358839,
      "lon": 4.29191123
    }
  ],
  "source": "Kadaster BAG via PDOK Locatieserver"
}

Use it from an AI agent

Agents with an x402 wallet call the URL directly and pay per request. Assistants that speak MCP connect to https://factline.dev/mcp. Full reference: docs, OpenAPI, llms.txt. Businesses: API keys with a free trial.

Questions

How much does the All addresses in a Dutch postcode cost?

0.005 USDC per call, paid per request with x402 (no account), or included in a Factline API key plan with a free trial. Calls that fail are not charged.

Can I try it for free?

Yes: GET /v1/postcode/addresses/preview with the same parameters validates your input and shows what the paid answer contains, at no cost.

Where does the data come from?

Official public registers and open data, named with their licence in every response (source field) and at /.well-known/x402-license-provenance.