Guides · API

Dutch house prices API

Netherlands house prices (huizenprijzen, WOZ-waarde) for any postcode or CBS buurt code: average home value (WOZ) in the neighbourhood with its trend, plus actual average sale prices per year in the municipality vs the national average. Property valuation context for real estate, mortgage, investment and relocation agents. Source: CBS, Kadaster.

0.003 USDC per call · GET /v1/house-prices · free preview at /v1/house-prices/preview

Parameters

Name	Required	Description
`postcode`	no	Any Dutch postcode in the neighbourhood, e.g. 3511LX
`code`	no	Alternative: CBS neighbourhood code, e.g. BU03440612

Example request

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

Example response

{
  "neighbourhood": {
    "code": "BU05182245",
    "name": "Zeeheldenkwartier",
    "municipality": "'s-Gravenhage"
  },
  "neighbourhood_avg_home_value_eur": 403000,
  "municipality_sale_prices": {
    "municipality_code": "GM0518",
    "year": 2025,
    "avg_sale_price_eur": 465418,
    "national_avg_sale_price_eur": 479527,
    "change_5y_pct": 30.8
  },
  "source": "CBS (WOZ values; sale prices 83625NED)"
}

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 Dutch house prices cost?

0.003 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/house-prices/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.