Guides · API

Dutch rent points (WWS) estimate API

Netherlands rent check (huurcheck, huurpunten berekenen, WWS) for one address: estimated points range from BAG floor area, energy label and neighbourhood WOZ, the likely rent segment (social up to 143 points, middle 144-186, free sector 187+) and the approximate maximum basic rent (2026 limits). An estimate, with a link to the official Huurcommissie check. For tenant, relocation and housing agents. Input: postcode + house number.

0.01 USDC per call · GET /v1/rent-check · free preview at /v1/rent-check/preview

Parameters

Name	Required	Description
`postcode`	no	Dutch postcode, 4 digits + 2 letters, e.g. 3511LX
`house_number`	no	House number, e.g. 1
`house_letter`	no	Optional house letter, e.g. A
`addition`	no	Optional house number addition, e.g. 2 or BIS
`q`	no	Alternative to postcode: free-text address, e.g. 'Visschersplein 1 Utrecht'

Example request

curl "https://factline.dev/v1/rent-check?postcode=2517AS&house_number=100"
# 402 Payment Required: pay with an x402 client (USDC on Base), or send
# Authorization: Bearer <your Factline API key>

Example response

{
  "address": {
    "label": "Laan van Meerdervoort 100, 2517AS 's-Gravenhage",
    "postcode": "2517AS",
    "house_number": 100,
    "city": "'s-Gravenhage"
  },
  "summary": "Estimated 140 to 179 rent points: on the border between social rent and middle rent (most likely middle rent). The exact kitchen, bathroom and outdoor space decide it.",
  "points": {
    "low": 140,
    "high": 179
  },
  "segment": {
    "low_estimate": "social",
    "high_estimate": "middle",
    "most_likely": "middle",
    "certain": false,
    "explained": "Middle rent (middenhuur): 144 to 186 points."
  },
  "max_rent_eur_per_month": {
    "low": 912.34,
    "high": 1178.31,
    "note": "Maximum basic rent (kale huur) for the points, excluding service costs."
  },
  "breakdown": {
    "floor_area": {
      "low": 71.25,
      "high": 74,
      "basis": "75 m2 usable floor area (BAG)"
    },
    "energy_label": {
      "low": 30,
      "high": 30,
      "basis": "label B, multi-family table"
    },
    "woz_value": {
      "low": 25.75,
      "high": 38.5,
      "basis": "estimated WOZ EUR 237,000 to 355,000 from the neighbourhood average",
      "capped_at_33_percent": false
    },
    "kitchen": {
      "low": 4,
      "high": 7
    },
    "sanitary": {
      "low": 8,
      "high": 11
    },
    "heating": {
      "low": 6,
      "high": 10
    },
    "outdoor_space": {
      "low": -5,
      "high": 8
    }
  },
  "thresholds_2026": {
    "social_max_points": 143,
    "social_max_rent_eur": 932.93,
    "middle_max_points": 186,
    "middle_max_rent_eur": 1228.07
  },
  "official_check": "https://www.huurcommissie.nl/huurprijscheck"
}

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 rent points (WWS) estimate cost?

0.01 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/rent-check/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.