Koopsom API

get

Returns a list of reference objects and their transaction prices.

Authorizations

BearerAuth

Query parameters

postalCodestringRequired

Zipcode

Example: 1251NJ

houseNumberintegerRequired

House number

Example: 22

houseLetterstringOptional

House letter

houseNumberExtstringOptional

House number extention

valuationDatestring · dateOptional

Valuation date

Default: 2025-10-02Example: 2025-10-02

dateTransportstring · dateOptional

The acceptance date is the date on which you, as a buyer, become the owner of the house.

Responses

200

TransactionFinderResponse

application/json

400

HTTP 400

application/json

401

HTTP 401

application/json

403

HTTP 403

application/json

404

HTTP 404

application/json

500

HTTP 500

application/json

get

HTTPcURLJavaScriptPython

GET /v1/mx-transaction-finder?postalCode=1251NJ&houseNumber=22 HTTP/1.1
Host: api.matrixian.com
Authorization: Bearer YOUR_SECRET_TOKEN
Accept: */*

{
  "statusCode": 200,
  "headers": {
    "Content-Type": "application/json"
  },
  "isBase64Encoded": false,
  "body": {
    "id": "string",
    "params": {
      "postalCode": "1251NJ",
      "houseNumber": "22",
      "valuationDate": "2025-10-02"
    },
    "data": {
      "postalCode": "1251NJ",
      "houseNumber": 22,
      "houseLetter": null,
      "houseNumberExt": null,
      "saleDate": "2025-10-02",
      "transportDate": "2025-10-02",
      "transactionDate": "2025-10-02",
      "transactionPrice": 1,
      "transactionPriceIndexed": 1,
      "transactionPriceIndexedDateTransport": 1,
      "transactionPriceIndexedDateSale": 1,
      "valuationDate": "2025-10-02"
    },
    "error": {},
    "meta": {},
    "status": "success"
  }
}