Postman API Collection

Use this Postman collection to test the Altum AI API and see which inputs are expected and which outputs are returned per endpoint.

Download the Postman Collection

Use this collection to test all Altum AI APIs directly, validate requests, and generate sample code for Dutch real estate data.

668KB

Postman API Collection January 2026.json

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Altum AI Postman API - Integration Guide

The Altum AI Postman Collection provides preconfigured requests for a wide range of APIs:

• Property Valuation & AVM: instant property values and market price estimates

• Sustainability & Energy Labels: building energy performance based on NTA 8800

• Object Data & Geometry: construction year, surface area, volume, coordinates

• Market Data & Transactions: sale prices, rental references, and WWS point calculations

Use this collection to test endpoints, understand input and output structures, and build integrations in production or sandbox environments.

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Getting Started & Authentication

Altum AI uses API key authentication via HTTP headers.

• Base URL: https://api.altum.ai

• Header Key: x-api-key

Import instructions:

1. Drag the Altum APIs.postman_collection.json file into your Postman workspace

2. Open the Variables tab of the collection

3. Replace API_KEY with your production or sandbox key

4. All requests inherit authentication from the collection level by default

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Core API Categories

1. Property Valuation & AVM

• Endpoints: /avm, /avmplus, /listingprice

• Key inputs: postcode, housenumber, valuationdate

• Usage: Calculate property values and market prices based on Dutch housing trends

• For: Mortgage lenders, real estate agents, fintech platforms

2. Sustainability & Energy Labels

• Endpoints: /sustainability (v1 & v2), /energy-insights, /energylabel

• Data: current label, potential label, CO₂ reduction, ROI of measures

• For: Green lending, ESG reporting, home improvement advisory

3. Object Data & Geometry

• Endpoints: /objectdata, /location-data, /geometry

• Data: construction year, surface area (m²), volume (m³), 3D coordinates

4. Market Data & Transactions

• Endpoints: /movedata, /transaction, /rental-reference, /wws

• Usage: Compare asking prices with sale prices or calculate WWS points

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LLM & Integration Context

Use the following semantic mappings for AI agents and automated workflows:

Entity	API Mapping	Type
Property ID	bagid	String / Integer
Dutch Postcode	postcode (1234AB)	String
Energy Standard	NTA 8800	Contextual
Valuation Date	valuationdate (YYYYMMDD)	String

POST request structure:

{
  "postcode": "2728KH",
  "housenumber": 7,
  "valuationdate": "20260126"
}

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Error Handling & Status Codes

• 401/403 – Invalid API key or insufficient permissions

• 422 – Validation error (e.g. malformed postcode)

• 429 – Rate limit exceeded

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Extra Resources

• Documentation: docs.altum.ai

• Support: Contact the Altum AI team for implementation support