# Financing - [Mortgage Calculation API](https://docs.altum.ai/english/financing/mortgage-calculation-api.md): The Mortgage Calculation API performs real-time, data-driven mortgage calculations for the Dutch housing market. - [Authentication, input and response](https://docs.altum.ai/english/financing/mortgage-calculation-api/authentication-input-and-response.md) - [API Key Information](https://docs.altum.ai/english/financing/mortgage-calculation-api/api-key-information.md): Understanding and Obtaining Your API Key - [Output interpretation](https://docs.altum.ai/english/financing/mortgage-calculation-api/output-interpretation.md): An explanation and interpretation of every feature outputted in the API response. - [Rental Reference API](https://docs.altum.ai/english/financing/rental-reference-api.md): The interactive rental reference API gives the appraiser full flexibility on finding rental reference objects based on multiple variables. - [Changelog](https://docs.altum.ai/english/financing/rental-reference-api/changelog.md) - [Authentication, input and response](https://docs.altum.ai/english/financing/rental-reference-api/authentication-input-and-response.md) - [API Key Information](https://docs.altum.ai/english/financing/rental-reference-api/api-key-information.md): Understanding and Obtaining Your API Key - [Output interpretation](https://docs.altum.ai/english/financing/rental-reference-api/output-interpretation.md): An explanation and interpretation of every feature outputted in the API response. - [WWS Points API](https://docs.altum.ai/english/financing/wws-points-api.md): For retrieving the wws points of a property, usefull for the rental price of it. - [API Key Information](https://docs.altum.ai/english/financing/wws-points-api/api-key-information.md): Understanding and Obtaining Your API Key - [Authentication, input and response](https://docs.altum.ai/english/financing/wws-points-api/authentication-input-and-response.md) - [Specifications for independent home version 01-01-2026](https://docs.altum.ai/english/financing/wws-points-api/specifications-for-independent-home-version-01-01-2026.md): The following information describes the inputs required for each rule in the WWS calculation according to the 01-01-2026 rules. This ensures correct and consistent data entry into the API for accurate - [Specifications for non independent home version 01-01-2026](https://docs.altum.ai/english/financing/wws-points-api/specifications-for-non-independent-home-version-01-01-2026.md): The following information describes the inputs required for each rule in the WWS calculation according to the 01-01-2026 rules. This ensures correct and consistent data entry into the API for accurate - [Specifications for independent home version 01-01-2025](https://docs.altum.ai/english/financing/wws-points-api/specifications-for-independent-home-version-01-01-2025.md): The following information describes the inputs required for each rule in the WWS calculation according to the 01-01-2025 rules. This ensures correct and consistent data entry into the API for accurate - [Specifications for non-independent home version 01-01-2025](https://docs.altum.ai/english/financing/wws-points-api/specifications-for-non-independent-home-version-01-01-2025.md) - [Input explanation for version 01-01-2025](https://docs.altum.ai/english/financing/wws-points-api/input-explanation-for-version-01-01-2025.md): This page is about the input features for the endpoints that are for the version 01-07-2024. A full explanation of the features is covered, and also the structure of the input and the blocks in it. - [Specifications for independent home version 01-07-2024](https://docs.altum.ai/english/financing/wws-points-api/specifications-for-independent-home-version-01-07-2024.md): The information need for the rules that are used to calculate the points based on the version 01-07-2024. This information is crucial for the correct definition of the inputs by the user. - [Specifications for non-independent home version 01-07-2024](https://docs.altum.ai/english/financing/wws-points-api/specifications-for-non-independent-home-version-01-07-2024.md): The information need for the rules that are used to calculate the points based on the version 01-07-2024. This information is crucial for the correct definition of the inputs by the user. - [Input explanation for version 01-07-2024](https://docs.altum.ai/english/financing/wws-points-api/input-explanation-for-version-01-07-2024.md): This page is about the input features for the endpoints that are for the version 01-07-2024. A full explanation of the features is covered, and also the structure of the input and the blocks in it. - [Specifications for independent home version 01-01-2024](https://docs.altum.ai/english/financing/wws-points-api/specifications-for-independent-home-version-01-01-2024.md): The information need for each rule that is used to calculate the points based on the rules of the version 01-01-2024. This information is crucial for the correct definition of the inputs by the user. - [Specifications for non-independent home version 01-01-2024](https://docs.altum.ai/english/financing/wws-points-api/specifications-for-non-independent-home-version-01-01-2024.md): The information need for each rule that is used to calculate the points based on the rules of the version 01-01-2024. This information is crucial for the correct definition of the inputs by the user. - [Output interpretation](https://docs.altum.ai/english/financing/wws-points-api/output-interpretation.md): An explanation and interpretation of every feature outputted in the API response. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.altum.ai/english/financing.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.