Mortgage Offer API: What type of companies does key4 typically work with?

We are open to working with a variety of partner types. Our ongoing partnerships include real estate search platforms, real estate agents, home owner platforms and independent mortgage brokers. If you have a relevant client touchpoint with mortgages or with an adjacent topic, we would be interested in getting into contact with you. 

Mortgage Offer API: How does key4 compensate its partners?

We have different compensation models available for our partners. Please get in touch to find out the details.

Mortgage Offer API: What type of mortgage conditions does the key4 API provide?

The API calculates the best indicative conditions available for the requested profiles and financing structure on the key4 platform. Conditions through the API are the same as offered on the key4 website.

Mortgage Offer API: Who are the investors on key4?

key4 cooperates with a variety of Swiss institutional investors as financing providers. We do not disclose their names at the stage of the first indicative offer provided online by the API. After an offline advisory session has taken place at UBS, we prepare a second indicative offer for the client in which the names of loan providers are disclosed to the client directly.

Mortgage Offer API: Are there any expert options available?

The key4 Mortgage Offer API offers an “expert mode”, which allows interested parties to request mortgages with a specific financing structure with specific terms and volumes. If no financing structure is specified, the API can provide a set of different financing structure suggestions according to the selected risk profile.

Mortgage Offer API: What use cases are possible with the key4 API?

We have different partnership models available, depending on your needs and financing expertise. If you are an independent mortgage broker, you can, for example, use the API to determine whether key4 has a relevant offer for your specific client request. If you run a real estate platform, you can use the API to provide individual real-time indicative mortgage quotes to your users. Please get in touch to learn more about all options.

Mortgage Offer API: Can anyone access the key4 API?

No, an API key is needed and provided to partners only after a partnership contract is signed. Find out how to become a partner


In case your question is not covered or you need information related to technical API support or you need to report an API bug. Please reach out to us.