onOffice API: the interface for real estate agents
The programming interface that links your systems together and makes data transfer easy.


The programming interface that links your systems together and makes data transfer easy.

Wouldn’t it be great if you could synchronize properties, tasks, and other information between different applications? That’s exactly what the onOffice API is for.
Our API connects external programs to onOffice enterprise, allowing you to seamlessly process your data across various systems.
From forms on your website to external programs, the possibilities are nearly endless!
Connecting your systems effortlessly.
Synchronize various applications in real-time.
Integrate your existing software structure with onOffice.
Efficiently manage multiple data sources.
Let multiple systems handle your business processes and tasks.

Attention developers and tech-savvy real estate agents: the onOffice API Documentation explains requests and responses with code examples.
Discover how easy it is to connect your systems with onOffice enterprise. Test all functions for 7 days now – free of charge and without obligation.



Typically, you need to process data within the application where it was originally entered, even if you need that information elsewhere. With the onOffice API, you don’t need to switch between different applications anymore.
For example, when customers enter their contact details into an API form on your website, these details are immediately updated in onOffice via the API. There’s no delay in data transmission.
Manage your data exactly where you need it.

We bridge the gap between clients and agents through the extensive API of onOffice enterprise. The synergy between leading real estate software and digital offerings for end customers puts us in a prime market position.
Wolfram Gast, Chief Digital Officer and Member of the Executive Board

The onOffice interface was adapted to the specifics of foreclosure auctions. By integrating an external provider via the API, a specialized valuation tool was incorporated into the software.
Stefan Butgereit, Managing Director
The onOffice API enables seamless data exchange between onOffice enterprise and external applications. You can use it, for example, to automatically synchronize properties , tasks and other information between different systems. This allows you to exchange data with your website, forms, or other software solutions.
With the onOffice API, your applications are always up-to-date because data is synchronized in real time. You can work cross-platform and more efficiently, centrally manage multiple data sources, and automate typical workflows across various systems.
The API is used in a variety of ways: Transfer website form data directly into onOffice enterprise, integrate a prospect finder or link your newsletter system. This way, you avoid duplicate data maintenance and ensure that all relevant information is synchronized and up-to-date at all times.
The entire onOffice Marketplace on our API interface. Here are three practical examples.

Using the API, you can directly transfer information from forms on your website to onOffice, such as forms with fields for agreeing to the terms and conditions. When a customer fills out the form, the information is transferred to onOffice via the API and stored there, for example, noting that they agreed to the terms and conditions. Thanks to this automated transfer, your database is always up to date.

A lead finder on your website shows potential clients that you have the right prospects for their property. The owner enters the values of their property into a form on your website. The information is transmitted to onOffice via the API and matched with your prospects’ search criteria. The results are then sent back to the website via the API. The result could be the number of or a list of suitable prospects and their search criteria. This way, the owner gets an overview of how many buyers from your pool are suitable for their property and can gauge the potential success of the marketing effort.

If you use a tool for your newsletter marketing, you can connect it to onOffice via the API. When a recipient unsubscribes from the newsletter or updates their information, the newsletter system sends the updated data back to onOffice. This way, you don’t have to maintain the data separately in two applications, and you are always up to date.


Link onOffice enterprise with applications and end devices.
Numerous external providers directly integrated into onOffice enterprise.
It’s a match: Your telephone system and onOffice enterprise – for calls without extra effort.