Sync data with Abacus
Unified. Reliable. Secure.
Abacus is playing a central role in the digital infrastructure of SME. Although Abacus is most dominant in Switzerland, it is also used in parts of Liechtenstein, Austria and southern Germany.
Integrate now alongside dozens other Accounting platforms with Maesn.

Connect to Abacus and AbaConnect
Maesn supports the Abacus REST API and SOAP-based AbaConnect WebServices for the Abacus business platform and industry-specific modules such as AbaBau.

Handling of Individual Base URL
Abacus doesn’t have a universal base URL. Instead, each Abacus instance is set up with its own unique URL. With Maesn, your customers enter the URL as part of the authentication process.

Sync all objects your integration requires
Maesn enables you to integrate to Abacus and exchange all the data you need for your integration use-cases.
"Adding Qonto to our existing integrations was a piece of cake with Maesn. It is a game changer for our customers with all the integration cababilites!"

Juri Preis
CEO @ Smarta





Trusted by winning dev teams
The Maesn difference
Built faster and sell more with Maesn
Stop keeping your engineers busy with building one integration after the other. Focus on your core value: Your product.
Focus on your core product
Engineering focus
Enable your sales team to have what your leads want. Launch a portfolio of integrations in days, not quarters. Accelerate your sales.
Stop losing deals due to integrations
Sales enablement
Integrations reduce churn - dramatically. Increase your customer satisfaction with end-to-end integration to all relevant systems.
Tie your customers for ever
Higher customer retention

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Learn more about Abacus API Integration
Why companies choose Maesn
3 Reasons why it is better to integrate Abacus API with Maesn

Secure & Compliant
We have a strong relationship to Abacus. This ensures that the Maesn API is always up-to-date and any maintenance is covered on our end.

Abacus API & AbaConnect
Sync data via our REST API and forget about any system specifics or authentication challanges.

Abacus Sandbox
We provide you with everything you need, so you can focus on what counts.
You can read and write data in Abacus related to accounts, bank accounts, bills, invoices, credit notes, booking proposals, customer and supplier data, expenses, offers, payments, transactions, balances, journals, journal entries, projects and more. Learn more about how Maesn integrates to Abacus and AbaConnect.
In comparison to other Unified API vendors, you can always sync data when you want with Maesn. This can be done in real-time using webhooks or in your favorite interval like hourly, daily, weekly etc.
Maesn Unified API acts as an abstraction layer above the Abacus REST API and the AbaConnect WebServices. That enables you to connect to Abacus and all industry-specific modules as AbaBau via Maesn.
If a request fails, Maesn automatically responds with a corresponding error code. Further information can be found here.
You can monitor the status of your requests and resolve any errors using the Maesn Dashboard, which provides real-time observability and logs for better issue detection.
Setting up a Fortnox integration from scratch through Maesn typically takes anywhere from a few days to a few weeks, based on the complexity of your use-cases. The greatest thing is, once the integration is implemented, you can access more than a dozen additional accounting integrations, including DATEV, Exact Online, Qonto and Sage.
Maesn uses HTTPS for all data transfer. All connections are secured using TLS with industry-standard, state-of-the-art encryption.
We don't store any of your customer data at Maesn to be 100% GDPR compliant - our platform is hosted at Microsoft Azure in Frankfurt, Germany.Connecting Abacus via Maesn is faster, easier to maintain and the best thing: you get immediate access to dozens of other financial and ERP systems, while saving months of engineering effort spent on handling different APIs, Webservices, individual URLs and compliance edge cases across providers.
FAQ on Abacus API Integration









