One Unified API for all your ERP and accounting integrations.
The last integration you'll build. Connect once and get normalized data, unified authentication, webhooks and logging out of the box.
DORA-ready
Provet
ProvetYou build one integration to Maesn. We do the rest.
One Unified REST API for dozens of ERP and accounting systems. Fully managed, language-agnostic and easy to integrate, with SDKs, sandboxes and quickstarts included.
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curl --request GET \--url https://api.maesn.dev/auth/{TARGET_SYSTEM} \--header 'X-API-KEY: <x-api-key>'
ERP and accounting only. The depth others can't deliver.
This depth is possible because our team comes from enterprise software, certified SAP and ERP veterans who have built software used by millions.
Deepest integrations
We don’t just match endpoints. We cover the full depth of each system: more use cases, more data points, more objects.
Broadest coverage where it counts
The ERP and accounting systems your customers actually use.
Exclusive endpoints
Endpoints for real use cases, not just basic data access.
The depth extends into the technology itself: rate limits, payloads, token lifecycles and response formats.
Maesn's engineering moat is a set of unifications.
One common data model
Responses, formats and structures fully normalized, so every system behaves identically. Where native endpoints fall short, Maesn fills the gap through background multi-calling.
{"object": "invoice","id": "inv_8842","contact": { "id": "cus_204", "name": "ACME GmbH" },"currency": "EUR","lines": [{ "description": "Consulting", "quantity": 4 }]}
Value for every part of your team.
Build in days, not months.
Enterprise-grade security and compliance are our foundation.
Built and hosted in Germany, with all infrastructure in Europe. Maesn processes API calls in real time without storing customer data and is ISO 27001 certified, GDPR compliant and DORA-ready.
MADE & HOSTEDIN GERMANYDORA-
ready
Get certified integrations and marketplace listings with Maesn.
Your customer stays in the spotlight and Maesn stays in the background. The app listing and connect flow run under your brand, so you get the marketing and the halo effect.
Your own marketplace listing
A certified app listing in the ERP and accounting marketplaces, published under your brand.
Your brand on connect
Your name, not ours, is shown when the end-customer connects their accounting or ERP system.
Embedded auth flow
The authentication flow runs fully inside your own UI, so it feels like a direct integration.
Marketing and halo effect
Co-marketing with the target systems puts your brand in front of their customers.
Your partner for reliable and scalable integrations.
HubSpot relies on Maesn for German accounting connectivity.
“We integrate German accounting systems and rely on Maesn as a trusted enabler, ensuring seamless data flow, full compliance, stronger partnerships and efficient, reliable financial processes that support our growth.”
Tipalti realizes their European integrations via Maesn.
“Maesn gives us seamless ERP connectivity across Benelux and DACH, critical for our AP automation and European expansion.”
Paywise automates debt collection with Maesn.
“With Maesn, we enable our customers to connect their accounting and ERP systems directly within Paywise, making debt collection seamless, automated and significantly more efficient.”
Rally transformed its DATEV integration with Maesn.
“Maesn completely transformed how we integrate with DATEV. What would have been a complex direct integration became a smooth, intuitive process thanks to their REST API and DATEV sandbox.”
Finto shipped a production-ready DATEV integration in days.
“Maesn enabled us to launch a production-ready DATEV integration within days, giving our AI structured financial data and our customers a smooth onboarding experience.”
Built to change how integrations work.
Driven by product thinking
At Maesn, product comes first. We build integrations with deep thinking and high standards, because integration quality directly shapes your product value.
More about usYou were thinking about building it yourself?
“We could build this ourselves” is the most common thought and the most expensive one. Doing it yourself is enormously expensive in engineering effort and never-ending maintenance. With Maesn, it is not.
Maesn handles all of it, everything you'd have to worry about without Maesn.
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