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Exact Online is the leading cloud accounting platform in the Netherlands and Belgium, with significant adoption across other European markets. It covers invoicing, financial accounting, project management, and logistics, built on an OData API with a division-based architecture.
Integrate Exact Online alongside dozens of other accounting and ERP systems through Maesn Unified API.
Division-Based Architecture: Company Context Resolved Automatically
Exact Online organizes data by division, where each company environment has its own division number. Before any data request can be made, the division number must be fetched via a dedicated endpoint after authentication. Without it, no request can be routed correctly.
Maesn resolves and stores the division number per tenant during onboarding and injects it automatically into every subsequent request.
Regional Endpoints and App Centre Approval: Both Handled Before You Start
Exact Online uses country-specific base URLs across its supported markets. Apps intended for use beyond the developer's own instance must also pass Exact's internal App Centre review before onboarding customers from other tenants. Until approval, live customer onboarding is blocked.
Maesn holds an approved app registration and routes to the correct regional endpoint per tenant automatically.
OData Rate Limits Per Division: Tracking and Back-off Handled for You
Exact Online enforces daily rate limits per division ranging from 5,000 to 50,000 calls depending on the agreement, with additional minute-level limits between 60 and 300 requests per minute. For multi-tenant products syncing across many customer accounts, this requires careful request distribution across divisions.
Maesn handles rate limit tracking and back-off per division automatically.
"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
Learn more about Exact Online API Integration
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Why companies choose Maesn
3 Reasons Why It Is Better To Integrate Exact Online API With Maesn
Secure & Compliant
We have a strong relationship to Exact Online. This ensures that the Maesn API is always up-to-date and any maintenance is covered on our end.
Common Data Model
We provide a clean, unified data model that abstracts away system-specific quirks, so teams can build reliable integrations without dealing with ERP-specific complexity or workaround-heavy implementations.
Exact Online Sandbox
We provide you with everything you need, so you can focus on what counts.
BuchhaltungsButler is a cloud accounting automation platform for SMEs and accounting firms in Germany and Austria. It focuses on receipt capture, automated booking, and tax reporting. The API covers receipts, transactions, invoices, postings, and account management, and is available from the Buchhaltung Pro plan.
The main challenges are resolving the division number per tenant post-authentication before any data request, navigating country-specific regional base URLs, passing Exact's App Centre review before onboarding external customers, managing daily rate limits per division, and working with OData query syntax including the lack of full $expand support across all endpoints.
A division is the identifier for a specific company environment within Exact Online. A single Exact Online account can contain multiple divisions, each representing a separate accounting environment. Every API request must specify the correct division, which must be fetched via the /current/Me endpoint after authentication.
Until an app passes Exact's internal App Centre review, it can only connect to users from the same Exact instance that registered it. This is a significant constraint for SaaS products testing with pilot customers. Maesn holds an approved app registration, so your integration can onboard external customers from day one.
A direct Exact Online integration requires resolving division numbers post-auth, routing to country-specific base URLs, obtaining App Centre approval before external customer onboarding, managing per-division daily and per-minute rate limits, and handling OData query complexity. Maesn handles all of this through a single unified API.
Frequently Asked Questions About Exact Online Integration
