# Maesn — the Unified API for ERP and accounting integrations in Europe > Generated from the site's own data (scripts/gen-llms.mjs). Do not edit by hand: > the system, feature and use-case lists are derived, so they cannot fall behind the site. ## What is Maesn? Maesn is a Unified API for ERP and accounting integrations, built and hosted in Germany. Software teams connect once to Maesn and reach 30+ European ERP and accounting systems through a single normalised REST API, without building or maintaining an integration per system. Maesn is ISO 27001 certified, GDPR compliant and hosted exclusively in Germany. ## Who is Maesn for? Product and engineering teams at SaaS companies, enterprises and service providers who need to offer reliable ERP and accounting integrations to their customers. Go-to-market teams use it to shorten sales cycles and enter vendor marketplaces; customer success teams use it to remove manual data exchange. ## Core value proposition - One normalised REST API across 30+ European ERP and accounting systems - A common data model, so every system answers in the same shape - Unified authentication across API keys, OAuth, database credentials and 2FA - One event model, including systems without native webhooks - Request and response logging across every connected system - Authenticated passthrough and raw data access for non-standard endpoints - Custom fields and objects beyond the common data model - Multi-company support out of the box - API changes and breaking vendor updates are absorbed by Maesn ## Product features (10) - [Common Data Model](https://www.maesn.com/features/common-data-model/): One normalised schema across every system you connect. - [Unified Authentication](https://www.maesn.com/features/unified-authentication/): Every auth method and multi-company flow, abstracted. - [Unified Pagination & Filtering](https://www.maesn.com/features/unified-pagination-filtering/): One way to filter, order and page results everywhere. - [Unified Webhooks](https://www.maesn.com/features/unified-webhooks/): One event model, even for systems without native webhooks. - [Unified Logging & Monitoring](https://www.maesn.com/features/unified-logging-monitoring/): Every request, response and webhook, logged in one place. - [Unified Error Handling](https://www.maesn.com/features/unified-error-handling/): Predictable errors and graceful third-party outages. - [Asynchronous Processing](https://www.maesn.com/features/asynchronous-processing/): Send high volumes without minding each system's limits. - [Customisation Handling](https://www.maesn.com/features/customisation-handling/): Reach any field or object beyond the common data model. - [Idempotency](https://www.maesn.com/features/idempotency/): Retry a timed-out write without creating a duplicate. - [MCP Server](https://www.maesn.com/features/mcp-server/): One MCP interface AI assistants read and write through. - [All features](https://www.maesn.com/features/) ## Supported integrations (30+) The catalogue covers 30+ European ERP and accounting systems. Listed below are the 31 that have a page of their own today; the remainder connect through the same unified API and are described on the integrations overview. - [DATEV Unternehmen Online](https://www.maesn.com/integrations/datev/unternehmen-online/) - [DATEV Rechnungswesen](https://www.maesn.com/integrations/datev/rechnungswesen/) - [sevdesk](https://www.maesn.com/integrations/sevdesk/) - [Lexware Office](https://www.maesn.com/integrations/lexware-office/) - [BuchhaltungsButler](https://www.maesn.com/integrations/buchhaltungsbutler/) - [Xentral](https://www.maesn.com/integrations/xentral/) - [Weclapp](https://www.maesn.com/integrations/weclapp/) - [bexio](https://www.maesn.com/integrations/bexio/) - [Abacus](https://www.maesn.com/integrations/abacus/) - [Exact Online](https://www.maesn.com/integrations/exact-online/) - [Twinfield](https://www.maesn.com/integrations/twinfield/) - [Moneybird](https://www.maesn.com/integrations/moneybird/) - [SnelStart](https://www.maesn.com/integrations/snelstart/) - [Pennylane](https://www.maesn.com/integrations/pennylane/) - [Sage Active](https://www.maesn.com/integrations/sage/active/) - [Sage Accounting](https://www.maesn.com/integrations/sage/accounting/) - [Holded](https://www.maesn.com/integrations/holded/) - [FreeAgent](https://www.maesn.com/integrations/freeagent/) - [Xero](https://www.maesn.com/integrations/xero/) - [QuickBooks Online](https://www.maesn.com/integrations/quickbooks/) - [FreshBooks](https://www.maesn.com/integrations/freshbooks/) - [Fortnox](https://www.maesn.com/integrations/fortnox/) - [Visma e-conomic](https://www.maesn.com/integrations/visma/e-conomic/) - [Visma eAccounting](https://www.maesn.com/integrations/visma/eaccounting/) - [Spiris](https://www.maesn.com/integrations/spiris/) - [Dinero](https://www.maesn.com/integrations/dinero/) - [Dynamics 365 Business Central](https://www.maesn.com/integrations/microsoft-dynamics-365-business-central/) - [odoo](https://www.maesn.com/integrations/odoo/) - [Qonto](https://www.maesn.com/integrations/qonto/) - [Procountor](https://www.maesn.com/integrations/procountor/) - [Tripletex](https://www.maesn.com/integrations/tripletex/) - [All integrations](https://www.maesn.com/integrations/) ## Use cases - [Accounts Payable](https://www.maesn.com/use-cases/accounts-payable-automation/) - [Accounts Receivable](https://www.maesn.com/use-cases/accounts-receivable-automation/) - [Expense Management](https://www.maesn.com/use-cases/sync-expenses/) - [Payment Reconciliation](https://www.maesn.com/use-cases/payment-reconciliation/) - [Bank Feeds](https://www.maesn.com/use-cases/bank-feeds/) - [Financial Analysis & Forecasting](https://www.maesn.com/use-cases/financial-analysis-forecasting/) - [Tax Automation](https://www.maesn.com/use-cases/tax-automation/) - [Debt Collection](https://www.maesn.com/use-cases/debt-collection/) - [Business Lending / Underwriting](https://www.maesn.com/use-cases/business-lending-underwriting/) - [Factoring](https://www.maesn.com/use-cases/factoring/) - [AI Agents Enablement](https://www.maesn.com/use-cases/ai-agents-enablement/) - [Customer & Supplier Data Sync](https://www.maesn.com/use-cases/customer-supplier-data-sync/) - [Invoice Creation](https://www.maesn.com/use-cases/create-invoices/) - [Company Consolidation](https://www.maesn.com/use-cases/company-consolidation/) - [All use cases](https://www.maesn.com/use-cases/) ## By team - [Product & Engineering](https://www.maesn.com/teams/product-engineering/) - [Go-to-Market](https://www.maesn.com/teams/go-to-market/) - [Customer Success](https://www.maesn.com/teams/customer-success/) - [Financial Teams](https://www.maesn.com/teams/financial-teams/) - [All teams](https://www.maesn.com/teams/) ## By industry - [B2B Fintech](https://www.maesn.com/industries/b2b-fintech/) - [SaaS](https://www.maesn.com/industries/saas/) - [Banks & Business Lenders](https://www.maesn.com/industries/banks-business-lenders/) - [Travel Platforms](https://www.maesn.com/industries/travel-platforms/) - [Tax Advisors](https://www.maesn.com/industries/tax-advisors/) - [Enterprises](https://www.maesn.com/industries/enterprises/) - [All industries](https://www.maesn.com/industries/) ## Customers - [Agicap](https://www.maesn.com/case-studies/agicap/) - [Tipalti](https://www.maesn.com/case-studies/tipalti/) - [Clockin](https://www.maesn.com/case-studies/clockin/) - [Paywise](https://www.maesn.com/case-studies/paywise/) - [HubSpot](https://www.maesn.com/case-studies/hubspot/) - [HERO Software](https://www.maesn.com/case-studies/hero-software/) - [Rally](https://www.maesn.com/case-studies/rally/) - [Nordhealth](https://www.maesn.com/case-studies/nordhealth/) - [Immocloud](https://www.maesn.com/case-studies/immocloud/) - [Holvi](https://www.maesn.com/case-studies/holvi/) - [Lanes & Planes](https://www.maesn.com/case-studies/lanes-and-planes/) - [All case studies](https://www.maesn.com/case-studies/) ## Security and compliance - ISO 27001 certified - GDPR compliant - Built and hosted exclusively in Germany - No customer data stored: API calls are processed in real time - [Security page](https://www.maesn.com/security/) - [Trust Center](https://trust.maesn.com) ## Whitepapers - [DATEV Integration Whitepaper for Software Teams](https://www.maesn.com/whitepaper/datev-integration/) - [European ERP & Accounting Software Market Report 2025](https://www.maesn.com/whitepaper/european-erp-accounting-market/) ## Company - Headquarters: Düsseldorf, Germany - Founders: Dr. Themo Voswinckel (CEO), Marius Pohle (CRO), Lennart Svensson (CTO) - [About Maesn](https://www.maesn.com/about-us/) ## Key URLs - [Website](https://www.maesn.com) - [Developer documentation](https://docs.maesn.com) - [Pricing](https://www.maesn.com/pricing/) - [Contact](https://www.maesn.com/contact/) - [Blog](https://www.maesn.com/blog/) - [GitHub](https://github.com/maesndev) - [LinkedIn](https://www.linkedin.com/company/maesn-integration)