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Operate As

Integration

maesn

Unified accounting API for European tools. Your client pastes their maesn key once, and your agent or your code works with their access.

Accounting

About maesn

Through Operate As, your agent, n8n workflow or code works in maesn with your client's own access. Your client pastes their API key from maesn once. We store it encrypted, so it never sits in an email or a shared doc. Your agent reaches any endpoint of maesn's API through the request tool, with the client's access attached.

Common uses in Accounting

  • Create invoices and record payments
  • Match transactions and chase overdue bills
  • Pull numbers for a monthly report

maesn

maesn · Accounting

API key

Unified accounting API for European tools

The client pastes their API key from maesn's settings. We store it encrypted.

Tested against maesn's live API.

Building with maesn? The docs have setup steps and code for every tool.

Open the maesn docs

Tools

Your agent calls any endpoint of maesn's API with the request tool, with the client's access attached.

Base URL for request

https://api.maesn.dev

  • request

    HTTPS ANY /v1/clients/{clientId}/maesn/{path}

    Any endpoint of maesn's own API, with the client's access attached.

    servicestringrequired
    This service: maesn
    methodstringrequired
    GET, POST, PUT, PATCH or DELETE
    pathstringrequired
    The path under https://api.maesn.dev
    queryobjectoptional
    Query parameters
    bodyobjectoptional
    A JSON body

Over MCP every tool also takes client_id, from list_clients. Over HTTPS send it as clientId to https://api.operate.as/v1.

What the client approves

  • Use the maesn key you paste, with only the access you gave that key

Related

More in Accounting

Browse every service

Get started

Send your next client one link

Add a client, select the services, copy the link. You'll get an email the moment their access is ready. Start free, no card required. Paid plans are one flat monthly price, and a busy month never takes your agents offline.

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