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sevdesk API and MCP server

sevdesk's API is only on the Buchhaltung Pro plan, so invoices, payment reminders and receipts stay closed to every other plan. Sign in to sevdesk once in your own Cloud Browser, and your AI agent does the work there for you. The same tools work over MCP for agents and as a REST API for scripts.

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Not affiliated with sevdesk.

sevdesk has no API for this. So we run one for you.

sevdesk's own API, a GitHub MCP server and Cotlet compared
What you need sevdesk's APIGitHub MCP serverCotlet
Invoices, payment reminders, receipts No Partly Yes, 14 tools
Acts as you, signed in 24/7 No No Yes, Cloud Browser
Fixed for you when sevdesk changes N/A No Yes, tested every 6h
Runs with your laptop off N/A No Yes, hosted

Checked Oct 14, 2026. Sources: sevdesk Help: sevdesk API · sevdesk API documentation (OpenAPI) · sevdesk Help: Where do I find my API token · sevdesk pricing: plans and features

Your own Cloud Browser, on 24/7. Sign in once. We keep it connected.

  1. 01Sign in to sevdesk in your own Cloud Browser

  2. 02Connect it for your agents

  3. 03Cotlet keeps it signed in and working

How do I connect sevdesk to Claude, ChatGPT or my code?

AI agents connect over MCP, scripts call the REST API. Both reach the same 14 tools with one API key.

For AI agents: MCP

Add Cotlet to your agent once. sevdesk and every other app you connect show up as its tools.

  • Claude
  • ChatGPT
  • OpenClaw
  • Hermes
  • GrokBot
  • Cursor
  • n8n
  • Any MCP client
  1. 1

    Add Cotlet to your agent

    Claude Code
    claude mcp add --transport http cotlet \
  https://cotlet.dev/mcp/v1 \
  --header "Authorization: Bearer $COTLET_API_KEY"
    Cursor
    {
  "mcpServers": {
    "cotlet": {
      "url": "https://cotlet.dev/mcp/v1",
      "headers": {
        "Authorization": "Bearer ${COTLET_API_KEY}"
      }
    }
  }
}
    Codex
    # ~/.codex/config.toml
[mcp_servers.cotlet]
url = "https://cotlet.dev/mcp/v1"
bearer_token_env_var = "COTLET_API_KEY"

    Paste the snippet for your client. The same server and key serve every app you connect, so you do this once.

For scripts: REST API

Every tool is an endpoint under /api/v1/sevdesk with its own method and path, such as POST /api/v1/sevdesk/contacts/{contact_id}/invoice-drafts, with the same API key. Our open-source repo has ready scripts to start from.

REST API docs

What can the sevdesk API and MCP server do?

14 tools on your own sevdesk account. Agents call them as operations of the MCP tools sevdesk_read and sevdesk_write; scripts call each one at its own REST endpoint, with the same inputs and answers.

API reference
sevdesk tools in Cotlet's MCP server and REST API
Tool What it does Access
list_invoices Invoices with number, customer, status, dates and total, newest first. read
get_invoice One invoice with its positions, totals, status, e-invoice setting and linked reminders. read
list_contacts Customers, suppliers and other contacts with category and email, matched by name. read
list_vouchers Receipts (Belege) for expenses and income with supplier, amount and status, newest first. read
list_payment_accounts Your payment accounts (Zahlungskonten) with type and which one is the default. read
list_bank_transactions Transactions of one payment account with date, amount, counterparty and booked status. read
create_contact Add a customer, supplier or other contact, as a person or an organization. write
create_invoice_draft Create an invoice as a draft with its positions. Nothing is sent and the invoice number is not final. write
send_invoice Finish a draft invoice and email it to the customer, as a PDF or an e-invoice. writeasks first
create_payment_reminder Create the next reminder for an overdue invoice and email it to the customer. writeasks first
mark_invoice_paid Book a payment received on an invoice, on a payment account and date. writeasks first
cancel_invoice Cancel an unpaid invoice by creating a cancellation invoice (Stornorechnung). writeasks first
upload_receipt Upload a receipt file as a draft in Belege and return what the recognition found. write
mark_voucher_paid Mark a receipt as paid, linked to a bank transaction or booked on a payment account. writeasks first

Scroll the table for all 14 tools.

Ask in plain words. Your agent does the rest.

All sevdesk use cases

Is it safe to connect sevdesk?

You sign in yourself in your own Cloud Browser, we never save your password, and anything that reaches your readers waits for your OK. The browser profile is encrypted in the EU. Independent scanners grade cotlet.dev A+.

Security overview

How much do the sevdesk API and MCP server cost?

One price for both: a tool call costs the same over MCP or REST. Free 7-day trial with 2,000 credits, no card needed. Then one-time credit packs, no subscription, valid 12 months. Most calls use 25 credits, and your Cloud Browser uses 50 credits a day while sevdesk is enabled for agents, so 20 calls a day come to 550 credits.

See full pricing
Cotlet credit packs: price, credits and calls at 25 credits each
Credits Price, one time Calls at 25 credits Per 1,000 credits
5,000 $29 200 $5.80
15,000 $79 600 $5.27
32,000 $149 1,280 $4.66
60,000 $249 2,400 $4.15

Only successful calls use credits; failed calls and timeouts cost nothing. At a balance of 0 calls pause, never a surprise charge. Authenticate with the Authorization: Bearer header.

Questions

Does sevdesk have an API?

sevdesk has a REST API (checked 14 Oct 2026). It covers almost everything the web app does, but only on the Buchhaltung Pro plan, in Germany, on system version 2.0. Each administrator has one API token, and sevdesk publishes no MCP server.

How do I get access?

Sign up free, open sevdesk under Integrations in the console and press Request access. Your free trial starts with your account, no card needed.

Is the MCP server different from the API?

No, only the way in. Cotlet builds each integration as a REST API and puts an MCP server on top, so both have the same 14 tools, the same inputs and answers, one API key and one price. AI agents such as Claude, ChatGPT or Cursor use MCP; scripts, cron jobs and HTTP steps in n8n, Make or Zapier use the REST API.

What is the Cloud Browser?

Your own Chrome that Cotlet runs for you in the EU, around the clock. You open it from the console, sign in to sevdesk yourself and press Enable for agents. Your agent's calls go through it, from its IP with its cookies, so sevdesk sees the browser you signed in with. Password saving is off and the profile is stored encrypted with AES-256-GCM.

Can my agent act without asking me?

Not on anything that reaches other people: send_invoice, create_payment_reminder, mark_invoice_paid, cancel_invoice, mark_voucher_paid wait for your OK by default. You can switch that off per tool for scheduled runs.

Do I need the Buchhaltung Pro plan?

Not for Cotlet. sevdesk gives API access only on Buchhaltung Pro (checked 14 Oct 2026), but Cotlet works in your own sevdesk web account, so it does what your plan allows in the web app. For example, Mahnungen after the first reminder need the Buchhaltung plan or higher.

Can my agent send invoices without me checking them?

It can, but by default it does not. create_invoice_draft makes a draft that reaches nobody, and send_invoice asks for your OK on each call. Switch confirmation off for send_invoice only when you trust the brief, because sevdesk fixes the invoice number when the invoice is sent.

Should I use a sevdesk MCP server from GitHub instead?

Pick one if you want the code on your own computer and do not mind the upkeep: you install it, sign it in and fix it when sevdesk changes. Pick Cotlet if you want it hosted and kept working for you.

Can I use it in n8n, Make or Zapier?

Yes. Add https://cotlet.dev/mcp/v1 in n8n's MCP Client node, or call the REST endpoints from an HTTP step in Make or Zapier.

Who runs Cotlet?

Cotlet is run by Take Group, a Polish software company working since 2019. Take Group runs about 3,200 websites on its own systems and has its own DevOps team for infrastructure security. We built and used integrations like this inside the company for years before opening them as Cotlet.

Is Cotlet affiliated with sevdesk?

No. Cotlet is independent and not affiliated with sevdesk.

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