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Fakturownia (InvoiceOcean) API and MCP server

Fakturownia's API covers invoices, clients and payments, but it takes an API token and code you write and host. Sign in to Fakturownia 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 Fakturownia (InvoiceOcean).

Fakturownia (InvoiceOcean) has no API for this. So we run one for you.

Fakturownia (InvoiceOcean)'s own API, a GitHub MCP server and Cotlet compared
What you need Fakturownia (InvoiceOcean)'s APIGitHub MCP serverCotlet
Use without an API key or code No Partly Yes, 14 tools
Acts as you, signed in 24/7 No No Yes, Cloud Browser
Fixed for you when Fakturownia (InvoiceOcean) changes N/A No Yes, tested every 6h
Runs with your laptop off N/A No Yes, hosted

Checked Oct 14, 2026. Sources: Fakturownia API documentation (GitHub) · Fakturownia API: KSeF integration guide · Fakturownia: AI assistant over MCP (read-only) · InvoiceOcean pricing (API on every plan)

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

  1. 01Sign in to Fakturownia (InvoiceOcean) in your own Cloud Browser

  2. 02Connect it for your agents

  3. 03Cotlet keeps it signed in and working

How do I connect Fakturownia (InvoiceOcean) 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. Fakturownia (InvoiceOcean) 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/fakturownia with its own method and path, such as POST /api/v1/fakturownia/clients/{client_id}/invoices, with the same API key. Our open-source repo has ready scripts to start from.

REST API docs

What can the Fakturownia (InvoiceOcean) API and MCP server do?

14 tools on your own Fakturownia (InvoiceOcean) account. Agents call them as operations of the MCP tools fakturownia_read and fakturownia_write; scripts call each one at its own REST endpoint, with the same inputs and answers.

API reference
Fakturownia (InvoiceOcean) tools in Cotlet's MCP server and REST API
Tool What it does Access
list_invoices Sales or cost invoices for a period, with status, totals and due date. read
get_invoice One invoice with its line items, buyer, payments and KSeF fields. read
list_clients Clients, searchable by name, email, short name or tax number. read
list_products Your product and service list with price, VAT rate and unit. read
list_payments Payments recorded in Fakturownia, with the invoices they cover. read
get_invoice_pdf The invoice as a PDF file, base64 encoded. read
get_ksef_status Where an invoice stands in KSeF: not sent, processing, accepted or an error. read
create_client Add a client to your Fakturownia client list. write
create_invoice Issue an invoice for a client with products or free lines. writeasks first
send_invoice_email Email an invoice to the client, with the PDF attached. writeasks first
mark_invoice_paid Set an invoice status, for example paid, without recording a transfer. writeasks first
record_payment Record a payment and attach it to one or more invoices. writeasks first
send_invoice_to_ksef Send one invoice to the Polish KSeF e-invoicing system. writeasks first
cancel_invoice Cancel an issued invoice with a reason. Cannot be undone. writeasks first

Scroll the table for all 14 tools.

Ask in plain words. Your agent does the rest.

All Fakturownia (InvoiceOcean) use cases

Is it safe to connect Fakturownia (InvoiceOcean)?

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 Fakturownia (InvoiceOcean) 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 Fakturownia (InvoiceOcean) 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 Fakturownia (InvoiceOcean) have an API?

Yes. Fakturownia has a documented REST API that creates invoices, clients and payments, sends invoices by email and sends them to KSeF (checked 14 Oct 2026). Its official MCP server is read-only, so an agent cannot issue, send or pay anything through it. Every write needs a raw API token that you create in your account settings and keep yourself, per account.

How do I get access?

Sign up free, open Fakturownia (InvoiceOcean) 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 Fakturownia (InvoiceOcean) yourself and press Enable for agents. Your agent's calls go through it, from its IP with its cookies, so Fakturownia (InvoiceOcean) 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: create_invoice, send_invoice_email, mark_invoice_paid, record_payment, send_invoice_to_ksef, cancel_invoice wait for your OK by default. You can switch that off per tool for scheduled runs.

Can my agent send an invoice to KSeF?

Yes, if KSeF is already connected in your account. send_invoice_to_ksef sends one invoice after your OK, and get_ksef_status returns the KSeF number or the error. Fakturownia sends automatically only for the buyer groups chosen in its KSeF settings, so foreign companies still need a manual send.

Should I use a Fakturownia (InvoiceOcean) 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 Fakturownia (InvoiceOcean) 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 Fakturownia (InvoiceOcean)?

No. Cotlet is independent and not affiliated with Fakturownia (InvoiceOcean).

Give your agent access to Fakturownia (InvoiceOcean).

Free 7-day trial with 2,000 credits, no card needed.

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