ePoslovanje MCP server

Validate and send e-invoices, track their status and check AMS registration in ePoslovanje. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.

Connect ePoslovanje50 free tool calls a month

What can I ask?

Turn on the ePoslovanje connector, then ask in plain words. The AI picks the tools.

Which e-invoices did we receive this month, and which are still waiting for approval?
Validate this UBL invoice before we send it to the customer.
Show the status history of invoice 1234/1/2026 sent to our buyer.
Is this customer's OIB published on the Tax Authority AMS service?

What you can do with ePoslovanje in Claude and ChatGPT

For Croatian companies that send and receive e-invoices through ePoslovanje.

Validate and send an e-invoice

Validate the UBL invoice XML against the EN16931 and CIUS-2025 rules. Then send it to the buyer. A sent invoice cannot be unsent.

Changes data

Track an invoice after it was sent

Look up the status of an invoice by its number, both OIBs and issue year. No ePoslovanje id is needed.

Review e-invoices received this month

List the incoming e-invoices by insert, modify or issue date. Open one to read its signed XML.

Approve or reject a received invoice

Set a received invoice to approved, rejected or fully paid. Only the buyer can change these statuses.

Changes data

Check whether a customer is on AMS

Check whether a company, by its OIB or GLN, is published on the Tax Authority AMS service.

How do I connect ePoslovanje?

Before you connect

The login page asks for your ePoslovanje API key.

Use the API key of your ePoslovanje account. The API reference is at doc.eposlovanje.hr. Your key is used only to call the API on your behalf and to derive a private account id; it is never shown to anyone.

Claude claude.ai · Desktop

Open Customize → Connectors, then click + Add → Add custom connector.
Enter the name ePoslovanje and this URL, then click Add:
https://eposlovanje.usefulapi.io/mcp
Claude opens the login page: enter your ePoslovanje API key.
In a chat, click + → Connectors and turn on ePoslovanje.

Team and Enterprise: an Owner adds the connector for the organization first.

ChatGPT chatgpt.com

Open Plugins, click +, then Add custom MCP server.
Enter the name ePoslovanje and this URL, choose OAuth as the authentication, confirm the warning and create it:
https://eposlovanje.usefulapi.io/mcp
ChatGPT opens the login page: enter your ePoslovanje API key.
In Plugins, install ePoslovanje, then choose it in a chat.

No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.

Claude Code

Run this command, then run /mcp in Claude Code to log in:

claude mcp add --transport http eposlovanje https://eposlovanje.usefulapi.io/mcp

Cursor

Add to Cursor or add this to ~/.cursor/mcp.json:

{
  "mcpServers": {
    "eposlovanje": {
      "url": "https://eposlovanje.usefulapi.io/mcp"
    }
  }
}

VS Code

Add to VS Code or add this to .vscode/mcp.json:

{
  "servers": {
    "eposlovanje": {
      "type": "http",
      "url": "https://eposlovanje.usefulapi.io/mcp"
    }
  }
}

Codex

Run these commands. The second one opens the login page:

codex mcp add eposlovanje --url https://eposlovanje.usefulapi.io/mcp

codex mcp login eposlovanje

Other clients

Windsurf, Cline, Zed and other MCP clients: add this URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser.

https://eposlovanje.usefulapi.io/mcp

Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your ePoslovanje API key. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.

Pricing

Plan	Price	Limit
Free	$0	50 tool calls / month
Proper user	$9/mo · $90/yr	10,000 tool calls / month
Pro+per user	$39/mo · $390/yr	100,000 tool calls / month

Each paid plan covers this ePoslovanje server only. Ask your AI to run eposlovanje_upgrade and choose Pro or Pro+, billed monthly or yearly (it returns a Stripe Checkout link). If you already have Pro, ask to change it to Pro+. The change requires your confirmation, keeps your billing interval and charges the price difference for the rest of the period immediately. Cancel any time with eposlovanje_cancel_subscription: your paid plan continues to the end of the paid period, with no refund for the current period, and asking to resume the same plan with eposlovanje_upgrade before then undoes the cancel. Or write to support@usefulapi.io.

Tools 18

Show all 18 tools (the AI picks them for you)

Read only · 12

Check service and keyeposlovanje_ping
Check that the ePoslovanje service is up and that the API key is accepted. Cheapest call.
Get account balanceeposlovanje_get_account_balance
Get the account type (Prepaid or Postpaid) and the prepaid balance, or the postpaid usage.
Get F2 fiscalization settingseposlovanje_get_f2_settings
Get the automatic fiscalization settings for incoming and outgoing invoices (F2.0).
List business unitseposlovanje_list_business_units
List the business units (poslovne jedinice) of a company by its OIB, in the format used on e-invoices.
List incoming documentseposlovanje_list_incoming_documents
List e-invoices received by the account (suppliers' invoices to us), with filters by insert, modify and issue date.
List outgoing documentseposlovanje_list_outgoing_documents
List e-invoices sent by the account (our invoices to customers), with filters by insert, modify and issue date.
Get a documenteposlovanje_get_document
Get the signed XML of one incoming or outgoing e-invoice by its ePoslovanje id. Archived documents may not be returned.
Get document statuseposlovanje_get_document_status
Get the status history (transport, business and e-reporting) of one document by its ePoslovanje id.
Look up document status by numbereposlovanje_lookup_document_status
Get the status of one invoice by its invoice number, both OIBs and the issue year (no ePoslovanje id needed).
Validate a documenteposlovanje_validate_document
Validate an e-invoice XML against the EN16931 / CIUS-2025 rules without sending it. Returns a list of errors, empty when valid. POST /api/v2/document/validate. Nothing is stored or sent.
List e-reporting requestseposlovanje_list_ereporting_requests
List the e-reporting (eIzvještavanje, Tax Authority fiscalization) requests for one invoice.
Check AMS registrationeposlovanje_check_ams
Check whether a company (by OIB or GLN) is published on the Tax Authority AMS service, so e-invoices can reach it. POST /api/v2/ams/check. Read-only lookup.

Changes data · 2

Send an e-invoiceeposlovanje_send_document
Send an UBL 2.1 Invoice or CreditNote XML to the buyer through ePoslovanje. The document is validated, signed, and queued for the buyer's intermediary. A sent invoice cannot be unsent. Each send costs about 0.08 EUR + VAT on the account. Use eposlovanje_validate_document first.
Change document status (buyer)eposlovanje_change_document_status
Set the business status of a received invoice: 5 approved, 6 rejected, 7 fully paid. Changing to rejected does not send an e-reporting request. Only the buyer can change these statuses.

Your usefulapi plan · 4

Usage status (free-tier meter)eposlovanje_usage_status
Report the caller's current usage: the plan, calls used this month, the limit of the plan (the free monthly cap or the Pro fair use limit), remaining, and whether the limit is reached. Read-only; does not count against the meter.
Request a missing featureeposlovanje_request_feature
Tell usefulapi that the user needs something the ePoslovanje tools cannot do yet (a missing tool, field or filter). Call it only when the user asks for something none of the tools can do, and tell the user that you send the request. Do not call it for errors or for normal requests. Do not include personal data, credentials or customer records. Stored with the product name and the client type (for example Claude or Cursor), without the user's account. At most 5 requests per day. Does not count against the meter.
Upgrade to Pro or Pro+eposlovanje_upgrade
Get a paid plan for ePoslovanje (the free tier caps monthly usage). Pro: 10,000 tool calls a month, for normal use — plan "monthly" ($9/month) or "yearly" ($90/year, 2 months free). Pro+: 100,000 tool calls a month, for automations and heavy use — plan "plus" ($39/month) or "plus_yearly" ($390/year). Without a plan it returns both Pro and Pro+, each with a payment link, for the user to choose; with a plan, one link. An existing Pro subscription changes to Pro+ in place: call without confirm first, as the reply states the exact charge for this account (the price difference for the rest of the period, or in a free Pro trial the full Pro+ price, as the trial ends); then call with confirm: true. Cancel any time: the plan then runs to the end of the paid period, so it also suits a one-time job. A link opens Stripe Checkout in the browser; after payment the account upgrades automatically. Does not count against the meter.
Cancel the Pro subscriptioneposlovanje_cancel_subscription
Cancel the caller's ePoslovanje Pro subscription at the end of the paid period (no refund for the current period; Pro continues until then, then the free tier applies). Requires confirm: true. Run eposlovanje_upgrade later to undo the cancel before the period ends. Does not count against the meter.

FAQ

What can I do with ePoslovanje in Claude or ChatGPT?

Validate and send an e-invoice. Track an invoice after it was sent. Review e-invoices received this month. Approve or reject a received invoice. Check whether a customer is on AMS. See what you can do for the details.

Is this an official ePoslovanje product?

No. usefulapi is an independent service. It is not affiliated with or endorsed by ePoslovanje. The server calls the ePoslovanje API with your own ePoslovanje access, so it sees only the data that your account can see.

Can I connect ePoslovanje to Claude or ChatGPT?

Yes. In Claude, add this server's URL as a custom connector. In ChatGPT, add it as a custom MCP server in Plugins. Then log in once. Cursor, VS Code, Claude Code and Codex work too. See the setup steps.

What do I need to connect?

The login page asks for your ePoslovanje API key. See Before you connect for where to find it.

Do I put my ePoslovanje key or an Authorization header in the client config?

No. Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your ePoslovanje API key. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.

How do you keep my ePoslovanje credentials?

The login stores them encrypted in the authorization grant of your connection. The server uses them to call the ePoslovanje API for you and to derive a private account id for usage metering. usefulapi does not show them on any page or in any reply. To stop all access, remove the connector and change or delete these credentials in ePoslovanje.

Can the AI change my ePoslovanje data?

Yes, if you approve it. 2 of the 14 ePoslovanje tools can create or change data. The other 12 are marked read-only. Most MCP clients ask you to approve a tool call before it runs.

What does it cost?

The Free plan gives 50 tool calls / month. Pro costs $9/mo or $90/yr, with 10,000 tool calls / month. Pro+ costs $39/mo or $390/yr, with 100,000 tool calls / month. Each subscription covers this ePoslovanje server only. Cancel any time: your paid plan then runs to the end of the paid period. Run eposlovanje_usage_status to see how many calls you used.

How do I subscribe or cancel?

Ask the AI to run eposlovanje_upgrade and choose Pro or Pro+, billed monthly or yearly: it returns a Stripe Checkout link. If you already have Pro, ask to change it to Pro+. After you confirm, your existing subscription changes in place, keeps its billing interval and charges the price difference for the rest of the period immediately. To cancel, run eposlovanje_cancel_subscription. Your paid plan continues to the end of the paid period.

What if a ePoslovanje tool that I need is missing?

Tell the AI what you wanted to do. It can send the request with eposlovanje_request_feature. We store the text with the server name, the type of AI client and the tool you tried, not with your account, and read every request when we plan new tools. You can send up to 5 requests per day.

Which AI clients can I use?

Any client that supports remote MCP servers (Streamable HTTP) with OAuth login: Claude (web and desktop), Claude Code, ChatGPT, Codex, Cursor, VS Code, Windsurf and others.

This is a Model Context Protocol endpoint — meant to be connected from an AI client, not opened in a browser. An invalid_token response at the URL is the auth gate working as designed; clients authenticate automatically.

Need a tool this server does not have, or a connection to another system? We build custom integrations and MCP servers.

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