Marmin MCP server

Read invoices, credit notes, XML, Peppol status logs and business profiles in Marmin. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.

Connect Marmin50 free tool calls a month

What can I ask?

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

What you can do with Marmin in Claude and ChatGPT

For UAE finance teams and accountants that send e-invoices through Marmin.

Check the Peppol status of this week's invoices

List the invoices of a period, newest first. Read the Peppol status of each invoice to see which ones are pending, approved, rejected or failed validation.

Find out why an invoice was rejected

Open the Peppol status log of a rejected invoice to read each event and its message. Then read the invoice lines and totals to check the data.

Review the purchase invoices of one supplier

List the purchase invoices of one supplier by VAT number. Open an invoice to read its parties, lines, tax breakdown and totals.

Read the UBL XML of an e-invoice

Read the UAE e-invoice XML (UBL 2.1, PINT AE) of an invoice or credit note. Use it to check the exact e-invoice data.

Check the business profiles and their onboarding

List the business profiles of your organization with their TRN, Peppol endpoint and onboarding status. Open one profile for its address and trade license.

How do I connect Marmin?

Before you connect

The login page asks for your Environment, Client ID and Client Secret.

In Marmin open the Developer Dashboard, then Settings, then API Configuration. If you do not see that tab, ask [email protected] to enable API Integration for your organization. The secret is shown after an email code. This server signs a token request with the secret and sends it only to Marmin. Marmin sandbox and production have separate credentials.

Claude claude.ai · Desktop

  1. Open Customize → Connectors, then click + Add → Add custom connector.
  2. Enter the name Marmin and this URL, then click Add:
    https://marmin.usefulapi.io/mcp
  3. Claude opens the login page: enter your Environment, Client ID and Client Secret.
  4. In a chat, click + → Connectors and turn on Marmin.

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

ChatGPT chatgpt.com

  1. Open Plugins, click +, then Add custom MCP server.
  2. Enter the name Marmin and this URL, choose OAuth as the authentication, confirm the warning and create it:
    https://marmin.usefulapi.io/mcp
  3. ChatGPT opens the login page: enter your Environment, Client ID and Client Secret.
  4. In Plugins, install Marmin, 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 marmin https://marmin.usefulapi.io/mcp

Cursor

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

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

VS Code

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

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

Codex

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

codex mcp add marmin --url https://marmin.usefulapi.io/mcp
codex mcp login marmin

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://marmin.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 Environment, Client ID and Client Secret. 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

PlanPriceLimit
Free$050 tool calls / month
Proper user$9/mo · $90/yr10,000 tool calls / month
Pro+per user$39/mo · $390/yr100,000 tool calls / month

Each paid plan covers this Marmin server only. Ask your AI to run marmin_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 marmin_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 marmin_upgrade before then undoes the cancel. Or write to [email protected].

Tools 14

Show all 14 tools (the AI picks them for you)

Read only · 10

  • List business profilesmarmin_list_business_profiles
    List the Marmin business profiles (legal entities) of this organization, with TRN, TIN, Peppol endpoint and onboarding status. Use profile_id from the result to know which entity a document belongs to. Read-only. Limit: 30 requests/minute.
  • Get a business profilemarmin_get_business_profile
    Get one business profile by its profile_id (for example MBP-00001): legal name, TRN, trade license, Peppol endpoint, address and onboarding status. Read-only.
  • List documentsmarmin_list_documents
    List tax invoices, credit notes or proforma invoices of one kind, newest first as Marmin returns them. Each item has the number, dates, type code (380 invoice, 381 credit note, 389 self-billed, 261 self-billed credit note), parties, amounts and currency. Filter by number, party name, VAT number, status or issue date. Read-only. Limit: 60 requests/minute.
  • List document ids created on a daymarmin_list_document_uuids
    List the ids (UUIDs) of all documents of one kind that were created on one day. Use it to find new documents day by day, then read each with marmin_get_document. Read-only.
  • Get a documentmarmin_get_document
    Get one invoice, credit note or proforma invoice by id: parties, lines, tax breakdown, totals (also in AED) and meta_info.peppol_status (overall_status PENDING, APPROVED, REJECTED or VALIDATION_FAILED, with validation_results). Read-only.
  • Get the UBL XML of a documentmarmin_get_document_xml
    Get the UAE e-invoicing XML (UBL 2.1, PINT AE) of an invoice or credit note. Long XML is cut by the server's result size limit. Read-only.
  • Get the Peppol status of a documentmarmin_get_peppol_status
    Get the current Peppol transmission snapshot of an invoice or credit note: the billing leg (toC3, to the buyer's access point) and the tax-reporting leg (toC5, to the FTA), each with status and transmission errors, plus validation results. The XML copies are left out. Needs Phase 2 in the Marmin subscription (else HTTP 404). Read-only.
  • Get the Peppol status log of a documentmarmin_get_peppol_status_log
    Get the time-ordered Peppol events of a sales invoice, sales credit note or purchase credit note (DOCUMENT_CREATED, DOCUMENT_SUBMITTED, VALIDATION_SUCCESS and so on) with a message each. Use it to see why a document was rejected. The XML copies are left out. Read-only.
  • Get a register entrymarmin_get_register_entry
    Get one document register entry (the sales or purchase register of a business profile) by its id, including the linked document_id for e-invoices. Read-only.
  • Get a code listmarmin_get_codelist
    Get a Marmin code list: valid values for invoice fields, for example tax-categories, unit-of-measure-codes, uae-subdivisions (emirate codes), currencies, credit-note-reason-codes, payment-means-modes, tax-exemption-reason-codes. Read-only.

Your usefulapi plan · 4

  • Usage status (free-tier meter)marmin_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 featuremarmin_request_feature
    Tell usefulapi that the user needs something the Marmin 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+marmin_upgrade
    Get a paid plan for Marmin (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 subscriptionmarmin_cancel_subscription
    Cancel the caller's Marmin 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 marmin_upgrade later to undo the cancel before the period ends. Does not count against the meter.

FAQ

What can I do with Marmin in Claude or ChatGPT?

Check the Peppol status of this week's invoices. Find out why an invoice was rejected. Review the purchase invoices of one supplier. Read the UBL XML of an e-invoice. Check the business profiles and their onboarding. See what you can do for the details.

Is this an official Marmin product?

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

Can I connect Marmin 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 Environment, Client ID and Client Secret. See Before you connect for where to find them.

Do I put my Marmin 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 Environment, Client ID and Client Secret. 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 Marmin credentials?

The login stores them encrypted in the authorization grant of your connection. The server uses them to call the Marmin 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 Marmin.

Can the AI change my Marmin data?

All 10 Marmin tools are marked read-only.

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 Marmin server only. Cancel any time: your paid plan then runs to the end of the paid period. Run marmin_usage_status to see how many calls you used.

How do I subscribe or cancel?

Ask the AI to run marmin_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 marmin_cancel_subscription. Your paid plan continues to the end of the paid period.

What if a Marmin tool that I need is missing?

Tell the AI what you wanted to do. It can send the request with marmin_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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