Facturalia MCP server

Create invoices and credit notes; check whether invoices are sent and paid in Facturalia. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.

Connect FacturaliaFree 50 tool calls / monthPro $9/mo · $90/yr · pricing8 tools

What can I ask?

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

What you can do with Facturalia in Claude and ChatGPT

For Belgian businesses that issue sales invoices and credit notes with Facturalia.

Create a sales invoice from line data

Give the customer and the invoice lines. The invoice is created in the live account and is not e-mailed to the customer.

Changes data

Create a credit note for a customer

Give the customer and the credit note lines. The credit note is created in the live account and is not e-mailed.

Changes data

Check whether an invoice was sent and paid

Enter the invoice number. Read whether the invoice was sent and whether it was paid.

Check the paid status of a credit note

Enter the credit note number to read whether the credit note was paid.

How do I connect Facturalia?

Before you connect

The login page asks for your Facturalia live API key.

Create it in Facturalia → Extra → Modules → API. Keys look like fac_live_…. 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

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

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 Facturalia and this URL, choose OAuth as the authentication, confirm the warning and create it:
    https://facturalia.usefulapi.io/mcp
  3. ChatGPT opens the login page: enter your Facturalia live API key.
  4. In Plugins, install Facturalia, 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 facturalia https://facturalia.usefulapi.io/mcp

Cursor

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

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

VS Code

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

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

Codex

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

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

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://facturalia.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 Facturalia live 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

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 Facturalia server only. Ask your AI to run facturalia_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 facturalia_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 facturalia_upgrade before then undoes the cancel. Or write to [email protected].

Tools 8

Show all 8 tools (the AI picks them for you)

Read only · 2

  • Get invoice statusfacturalia_get_invoice_status
    Get the sent and paid status of one invoice by its number.
  • Get credit note statusfacturalia_get_credit_note_status
    Get the paid status of one credit note by its number.

Changes data · 2

  • Create an invoicefacturalia_create_invoice
    Create a sales invoice in the live Facturalia account from customer and line data. It creates a real invoice that counts toward the account's invoices; it is not sent by e-mail (autosend is not offered). Send external_id so a retry does not create a second invoice.
  • Create a credit notefacturalia_create_credit_note
    Create a credit note in the live Facturalia account from customer and line data. It creates a real document; it is not sent by e-mail (autosend is not offered). Send external_id so a retry does not create a second credit note.

Your usefulapi plan · 4

  • Usage status (free-tier meter)facturalia_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 featurefacturalia_request_feature
    Tell usefulapi that the user needs something the Facturalia 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+facturalia_upgrade
    Get a paid plan for Facturalia (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 (needs confirm: true; the price difference for the rest of the period is charged at once). 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 subscriptionfacturalia_cancel_subscription
    Cancel the caller's Facturalia 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 facturalia_upgrade later to undo the cancel before the period ends. Does not count against the meter.

FAQ

What can I do with Facturalia in Claude or ChatGPT?

Create a sales invoice from line data. Create a credit note for a customer. Check whether an invoice was sent and paid. Check the paid status of a credit note. See what you can do for the details.

Is this an official Facturalia product?

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

Can I connect Facturalia 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 Facturalia live API key. See Before you connect for where to find it.

Do I put my Facturalia 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 Facturalia live 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 Facturalia credentials?

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

Can the AI change my Facturalia data?

Yes, if you approve it. 2 of the 4 Facturalia tools can create or change data. The other 2 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 Facturalia server only. Cancel any time: your paid plan then runs to the end of the paid period. Run facturalia_usage_status to see how many calls you used.

How do I subscribe or cancel?

Ask the AI to run facturalia_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 facturalia_cancel_subscription. Your paid plan continues to the end of the paid period.

What if a Facturalia tool that I need is missing?

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