Invoice Ninja MCP server

Manage Invoice Ninja clients, invoices, quotes, expenses, tasks and projects. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.

Connect Invoice Ninja50 free tool calls a month

What can I ask?

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

What you can do with Invoice Ninja in Claude and ChatGPT

For freelancers and small businesses who bill clients with Invoice Ninja.

Find overdue invoices and what each client owes

The AI lists invoices by payment status (paid, unpaid or overdue) and by client, and shows the balances.

Review payments, quotes and recurring invoices

The AI lists payments received with the invoices they paid, open quotes with their clients, and recurring invoice schedules with the next send date.

Create a draft invoice or quote for a client

The AI creates a draft invoice or quote with line items. Nothing is sent or emailed.

Changes data

Send an invoice or convert a quote to an invoice

The AI emails an invoice to the client's contacts, marks it sent without email, or converts a quote into an invoice.

Changes data

Track time, expenses and projects

The AI lists tasks with time logs, expenses, vendors and projects with budgeted hours, so you can see the work and costs.

Log time, an expense or a new project

The AI creates a task with time entries, an expense that can be re-invoiced, or a project with a rate, budget and due date.

Changes data

How do I connect Invoice Ninja?

Before you connect

The login page asks for your Invoice Ninja API token.

Optional: Instance URL (optional — self-hosted only).

Create a token in Invoice Ninja → Settings → Account Management → Integrations → API tokens. On hosted invoicing.co the API needs the Pro or Enterprise plan. Leave the instance URL blank for hosted invoicing.co; for a self-hosted install enter its public https:// address. Your token 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 Invoice Ninja and this URL, then click Add:
    https://invoice-ninja.usefulapi.io/mcp
  3. Claude opens the login page: enter your Invoice Ninja API token.
  4. In a chat, click + → Connectors and turn on Invoice Ninja.

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 Invoice Ninja and this URL, choose OAuth as the authentication, confirm the warning and create it:
    https://invoice-ninja.usefulapi.io/mcp
  3. ChatGPT opens the login page: enter your Invoice Ninja API token.
  4. In Plugins, install Invoice Ninja, 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 invoice-ninja https://invoice-ninja.usefulapi.io/mcp

Cursor

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

{
  "mcpServers": {
    "invoice-ninja": {
      "url": "https://invoice-ninja.usefulapi.io/mcp"
    }
  }
}

VS Code

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

{
  "servers": {
    "invoice-ninja": {
      "type": "http",
      "url": "https://invoice-ninja.usefulapi.io/mcp"
    }
  }
}

Codex

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

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

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://invoice-ninja.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 Invoice Ninja API token. 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 Invoice Ninja server only. Ask your AI to run invoiceninja_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 invoiceninja_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 invoiceninja_upgrade before then undoes the cancel. Or write to support@usefulapi.io.

Tools 28

Show all 28 tools (the AI picks them for you)

Read only · 13

  • List clientsinvoiceninja_list_clients
    List clients with balances and contacts, optionally searched by name, email or number.
  • Get one clientinvoiceninja_get_client
    Fetch one client by id, with contacts, address, balance and paid-to-date.
  • List invoicesinvoiceninja_list_invoices
    List invoices, filterable by client and payment status (paid / unpaid / overdue). status_id on each invoice: 1 draft, 2 sent, 3 partial, 4 paid, 5 cancelled, 6 reversed.
  • Get one invoiceinvoiceninja_get_invoice
    Fetch one invoice by id — line items, totals, balance, dates, status and invitations.
  • List quotesinvoiceninja_list_quotes
    List quotes (estimates), filterable by client and quote status.
  • Get one quoteinvoiceninja_get_quote
    Fetch one quote by id — line items, totals, status and the invoice it was converted to (invoice_id), if any.
  • List productsinvoiceninja_list_products
    List products / services in the catalog with price, cost and default taxes.
  • List paymentsinvoiceninja_list_payments
    List payments received, with amount, date, refunded/applied totals and the invoices each was applied to (paymentables). Read-only: this server never records or refunds payments.
  • List expensesinvoiceninja_list_expenses
    List expenses, filterable by client and invoicing/payment state.
  • List vendorsinvoiceninja_list_vendors
    List vendors (suppliers) with contacts and address.
  • List tasksinvoiceninja_list_tasks
    List tasks / time entries with their time_log, duration, rate and linked client, project and invoice.
  • List projectsinvoiceninja_list_projects
    List projects with client, budgeted hours, task rate, current hours and due date.
  • List recurring invoicesinvoiceninja_list_recurring_invoices
    List recurring invoice schedules with frequency, next send date and remaining cycles. Read-only.

Changes data · 11

  • Create a clientinvoiceninja_create_client
    Create a client, optionally with contacts. Give at least a name or one contact.
  • Update a clientinvoiceninja_update_client
    Update a client's details; only the fields you pass change. Passing contacts replaces the contact list.
  • Create an invoiceinvoiceninja_create_invoice
    Create a DRAFT invoice for a client. It is not sent or emailed — use invoiceninja_mark_invoice_sent or invoiceninja_email_invoice afterwards.
  • Update an invoiceinvoiceninja_update_invoice
    Edit an invoice; only the fields you pass change, but line_items (if passed) replace every existing line. Does not send anything.
  • Mark an invoice sentinvoiceninja_mark_invoice_sent
    Mark a draft invoice as sent WITHOUT emailing it. This moves it out of draft and adds its amount to the client's balance.
  • Email an invoice to the clientinvoiceninja_email_invoice
    OUTWARD-FACING: sends a real email with the invoice to the client's invited contacts, and marks the invoice sent. Cannot be unsent — confirm with the user first. Invoice Ninja: POST /api/v1/invoices/bulk with action=email.
  • Create a quoteinvoiceninja_create_quote
    Create a DRAFT quote (estimate) for a client. Nothing is emailed.
  • Convert a quote to an invoiceinvoiceninja_convert_quote_to_invoice
    Convert a quote into a new invoice (the quote is marked converted and links to it). Returns the new invoice.
  • Create an expenseinvoiceninja_create_expense
    Log an expense, optionally tied to a vendor, client or project and flagged to be re-invoiced.
  • Create a task / log timeinvoiceninja_create_task
    Create a task, optionally with logged time entries, for a client or project.
  • Create a projectinvoiceninja_create_project
    Create a project for a client, with an optional hourly task rate, budget and due date.

Your usefulapi plan · 4

  • Usage status (free-tier meter)invoiceninja_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 featureinvoiceninja_request_feature
    Tell usefulapi that the user needs something the Invoice Ninja 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+invoiceninja_upgrade
    Get a paid plan for Invoice Ninja (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 subscriptioninvoiceninja_cancel_subscription
    Cancel the caller's Invoice Ninja 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 invoiceninja_upgrade later to undo the cancel before the period ends. Does not count against the meter.

FAQ

What can I do with Invoice Ninja in Claude or ChatGPT?

Find overdue invoices and what each client owes. Review payments, quotes and recurring invoices. Create a draft invoice or quote for a client. Send an invoice or convert a quote to an invoice. Track time, expenses and projects. Log time, an expense or a new project. See what you can do for the details.

Is this an official Invoice Ninja product?

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

Can I connect Invoice Ninja 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 Invoice Ninja API token. See Before you connect for where to find it.

Do I put my Invoice Ninja 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 Invoice Ninja API token. 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 Invoice Ninja credentials?

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

Can the AI change my Invoice Ninja data?

Yes, if you approve it. 11 of the 24 Invoice Ninja tools can create or change data. The other 13 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 Invoice Ninja server only. Cancel any time: your paid plan then runs to the end of the paid period. Run invoiceninja_usage_status to see how many calls you used.

How do I subscribe or cancel?

Ask the AI to run invoiceninja_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 invoiceninja_cancel_subscription. Your paid plan continues to the end of the paid period.

What if a Invoice Ninja tool that I need is missing?

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