Manage Invoice Ninja clients, invoices, quotes, expenses, tasks and projects. Hosted by usefulapi — connect from Claude, ChatGPT, Cursor, or any MCP client.
Team and Enterprise: an Owner adds the connector for the organization first.
Run this command, then run /mcp in Claude Code to log in:
Add to Cursor or add this to ~/.cursor/mcp.json:
{
"mcpServers": {
"invoice-ninja": {
"url": "https://invoice-ninja.usefulapi.io/mcp"
}
}
}Add to VS Code or add this to .vscode/mcp.json:
{
"servers": {
"invoice-ninja": {
"type": "http",
"url": "https://invoice-ninja.usefulapi.io/mcp"
}
}
}No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.
Run these commands. The second one opens the login page:
Other MCP clients (Windsurf, Cline, Zed and more): add the URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser. Do not add an Authorization header: see 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.
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.
Turn on the Invoice Ninja connector, then ask in plain words. The AI picks the tools.
| Tool | Type | What it does |
|---|---|---|
invoiceninja_list_clients | read | List clients List clients with balances and contacts, optionally searched by name, email or number. Invoice Ninja: GET /api/v1/clients. |
invoiceninja_get_client | read | Get one client Fetch one client by id, with contacts, address, balance and paid-to-date. Invoice Ninja: GET /api/v1/clients/{id}. |
invoiceninja_list_invoices | read | 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. Invoice Ninja: GET /api/v1/invoices. |
invoiceninja_get_invoice | read | Get one invoice Fetch one invoice by id — line items, totals, balance, dates, status and invitations. Invoice Ninja: GET /api/v1/invoices/{id}. |
invoiceninja_list_quotes | read | List quotes List quotes (estimates), filterable by client and quote status. Invoice Ninja: GET /api/v1/quotes. |
invoiceninja_get_quote | read | Get one quote Fetch one quote by id — line items, totals, status and the invoice it was converted to (invoice_id), if any. Invoice Ninja: GET /api/v1/quotes/{id}. |
invoiceninja_list_products | read | List products List products / services in the catalog with price, cost and default taxes. Invoice Ninja: GET /api/v1/products. |
invoiceninja_list_payments | read | 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. Invoice Ninja: GET /api/v1/payments. |
invoiceninja_list_expenses | read | List expenses List expenses, filterable by client and invoicing/payment state. Invoice Ninja: GET /api/v1/expenses. |
invoiceninja_list_vendors | read | List vendors List vendors (suppliers) with contacts and address. Invoice Ninja: GET /api/v1/vendors. |
invoiceninja_list_tasks | read | List tasks List tasks / time entries with their time_log, duration, rate and linked client, project and invoice. Invoice Ninja: GET /api/v1/tasks. |
invoiceninja_list_projects | read | List projects List projects with client, budgeted hours, task rate, current hours and due date. Invoice Ninja: GET /api/v1/projects. |
invoiceninja_list_recurring_invoices | read | List recurring invoices List recurring invoice schedules with frequency, next send date and remaining cycles. Read-only. Invoice Ninja: GET /api/v1/recurring_invoices. |
invoiceninja_create_client | write | Create a client Create a client, optionally with contacts. Give at least a name or one contact. Invoice Ninja: POST /api/v1/clients. |
invoiceninja_update_client | write | Update a client Update a client's details; only the fields you pass change. Passing contacts replaces the contact list. Invoice Ninja: PUT /api/v1/clients/{id}. |
invoiceninja_create_invoice | write | Create an invoice Create a DRAFT invoice for a client. It is not sent or emailed — use invoiceninja_mark_invoice_sent or invoiceninja_email_invoice afterwards. Invoice Ninja: POST /api/v1/invoices. |
invoiceninja_update_invoice | write | Update an invoice Edit an invoice; only the fields you pass change, but line_items (if passed) replace every existing line. Does not send anything. Invoice Ninja: PUT /api/v1/invoices/{id}. |
invoiceninja_mark_invoice_sent | write | Mark an 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. Invoice Ninja: GET /api/v1/invoices/{id}/mark_sent. |
invoiceninja_email_invoice | write | Email an invoice to the client 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. |
invoiceninja_create_quote | write | Create a quote Create a DRAFT quote (estimate) for a client. Nothing is emailed. Invoice Ninja: POST /api/v1/quotes. |
invoiceninja_convert_quote_to_invoice | write | Convert a quote to an invoice Convert a quote into a new invoice (the quote is marked converted and links to it). Returns the new invoice. Invoice Ninja: GET /api/v1/quotes/{id}/convert_to_invoice. |
invoiceninja_create_expense | write | Create an expense Log an expense, optionally tied to a vendor, client or project and flagged to be re-invoiced. Invoice Ninja: POST /api/v1/expenses. |
invoiceninja_create_task | write | Create a task / log time Create a task, optionally with logged time entries, for a client or project. Invoice Ninja: POST /api/v1/tasks. |
invoiceninja_create_project | write | Create a project Create a project for a client, with an optional hourly task rate, budget and due date. Invoice Ninja: POST /api/v1/projects. |
invoiceninja_usage_status | Usage status (free-tier meter) 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. | |
invoiceninja_request_feature | Request a missing 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. | |
invoiceninja_upgrade | Upgrade to Pro (unlimited*) Get Pro: unlimited tool calls (fair use limit: 10,000 a month) on Invoice Ninja (the free tier caps monthly usage). Plans: "monthly" — $9/month; "yearly" — $90/year (2 months free). Cancel any time: Pro then runs to the end of the paid period, so it also suits a one-time job. *A fair use limit applies. For heavy use (near Pro's limit): "plus" or "plus_yearly" — Pro+, $19/month or $190/year, unlimited tool calls (fair use limit: 100,000 a month); 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). Otherwise returns a short link to open in your browser (it opens Stripe Checkout); after payment the account upgrades automatically. Does not count against the meter. | |
invoiceninja_cancel_subscription | Cancel the Pro 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. |
| Plan | Price | Limit |
|---|---|---|
| Free | $0 | 50 tool calls / month |
| Proper user | $9/mo · $90/yr | Unlimited* |
*Pro fair use limit: 10,000 tool calls a month on this server. For more, write to [email protected].
Pro covers this Invoice Ninja server only. Subscribe with invoiceninja_upgrade (it returns a Stripe Checkout link). Cancel any time with invoiceninja_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running invoiceninja_upgrade before then undoes the cancel. Or write to [email protected].
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.
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.
The login page asks for your Invoice Ninja API token. See Before you connect for where to find it.
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.
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.
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.
The Free plan gives 50 tool calls / month. Pro costs $9/mo or $90/yr, with unlimited tool calls (fair use limit: 10,000 tool calls a month), for this Invoice Ninja server only. Cancel any time: Pro then runs to the end of the paid period. Run invoiceninja_usage_status to see how many calls you used.
Ask the AI to run invoiceninja_upgrade: it returns a Stripe Checkout link. To cancel, run invoiceninja_cancel_subscription. Pro continues to the end of the paid period.
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.
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.