MCP server

FastBill MCP by usefulapi

io.usefulapi/fastbill

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Read FastBill customers, invoices, estimates, expenses; create customers, invoices, projects.

Website Source

At a glance

Type

MCP server

Publisher

usefulapi.io (verified by the MCP Registry)

Status

Working at last check

Tools

22

Token cost

About 7,160 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.fastbill]
url = "https://fastbill.usefulapi.io/mcp"

Gemini CLI

{"mcpServers":{"fastbill":{"httpUrl":"https://fastbill.usefulapi.io/mcp"}}}

Cursor

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

VS Code

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

Antigravity

agy mcp add fastbill https://fastbill.usefulapi.io/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"fastbill","server_url":"https://fastbill.usefulapi.io/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"fastbill","server_url":"https://fastbill.usefulapi.io/mcp"}

Tools

• fastbill_complete_invoice ~173 tokens
  WRITE, NOT REVERSIBLE: turn a draft invoice into a final invoice. FastBill assigns the invoice number and PDF; a final invoice can no longer be edited (it can only be canceled in FastBill). Nothing is sent to the customer. Only call this after the user confirmed the draft. invoice.complete.
• fastbill_create_article ~271 tokens
  WRITE: create a product or service (article number, title and unit price are required). article.create.
• fastbill_create_customer ~658 tokens
  WRITE: create a customer. customer_type is required; a business needs organization, a consumer needs last_name. Bank details are not accepted by this tool. FastBill does not check for duplicates, so search with fastbill_list_customers first. customer.create.
• fastbill_create_estimate ~543 tokens
  WRITE: create an estimate (quote) for a customer from line items. It is not sent. estimate.create.
• fastbill_create_invoice Moves money · ~814 tokens
  WRITE: create an invoice for a customer from line items. FastBill stores it as a draft; it gets its number and becomes final only with fastbill_complete_invoice, and it is never sent by this tool. Check the result with fastbill_get_invoice. invoice.create.
• fastbill_create_project ~226 tokens
  WRITE: create a project for a customer (name and customer are required). project.create.
• fastbill_create_time_entry ~344 tokens
  WRITE: book a work time entry on a project (customer, project and start time are required). time.create.
• fastbill_get_customer ~106 tokens
  One customer by FastBill customer id. customer.get with CUSTOMER_ID.
• fastbill_get_invoice ~120 tokens
  One invoice by FastBill invoice id, with all line items, VAT, payments and the document URL. invoice.get with INVOICE_ID.
• fastbill_list_articles ~207 tokens
  List products and services (article number, type, title, unit price, VAT, unit). article.get.
• fastbill_list_contacts ~308 tokens
  List contact persons of customers (name, position, e-mail, phone). Filter by customer, search term or contact id. contact.get.
• fastbill_list_customers ~329 tokens
  List customers (name, address, e-mail, VAT id, payment terms and bank details as stored in FastBill). Filter by search term (organization, name, address, zip, e-mail or tags), customer number, country or city. customer.get.
• fastbill_list_estimates ~282 tokens
  List estimates (quotes) with state (a created, b sent, c negotiation, d accepted, e rejected, f invoiced), totals and items. estimate.get.
• fastbill_list_expenses ~297 tokens
  List expense entries (supplier, category, net/VAT/gross, dates, document URL). Filter by invoice number or date ranges. expense.get.
• fastbill_list_invoices ~459 tokens
  List outgoing invoices, drafts and credit notes with totals, state (draft, unpaid, overdue, paid, canceled), dates and line items. Filter by customer, number, type, date ranges (invoice date, due date, paid date, last update). invoice.get.
• fastbill_list_projects ~208 tokens
  List projects (name, customer, hourly rate, VAT, start/end date). project.get.
• fastbill_list_recurring_invoices ~202 tokens
  List recurring invoice templates (customer, interval data, totals, items). recurring.get.
• fastbill_list_revenues ~297 tokens
  List revenue entries (income booked in FastBill: customer, totals, dates, payments). Takes the same filters as invoices. revenue.get.
• fastbill_list_templates ~185 tokens
  List the invoice/estimate templates (template id, name, hash). Use a template id with the create tools. Ids change whenever a template is edited. template.get.
• fastbill_list_time_entries ~311 tokens
  List work time entries (customer, project, date, minutes, billable minutes, comment, invoice). Without filters FastBill returns the latest entries of the current month. time.get.
• fastbill_set_invoice_paid ~174 tokens
  WRITE: mark a final invoice as paid, with the payment date and method. invoice.setpaid.
• fastbill_update_customer ~646 tokens
  WRITE: update fields of an existing customer; only the fields you pass change. Bank details are not accepted by this tool. customer.update.

Browse

• PDF tools
• Email
• Payments
• Invoicing and accounting

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