FastBill MCP by usefulapi

Install

Pick the AI app you use, then copy the settings.

Passed 4/4 checks · What you ask goes through the maker’s server (fastbill.usefulapi.io)

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

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

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

Which apps can use it

Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.

Connect over the internet in

ClaudeChatGPTGooseLM StudioMsty StudioCherry StudioCursorVS Code + GitHub CopilotVisual StudioWindsurf (Devin Desktop)ZedKiroClineContinueJetBrains AI AssistantClaude CodeCodex CLIGemini CLIOpenCodenodecodeWarpLibreChatOpen WebUIRaycast

All apps, with pros and cons →

What it can do

Tool names and descriptions exactly as the server reported them on Nov 9, 2026. The maker wrote them, not us; we show them as plain text.

• fastbill_list_customers

  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_get_customer

  One customer by FastBill customer id. customer.get with CUSTOMER_ID.

• fastbill_list_contacts

  List contact persons of customers (name, position, e-mail, phone). Filter by customer, search term or contact id. contact.get.

• fastbill_list_invoices

  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_get_invoice

  One invoice by FastBill invoice id, with all line items, VAT, payments and the document URL. invoice.get with INVOICE_ID.

• fastbill_list_recurring_invoices

  List recurring invoice templates (customer, interval data, totals, items). recurring.get.

• fastbill_list_estimates

  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

  List expense entries (supplier, category, net/VAT/gross, dates, document URL). Filter by invoice number or date ranges. expense.get.

• fastbill_list_revenues

  List revenue entries (income booked in FastBill: customer, totals, dates, payments). Takes the same filters as invoices. revenue.get.

• fastbill_list_articles

  List products and services (article number, type, title, unit price, VAT, unit). article.get.

• fastbill_list_projects

  List projects (name, customer, hourly rate, VAT, start/end date). project.get.

• fastbill_list_time_entries

  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_list_templates

  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_create_customer

  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_update_customer

  WRITE: update fields of an existing customer; only the fields you pass change. Bank details are not accepted by this tool. customer.update.

• fastbill_create_invoice

  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_complete_invoice

  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. invoic

• fastbill_set_invoice_paid

  WRITE: mark a final invoice as paid, with the payment date and method. invoice.setpaid.

• fastbill_create_estimate

  WRITE: create an estimate (quote) for a customer from line items. It is not sent. estimate.create.

• fastbill_create_article

  WRITE: create a product or service (article number, title and unit price are required). article.create.

• fastbill_create_project

  WRITE: create a project for a customer (name and customer are required). project.create.

• fastbill_create_time_entry

  WRITE: book a work time entry on a project (customer, project and start time are required). time.create.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 12, 2026

• ✓ Pass

  Maker matches the repo

  The registry name was verified against the domain usefulapi.io (the registry checks domain ownership)

• ✓ Pass

  Still maintained

  Code last changed yesterday

• … Not checked yet

  Has a licence

  We have not read this repo from GitHub yet

• ✓ Pass

  Endpoint responds

  Responded in 34 ms (HTTP 200)

• – Not applicable

  Sign-in with OAuth

  No sign-in needed

• ✓ Pass

  No hidden instructions in tool descriptions

  Read 22 tool descriptions and found no hidden instructions to the AI

User reviews

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Compared with others in Accounting, finance & taxi

• More stars than 0% of the other 3152 servers in this category
• Published to the registry more recently than 96% of the other 3152 servers in this category
• Basic checks equal to or better than 100% of the other 3152 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

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README from the maker

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