FastBill MCP by usefulapi MCP Server

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answering

FastBill MCP by usefulapi is answering right now. Last checked 1 min ago. It exposes 22 tools. Last commit 1 Nov 2026.

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

Uptime history 7 days of history · worst day 99%

7 days agonow

100.0%

Uptime 24h

92 of 92 checks

Tools

read from the server

172 ms

Response time

average over 24h

Stars

last commit 1 Nov 2026

What changed 10

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 27 October 2026. No other catalogue keeps this.

31 Oct a tool changed version4 times that day

30 Oct a tool changed version2 times that day

29 Oct a tool changed version2 times that day

28 Oct a tool changed version

27 Oct a tool changed version

and 5 more, back to 27 October 2026

FastBill MCP by usefulapi missed one check this week

Everything else answered, so this is steady rather than shaky. We check every 15 minutes, which is how a one-off gets told apart from the start of a pattern, and how you hear about the next one within the hour instead of from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 1 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

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

Settings → Connectors → Add custom connector, then paste this address

https://fastbill.usefulapi.io/mcp

~/.codex/config.toml

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

.cursor/mcp.json

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

.vscode/mcp.json

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

Available tools 22

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

fastbill

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. invoice.complete.

fastbill_create_article

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

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_create_estimate

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

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_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.

fastbill_get_customer

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

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_articles

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

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_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_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_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_list_projects

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

fastbill_list_recurring_invoices

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

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

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.

Endpoints

URL	Transport	State	Latency	Checked
https://fastbill.usefulapi.io/mcp	streamable-http	answering	157 ms	1 min ago

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FastBill MCP by usefulapi — questions

Answers built from our own checks of this server.

What can FastBill MCP by usefulapi do?

It exposes 22 tools, read directly from the server on our last check. Among them: fastbill_complete_invoice, fastbill_create_article, fastbill_create_customer, fastbill_create_estimate, fastbill_create_invoice, fastbill_create_project and 16 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is FastBill MCP by usefulapi working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 172 ms. The bar chart above shows every period we have measured.

How do I connect FastBill MCP by usefulapi?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does FastBill MCP by usefulapi need an API key?

No. FastBill MCP by usefulapi completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 22 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is FastBill MCP by usefulapi?

It answers our handshake in 172 ms on average, which is faster than 78% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is FastBill MCP by usefulapi open source?

The code is open source: it is published under the MIT licence, written in JavaScript, 1 stars on GitHub and 1 open issue. The licence covers the code in the repository, not the hosted service at fastbill.usefulapi.io, which runs on its operator's own terms.