FastBill MCP by usefulapi
Read FastBill customers, invoices, estimates, expenses; create customers, invoices, projects.
Connect it
Settings → Connectors → Add custom connector
URL: https://fastbill.usefulapi.io/mcpSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://fastbill.usefulapi.io/mcp{
"mcpServers": {
"fastbill": {
"url": "https://fastbill.usefulapi.io/mcp"
}
}
}claude mcp add --transport http fastbill https://fastbill.usefulapi.io/mcp{
"servers": {
"fastbill": {
"type": "http",
"url": "https://fastbill.usefulapi.io/mcp"
}
}
}22 tools, pulled live
fastbill_list_customersread-onlyList 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_customerread-onlyOne customer by FastBill customer id. customer.get with CUSTOMER_ID.
fastbill_list_contactsread-onlyList contact persons of customers (name, position, e-mail, phone). Filter by customer, search term or contact id. contact.get.
fastbill_list_invoicesread-onlyList 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_invoiceread-onlyOne invoice by FastBill invoice id, with all line items, VAT, payments and the document URL. invoice.get with INVOICE_ID.
fastbill_list_recurring_invoicesread-onlyList recurring invoice templates (customer, interval data, totals, items). recurring.get.
fastbill_list_estimatesread-onlyList estimates (quotes) with state (a created, b sent, c negotiation, d accepted, e rejected, f invoiced), totals and items. estimate.get.
fastbill_list_expensesread-onlyList expense entries (supplier, category, net/VAT/gross, dates, document URL). Filter by invoice number or date ranges. expense.get.
fastbill_list_revenuesread-onlyList revenue entries (income booked in FastBill: customer, totals, dates, payments). Takes the same filters as invoices. revenue.get.
fastbill_list_articlesread-onlyList products and services (article number, type, title, unit price, VAT, unit). article.get.
fastbill_list_projectsread-onlyList projects (name, customer, hourly rate, VAT, start/end date). project.get.
fastbill_list_time_entriesread-onlyList 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_templatesread-onlyList 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_customerWRITE: 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_customercan modifyWRITE: update fields of an existing customer; only the fields you pass change. Bank details are not accepted by this tool. customer.update.
fastbill_create_invoiceWRITE: 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_invoicecan modifyWRITE, 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_set_invoice_paidcan modifyWRITE: mark a final invoice as paid, with the payment date and method. invoice.setpaid.
fastbill_create_estimateWRITE: create an estimate (quote) for a customer from line items. It is not sent. estimate.create.
fastbill_create_articleWRITE: create a product or service (article number, title and unit price are required). article.create.
fastbill_create_projectWRITE: create a project for a customer (name and customer are required). project.create.
fastbill_create_time_entryWRITE: book a work time entry on a project (customer, project and start time are required). time.create.
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