io.usefulapiPublished by usefulapi.ioOfficial publisherv1.12.4Updated Nov 7, 2026
Read FastBill customers, invoices, estimates, expenses; create customers, invoices, projects.
The publisher's own server: Ably MCP by usefulapi
Hosted FastBill connector that lets an assistant read customers, invoices, estimates, expenses and projects, and create or finalize billing records.
Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.
Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.
Read https://sourceweft.com/mcp/io.usefulapi%2Ffastbill/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.Add this to your client's mcpServers config.
{
"mcpServers": {
"fastbill-by-usefulapi": {
"type": "http",
"url": "https://fastbill.usefulapi.io/mcp"
}
}
}Live endpoint: https://fastbill.usefulapi.io/mcp
https://fastbill.usefulapi.io/mcp.claude mcp add --transport http fastbill https://fastbill.usefulapi.io/mcp, then run /mcp to log in.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, and the login page asks for your FastBill credentials.
Step-by-step setup, where to find your credentials, and FAQ: https://usefulapi.io/fastbill/
On first connect you will paste your FastBill login e-mail and API key. They are validated, stored per-user, and scoped to you. No keys in config files.
read tools are read-only; write tools mutate data (clients should confirm them); meta tools report usage, manage your subscription or send a feature request.
*Pro has a fair use limit of 10,000 tool calls a month on this server. For more, write to [email protected].
Pro covers this server only. Subscribe with fastbill_upgrade (it returns a Stripe Checkout link). Cancel any time with fastbill_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running fastbill_upgrade before then undoes the cancel. Or write to [email protected].
MIT
Source: servers/fastbill/README.md at commit 4046075
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.
citytermlimitoffsetcountry_codecustomer_numberGet customer
One customer by FastBill customer id. customer.get with CUSTOMER_ID.
customer_idrequiredList contacts
List contact persons of customers (name, position, e-mail, phone). Filter by customer, search term or contact id. contact.get.
termlimitoffsetcontact_idcustomer_idcustomer_numberList 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.
typelimitoffsetend_datestart_datecustomer_idend_due_dateend_paid_dateend_lastupdateinvoice_numberstart_due_datestart_paid_date+1 moreGet invoice
One invoice by FastBill invoice id, with all line items, VAT, payments and the document URL. invoice.get with INVOICE_ID.
invoice_idrequiredList recurring invoices
List recurring invoice templates (customer, interval data, totals, items). recurring.get.
limitoffsetinvoice_idList estimates
List estimates (quotes) with state (a created, b sent, c negotiation, d accepted, e rejected, f invoiced), totals and items. estimate.get.
limitoffsetend_datestart_datecustomer_idestimate_idestimate_numberList expenses
List expense entries (supplier, category, net/VAT/gross, dates, document URL). Filter by invoice number or date ranges. expense.get.
limitoffsetend_dateinvoice_idstart_dateend_paid_dateinvoice_numberstart_paid_dateList revenues
List revenue entries (income booked in FastBill: customer, totals, dates, payments). Takes the same filters as invoices. revenue.get.
limitoffsetend_datestart_datecustomer_idend_paid_dateinvoice_numberstart_paid_dateList products
List products and services (article number, type, title, unit price, VAT, unit). article.get.
limitoffsetarticle_idarticle_numberList projects
List projects (name, customer, hourly rate, VAT, start/end date). project.get.
limitoffsetproject_idcustomer_idList 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.
datelimitoffsettime_idend_dateproject_idstart_datecustomer_idList document 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.
limitoffsetCreate 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.
citytagsemailphonemobilevat_idaddresswebsitezipcodepositionaddress_2last_name+10 moreUpdate customer
WRITE: update fields of an existing customer; only the fields you pass change. Bank details are not accepted by this tool. customer.update.
citytagsemailphonemobilevat_idaddresswebsitezipcodepositionaddress_2last_name+11 moreCreate 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.
itemsrequiredis_grossvat_caseintrotextcustomer_idrequiredtemplate_idinvoice_datecurrency_codedelivery_dateinvoice_titlediscount_percentcash_discount_days+5 moreFinalize 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.
invoice_idrequiredMark invoice paid
WRITE: mark a final invoice as paid, with the payment date and method. invoice.setpaid.
paid_dateinvoice_idrequiredpayment_methodCreate estimate
WRITE: create an estimate (quote) for a customer from line items. It is not sent. estimate.create.
itemsrequiredis_grossintrotextcustomer_idrequiredtemplate_idcurrency_codeestimate_datediscount_percentCreate product
WRITE: create a product or service (article number, title and unit price are required). article.create.
tagstypeunittitlerequiredis_grossunit_pricerequireddescriptionvat_percentcurrency_codearticle_numberrequiredCreate project
WRITE: create a project for a customer (name and customer are required). project.create.
end_datehour_pricestart_datecustomer_idrequiredvat_percentproject_namerequiredcurrency_codeCreate time entry
WRITE: book a work time entry on a project (customer, project and start time are required). time.create.
datecommentminutesend_timearticle_idproject_idrequiredstart_timerequiredcustomer_idrequiredbillable_minutes100% of the applicable checks met
How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.
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{ "mcpServers": { "fastbill": { "url": "https://fastbill.usefulapi.io/mcp" } }}