StackBill Invoice PDF Generator

x402

StackBill Invoice PDF Generator is a paid API for AI agents from stackbill.app, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-13).

Generates a professional invoice PDF from JSON recipient and line-item data, with server-side tax and total computation, in standard, legal, or creative layouts.

Price / call$0.1

Seller volume →—

Success—

StatusUnknown

How this service works

Generate a finished, professional invoice PDF from JSON — recipient and line items in, a ready-to-send application/pdf out. Layouts: standard, legal, creative. Totals and tax are computed server-side so the numbers always add up. First payment auto-creates a wallet profile (token + API key in response headers); returning wallets get sequential invoice numbering and can save a sender letterhead. USD only.

Output

Returns a binary application/pdf file containing the finished invoice, with server-computed line totals, subtotal, tax amount, and grand total. On the first paid call, response headers include an X-StackApps-Token and API key to activate a wallet profile for sequential invoice numbering and saved sender letterhead on future calls.

Example use cases

Freelance consultant billing a client

“Create an invoice PDF for my client TechStart Inc at 789 Silicon Blvd — I did 15 hours of UX design at $120/hour and 3 hours of revisions at $90/hour. Apply 7% tax, due date is 2025-08-15, and I'm billing as Nova Design Studio at 22 Elm Street. Use the standard layout.”

Law firm generating a legal billing statement

“Generate a legal-template billing statement PDF for Smith & Partners LLC at 100 Court St. Line items: 'Work session on 2025-07-10: Initial consultation' for 2 hours at $300/hour and 'Work session on 2025-07-14: Contract review' for 4 hours at $300/hour. No tax, due 2025-07-31. Sender is Carter Legal Group at 55 Law Plaza.”

Agency creating a creative-layout service invoice

“Make a creative-layout invoice for my client Bloom Bakery at 9 Sweet Lane — services are 'Brand Strategy: Full identity package' for 1 unit at $1,500 and 'Social Media: Monthly content plan' for 1 unit at $800. Add a note that says 'Thank you for your business!' and apply 6% tax. I'm sending this as Pixel & Co, 77 Studio Row.”

Technical details

Endpoint

POSThttps://stackbill.app/routes/x402/invoice-from-data

When to prefer

Choose this endpoint when you need a server-rendered, print-ready PDF invoice with automatic tax and total computation — not just a data record. Ideal for agents that must deliver a ready-to-send document to a client, especially when you want sequential invoice numbering across calls (via wallet profile) or a choice of professional layouts (standard, legal with date columns, or creative service-fee layout). Prefer over client-side PDF libraries when accuracy of arithmetic and consistent formatting are required without local rendering dependencies.

Side effects

Missing required fields (recipient or lineItems) returns a 400 validation error
Currency set to anything other than USD returns an error (v1 is USD-only)
Invalid date format for dueDate or line item work-session dates causes rendering issues
Payment failure via x402 protocol prevents PDF generation
Providing an invalid X-StackApps-Token may prevent sequential numbering or letterhead retrieval
Empty lineItems array or zero-quantity items rejected by schema validation

Input

Schema · Request body

Field	Type	Description
notes	string	Optional notes printed at the bottom of the invoice
sender	object	Who the invoice is from. Optional for activated wallet profiles (send X-StackApps-Token) — the profile's saved name and address are used
dueDate	string	Optional due date, YYYY-MM-DD
taxRate	number	Optional tax percent applied to the subtotal (e.g. 7.5)
currency	string	Optional; must be "USD" if present (v1 renders USD only)
template	string	Optional PDF layout (default standard): legal = billing statement with a per-line Date column (populated when descriptions start with 'Work session on YYYY-MM-DD: '); creative = service/fee layout without hours-rate columns (service name taken from the text before ': ' in each description)
lineItems	array	At least one line item; amount per line, subtotal, tax and total are computed server-side
recipient	object	Who the invoice is billed to
invoiceNumber	string	Invoice number printed on the PDF. Optional when the request carries an X-StackApps-Token header from a previous paid call — the next sequential number for that wallet is used and returned in the X-Invoice-Number response header

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