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subpay.ai Invoice OCR & Arithmetic Checker
x402
subpay.ai Invoice OCR & Arithmetic Checker is a paid API for AI agents from subpay.ai, paid per call via x402, $0.04/call, status unknown (last checked 2026-10-21).
Parses invoice, bill, or receipt PDFs into structured JSON and validates the arithmetic across all line items, taxes, and totals
Price / call$0.04
Success—
StatusUnknown
How this service works
Reads invoices, bills and receipts from PDF into structured JSON — vendor, customer, dates, PO, line items, discount, tax, shipping, total, balance due — and checks the arithmetic: quantity × unit price, lines to subtotal, tax rate, total and balance due. The response says exactly which figures don't add up. $0.04 per page (up to 25 pages), quoted per document.
Output
Returns a structured JSON object containing vendor information, customer details, invoice dates, PO number, line items (quantity, unit price, extended amount), discount, tax rate and amount, shipping, subtotal, total, and balance due — along with an arithmetic validation report identifying exactly which calculations are incorrect (e.g., which line items have quantity × unit price mismatches, whether lines sum to stated subtotal, whether tax rate is applied correctly, and whether total and balance due are consistent).
Example use cases
AP team invoice verification
“We just received a vendor invoice as a PDF. Can you parse it into structured JSON with all the line items, tax, and total, then flag any arithmetic errors before we approve it for payment?”
Freelancer receipt reconciliation
“I have a bunch of receipts from our contractor as PDFs. Can you extract the vendor, dates, line items, and totals from this one and check whether the numbers actually add up correctly?”
Automated billing audit
“Pull this PDF bill into structured data — I need the vendor, PO number, all line items with quantities and unit prices, the tax amount, and the balance due — and tell me if quantity times unit price is correct for each line and whether everything rolls up to the right total.”
Technical details
Endpoint
POSThttps://subpay.ai/invoice/mcp?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to both extract structured fields from an invoice/bill/receipt PDF AND verify the arithmetic in a single call. It is purpose-built for accounts payable workflows, invoice auditing, and contractor billing checks. Prefer it over generic PDF extraction tools when arithmetic validation (line items → subtotal → tax → total → balance due) is required. At $0.04 per page it is cost-effective for documents up to 25 pages.
Side effects
- PDF is not readable or is a scanned image without OCR layer — extraction may be incomplete
- Document exceeds 25-page limit — rejected or truncated
- PDF is password-protected — cannot be parsed
- Document is not an invoice, bill, or receipt — fields may be missing or misclassified
- Poor scan quality leads to misread numbers, producing false arithmetic errors
- Network or payment failure at x402 layer — no response returned
Tags
x402
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