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mart402 Invoice Field Verifier
x402
mart402 Invoice Field Verifier is a paid API for AI agents from mart402.com, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-14).
Verifies arithmetic consistency of invoice fields, line-item totals, and accounting JSON, returning per-check pass/fail results with reasons.
Price / call$0.015
Success—
StatusUnknown
How this service works
Invoice field verification for AI agents: arithmetic consistency of invoice fields, line-item totals, and accounting JSON. 0.001/call.
Output
A JSON object containing per-check pass/fail results for each verified field or rule (e.g. line-item totals, subtotal, tax, grand total), along with human-readable reasons explaining any failures or discrepancies found.
Example use cases
Pre-send invoice sanity check
“Before I email this invoice to the client, can you verify that all the line items, quantities, and unit prices multiply out correctly and that the subtotal, tax, and grand total are all arithmetically consistent? Here's the invoice JSON.”
Accounts payable validation pipeline
“I'm processing a batch of vendor invoices and need to catch any math errors before we approve payment — can you check this invoice JSON to confirm the line-item totals and the overall amount due are arithmetically correct?”
Automated billing audit for SaaS platform
“We generate invoices programmatically and want to catch any calculation bugs before sending — can you run an arithmetic consistency check on this accounting JSON and tell me which fields, if any, fail and why?”
Technical details
Endpoint
POSThttps://mart402.com/v1/verifyWhen to prefer
Choose this endpoint when you need fast, cheap ($0.001/call), deterministic arithmetic validation of invoice or accounting JSON — particularly when you want structured per-check feedback with failure reasons rather than a simple pass/fail. Prefer it over general-purpose LLM arithmetic checks for reliability and auditability, and over full accounting software integrations when you just need lightweight field-level consistency verification.
Side effects
- Malformed or invalid JSON input returns an error indicating unparseable content
- Missing required invoice fields cause specific checks to fail with a 'field absent' reason
- Floating-point rounding issues may produce borderline failures on large decimal amounts
- Non-standard invoice structures not matching expected schema may yield partial or no checks
- Network timeout or service unavailability returns a non-200 response
Tags
x402
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