SANDBOX - identical API on Base Sepolia. Test USDC is free (faucet). Production: mart402.com
402MART402 use cases

Invoice processing

Goal: a PDF invoice in, verified accounting JSON out - without trusting an OCR you cannot taste-test.

One call (recommended)

POST /v1/document-pipeline {"url": "https://.../invoice.pdf"}
-> stages: parse (markdown + ocr_quality) -> fields (invoice JSON)
   -> verify (tax math, totals, JP registration check digit)

Flat $0.05 per document (text PDFs to 20 pages, scans to 3). Inputs are validated before any payment settles; every stage outcome is recorded honestly in the response and on the receipt.

Step by step (cheaper, more control)

POST /v1/pdf-info      $0.001  is it scanned? how many pages?
POST /v1/parse/quote   free    exact parse price before paying
POST /v1/parse         $0.005/doc or $0.012/page (scanned)
POST /v1/verify        $0.005  arithmetic + registration checks

Japanese invoices are a design focus: Japanese-strong OCR routing and JP registration number (T+13) check-digit validation.