About this tool

CommaCheck Base offers a free local CSV preview and paid x402 v2 quality API. Preview flags duplicates, blank cells, uneven columns and formula-like prefixes without login, upload or wallet. Separate opt-in checkout first retrieves an unsigned 0.005 native Circle USDC Base quote using invented data only; only after explicit consent and buyer wallet authorization can a permitted nonconfidential CSV be sent for a structured JSON report. Not crypto payout reconciliation, blockchain settlement verification, security audit or accounting advice. No paying human clients are claimed.