openfang-rail
Deterministic business-identifier validation (IBAN, LEI, VAT, UK company no.) and rental due-diligence (deposit-safety, listing-risk, one signed verdict), paid per call via x402 (gasless EIP-3009 USDC on Base). Non-custodial, signed receipts, offline + explainable — no ML, no scraping. First 20 calls/day free.