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.
POST /mcpPOST /v1/tools/{tool}/calliban-check | Validate an IBAN by ISO 13616 structure and MOD-97-10 checksum (offline, no bank lookup). |
lei-check | Validate a Legal Entity Identifier (ISO 17442 + ISO 7064 MOD-97-10 check digits). |
vat-mod97-check | Structural VAT check (BE mod-97 family). |
company-number-format | Validate UK Companies House number format (not existence). |
rent-deposit-guard | Rental deposit safety: IBAN checksum + property/deposit country alignment + pre-viewing flag. |
rental-listing-risk | Explainable rental-fraud risk score over listing red-flag signals (deterministic rule engine). |
rental-verdict | One combined, signed rental due-diligence verdict: deposit + landlord entity (LEI/company) + listing risk. |
curl -s -X POST https://openfang-rail.akrivis.workers.dev/v1/tools/iban-check/call \
-H "content-type: application/json" -d '{"input":{"iban":"GB82 WEST 1234 5698 7654 32"}}'
Price 0.00059 USDC/call. Non-custodial — payer→seller direct on Base; the rail never holds funds. Global edge (Cloudflare Workers) · self-describing MCP + x402 · no registry required.