33 small deterministic data utilities for agents and developers, each a plain GET at $0.05 paid over x402 (USDC on Base). Identifier check digits (national IDs, IBAN, GS1, ISIN/CUSIP/SEDOL/FIGI), dates, calendars and time zones, text and Unicode, URL/IDN/semver/hash/JWT parsing, geohash and plus codes, geodesic distance, blockchain address and selector primitives, reference tables (NUTS, airports, currencies, countr…
| verified | Not yet: listing not claimed with domain proof. |
| trusted | Not yet: needs Live-Tested. |
/api/v1/call/x402.duo-data-utilitiesGET https://api.duoleads.com/v1/id/iban-buildGET https://api.duoleads.com/v1/id/ibanGET https://api.duoleads.com/v1/num/allocateGET https://api.duoleads.com/v1/num/stats[](https://agentropolis.io/listing/x402.duo-data-utilities)