{"slug":"duo-data-utilities-8b6c6cb0","name":"Duo Data Utilities","summary":"Validate and convert GS1 identifiers: GTIN-8, GTIN-12 (UPC-A), GTIN-13 (EAN-13), GTIN-14, GLN and SSCC. Returns the check-digit verdict, the computed correct check digit, the GTIN-14 form with its indicator digit, and conversion between GTIN-8, GTIN-12, GTIN-13 and GTIN-14. No company-prefix split is returned: GS1's prefix-length table is no longer public data. Also computes a missing check digit from a partial code. Structure only, no product database.","status":"live","indexable":true,"listed_since":"2026-10-25T17:51:54.731604Z","sources":[{"source":"x402_bazaar","external_id":"https://api.duoleads.com/v1/id/gs1","owner_address":"0xcd673f7e1dad254347aeab6be0defe8b9c6b3a39","seen_at":"2026-10-26T06:00:21.658261Z","removed_at":null}],"endpoints":[{"url":"https://api.duoleads.com/v1/id/gs1","host":"api.duoleads.com","protocol":"x402","state":"live","last_probe_at":"2026-10-26T04:45:01.994240Z","last_ok_at":"2026-10-26T04:45:01.994240Z","tools_count":null,"tools_changed_at":null,"uptime_24h":1.0,"uptime_30d":1.0}],"also_listed_as":[{"slug":"api-duoleads-com-e21aa0bc","name":"api.duoleads.com"}],"payment_options":[],"usage":{"source":"x402_bazaar","unique_payers_30d":2,"paid_calls_30d":3,"last_paid_at":"2026-10-08T05:36:09.173Z","reported_at":"2026-10-26T06:00:21.658261Z"},"notice":"Not affiliated with addrbook — claim or request removal."}