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Duo Data Utilities – GS1 Identifier Validation & Conversion
x402
Duo Data Utilities – GS1 Identifier Validation & Conversion is a paid API for AI agents from api.duoleads.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-02).
Validates GS1 identifiers (GTIN-8/12/13/14, GLN, SSCC), verifies check digits, computes missing check digits, and converts between GTIN formats
Price / call$0.05
Success—
StatusUnknown
How this service works
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.
Output
Returns a JSON object with: whether the code is valid, the identifier type (e.g. gtin13, gln), the normalised code, the check digit and whether it is correct, the equivalent GTIN-14, any alternative valid interpretations (e.g. also_valid_as GLN), the reason for invalidity if applicable, and metadata including request ID, timestamp, price, and a determinism flag.
Example use cases
Barcode check digit verification at ingest
“I'm processing a product feed and need to check whether this GTIN-13 barcode 4006381333931 has a valid check digit before importing it into our catalog.”
Compute missing check digit for label printing
“I have the partial GTIN-13 code 590123412345 without the last digit — can you calculate what the correct check digit should be?”
Convert UPC-A to GTIN-14 for EDI
“Our EDI system needs GTIN-14 codes but our supplier sent us UPC-A barcodes like 012345678905 — can you convert that to GTIN-14?”
Technical details
Endpoint
GEThttps://api.duoleads.com/v1/id/gs1?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need purely structural/mathematical GS1 validation or format conversion without consulting a product database. It is ideal for data-pipeline validation, EDI preprocessing, label-printing workflows, or any scenario where you need to verify or compute check digits programmatically at low cost ($0.05/call). It does not look up product information — for that, use a product database API instead.
Side effects
- Missing 'value' query parameter returns an error
- Non-numeric or malformed input (letters, wrong length) returns an invalid result or error
- op=convert without a 'to' parameter returns an error
- op=convert targeting a shorter format than the input (e.g. GTIN-8 from a GTIN-14) may be unsupported
- Network or payment errors (402 payment required if x402 payment is not completed)
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"data": {
"type": "gtin13",
"valid": true,
"gtin14": "05901234123457",
"reason": null,
"indicator": "0",
"normalised": "5901234123457",
"check_digit": "7",
"also_valid_as": [
"gln"
],
"check_digit_ok": true
},
"meta": {
"price_usd": "0.05",
"disclaimer": "Factual output of a deterministic computation over public data. Provided as is, with no warranty of accuracy, completeness or availability. Not investment, financial, legal, tax, medical or any other professional advice, and not a recommendation. Verify before relying on it. Terms: https://api.duoleads.com/terms",
"request_id": "01K6B7Q4ZC8H3F2M9WXR5TYN0D",
"computed_at": "2026-09-28T12:00:00.000Z",
"deterministic": true
},
"route": "/v1/id/gs1",
"version": "1.0.0"
}
}Tags
x402
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