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2s.io GTIN Barcode Validator
x402
2s.io GTIN Barcode Validator is a paid API for AI agents from 2s.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Validates product barcodes (GTIN-8/12/13/14, UPC-A, EAN-13, ISBN-10/13) using GS1 mod-10/mod-11 check digit logic and returns the canonical 14-digit GTIN-14 form.
Price / call$0.001
Success—
StatusUnknown
How this service works
Validate a product barcode — GTIN-8/12/13/14, UPC-A, EAN-13, or ISBN-10/13 — with the GS1 mod-10 check digit (ISBN-10 uses mod-11). Returns {valid, type, gtin14 (canonical 14-digit form, left-padded), checkDigit, reason}. Normalizes every product identifier to one GTIN-14 key so a product-master/ETL pipeline can dedupe and validate SKUs in one deterministic call instead of doing checksum math in an LLM.
Output
Returns a JSON object with: valid (boolean), type (e.g. 'UPC-A', 'EAN-13', 'ISBN-13'), gtin14 (the canonical 14-digit zero-padded form), checkDigit (the expected check digit), and reason (explanation of why the barcode is valid or invalid).
Example use cases
Example prompt
“Is the barcode 036000291452 a valid UPC-A, and what's its canonical GTIN-14 form?”
Technical details
Endpoint
GEThttps://2s.io/api/validate/gtinWhen to prefer
Use this endpoint when you need to validate and normalize any GS1 product identifier (UPC, EAN, GTIN, ISBN) to its canonical GTIN-14 form in a deterministic, single call — ideal for ETL pipelines, product master data deduplication, or any workflow where you'd otherwise need to implement GS1 mod-10/mod-11 checksum math yourself. Prefer this over LLM-based validation since it is deterministic and authoritative.
Side effects
- Non-numeric or malformed input returns valid=false with a descriptive reason
- Barcode of unrecognized length not matching any GTIN/ISBN format returns valid=false
- Correct format but wrong check digit returns valid=false with the expected check digit
- Missing required gtin query parameter causes a 400 or error response
- Empty string input returns an error or valid=false
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"gtin": "036000291452"
}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
{
"data": {
"ok": true,
"items": [
{
"type": "GTIN-12",
"input": "036000291452",
"valid": true,
"gtin14": "00036000291452",
"reason": null,
"checkDigit": "2"
}
],
"total": 1,
"source": {
"url": "https://2s.io",
"license": "No upstream license — computed by 2s.io",
"provider": "2s.io GTIN validator"
}
},
"meta": {
"cost": {
"usd": 0.001,
"tier": 0
},
"caller": "x402",
"version": null,
"endpoint": "validate.gtin",
"settlement": {
"txHash": "0xbb549fe7bccd1a0a603312553d10047bd5c1f028b36b1b2ce7efe4c74f7eda4f",
"network": "eip155:8453",
"success": true
}
}
}Tags
x402
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