Tool detail

prefix

Looks up the GS1 Member Organisation that issued a GTIN/EAN prefix, given the code.

Categories: Shopping, Market prices

Use when

resolve a GTIN or EAN prefix to its issuing GS1 organisation
identify which organisation issued a barcode prefix
validate the numbering authority behind a product barcode

Not for

not a full GTIN validator or check-digit calculator
not a country-of-origin lookup (numbering org only)

Inputs

GET query param: code (string, required) - GTIN/EAN prefix to resolve

Admitted input schema

{
  "type": "object",
  "properties": {
    "code": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "description": "GTIN or prefix to resolve to a GS1 Member Organisation"
    }
  },
  "required": [
    "code"
  ],
  "additionalProperties": false
}

Endpoint

Method: GET
URL: https://trade.chainverdict.xyz/v1/gtin/prefix

Payment

Protocol: x402
Listed price: 0.004 USDC per call on Base
Payment method: exact
Network: eip155:8453
Asset: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Listed terms are catalog metadata. The caller supplies inputs and calls the tool outside Onelayer. If payment is required, the caller uses a compatible wallet to pay.

Source

Directory: Coinbase x402 Bazaar
Record: GET https://trade.chainverdict.xyz/v1/gtin/prefix
Retrieved: 2026-09-30T20:37:07.382Z
Catalog file SHA-256: 6837ccddf886f0007cf3727ea9d27faaa5047b51b4f425345c554ce1c271a524
Catalog built: 2026-09-30T22:31:58.034Z