ISHOB

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "docs": "/api",
  "asset": "USDC",
  "error": "payment_required",
  "legal": "Tool output: see `rights_notice` / `attribution` in the paid response for the terms of the underlying data.",
  "network": "eip155:8453",
  "protocol": "x402",
  "resource": "/v1/product-code",
  "price_usd": "0.001",
  "how_to_pay": "Read the base64 PAYMENT-REQUIRED response header, sign an x402 'exact' payment for one of its `accepts` entries, and retry this request with the PAYMENT-SIGNATURE header. Compatible clients: @x402/fetch, @x402/axios, x402 Python/Go SDKs.",
  "description": "Look up a product barcode number: identify and validate EAN-13, EAN-8, UPC-A, UPC-E, GTIN-14, ISBN-13/10, ISSN and ISMN codes (wrong check digits are reported with the correct digit), convert between forms (GTIN-14, EAN-13, UPC-A, ISBN-10 <-> 13) and decode the GS1 prefix. Then fetch product data from open databases: name, brand, quantity, categories, image, labels, Nutri-Score (food, cosmetics, pet food via Open Food Facts) or title, authors, publisher and cover (books via Open Library).",
  "network_name": "Base",
  "x402_version": 2
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x906F87F107B4675dD890b3f8EB2d51885E50e09d",
    "amount": "1000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 120
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "code": "3017620422003"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "type": "EAN-13",
          "input": "3017620422003",
          "valid": true,
          "source": {
            "name": "Open Food Facts"
          },
          "product": {
            "name": "Nutella",
            "brand": "Nutella, Ferrero",
            "quantity": "400 g",
            "nutriscore": "e"
          },
          "gs1_prefix": {
            "prefix": "301",
            "issued_by": "GS1 France"
          },
          "conversions": {
            "ean13": "3017620422003",
            "gtin14": "03017620422003"
          }
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method"
          ],
          "properties": {
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "queryParams": {
              "type": "object",
              "required": [
                "code"
              ],
              "properties": {
                "code": {
                  "type": "string",
                  "maxLength": 20,
                  "description": "Barcode number: 8/12/13/14 digits or ISBN-10 (spaces and hyphens ignored), e.g. 3017620422003"
                },
                "lookup": {
                  "type": "boolean",
                  "default": true,
                  "description": "Also fetch product / book data from open databases (false = validate and convert only)"
                }
              }
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object"
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog

2026-10-25 20:36Z

Last indexed by Roundhouse

2026-10-26 17:20Z

Last enriched (probe, favicon, geo)

2026-10-14 03:45Z

x402 version

2

Max timeout

120s

Liveness probe

HTTP 402