# GTIN to ASIN Lookup (OpenWebNinja)

> GTIN to ASIN Lookup (OpenWebNinja) is a paid API for AI agents from x402.openwebninja.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).

Converts a product's GTIN/barcode to Amazon ASIN(s), returning product details like price, title, ratings, and product URL for a given Amazon marketplace country.

## Facts

- Endpoint: GET https://x402.openwebninja.com/realtime-amazon-data/gtin-to-asin
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/gtin-to-asin-lookup-openwebninja-dfb2a27a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kKzxb07Pm7bVYhmQtVCsA

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability gtin-to-asin-lookup-openwebninja-dfb2a27a
```

Example prompt: Find the Amazon ASIN and current price for the product with GTIN 012345678905 on the US marketplace.

## When to prefer this

Use this endpoint when you need to bridge the physical retail world (barcodes, GTINs, UPCs, EANs) with Amazon's catalog — ideal for price comparison tools, inventory management, product data enrichment, or any workflow that starts with a physical product barcode and needs Amazon listing details. Supports 24 Amazon marketplace countries.

## Known failure modes

- No matching ASIN found for the given GTIN — returns empty products array
- Invalid or malformed GTIN returns an error response
- Unsupported country code returns validation error
- Product not listed in the requested marketplace returns no results
- Payment/x402 authentication failure if USDC not provided

## How this service works

40+ public web-data, SERP, e-commerce, real-estate, finance and AI-search APIs, payable per call over x402 (USDC on Base, Polygon, Arbitrum). No account or API key required. Most endpoints $0.003; AI-model endpoints $0.005.

## Output

Returns an array of matched Amazon products, each including the ASIN, canonical Amazon product URL, product title, price, main image URL, sales rank and rank category, total number of customer ratings, and average star rating. Also includes a response status and unique request ID.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "required": {
   "type": "string"
  },
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {}
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/gtin-to-asin-lookup-openwebninja-dfb2a27a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.openwebninja.com](https://www.zero.xyz/host/x402.openwebninja.com/llms.txt)