# Friday Seller Tools – GTIN Batch Validate

> Friday Seller Tools – GTIN Batch Validate is a paid API for AI agents from friday-seller-tools-production.up.railway.app, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-15).

Validates a batch of GTINs (Global Trade Item Numbers) for correctness and marketplace eligibility across Amazon, Walmart, Shopify, and eBay.

## Facts

- Endpoint: POST https://friday-seller-tools-production.up.railway.app/v1/identifiers/gtin-batch-validate
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/friday-seller-tools-gtin-batch-validate-4c2f1065
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EIu3V0_CPq5Q332k9fc1m

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 friday-seller-tools-gtin-batch-validate-4c2f1065 -d '<json body>'
```

Example prompt: Can you batch validate these GTINs for me before I upload my product catalog to Amazon — I have about 50 UPC codes I need to check for errors or invalid check digits?

## When to prefer this

Choose this endpoint when you need to validate multiple GTINs/UPCs/EANs in a single call before bulk-uploading product listings to Amazon, Walmart, Shopify, or eBay. Prefer this over single-item validation when working with product catalogs of any meaningful size, and when you need asynchronous batch processing with a job_id for later result retrieval.

## Known failure modes

- Invalid or malformed GTIN format in the batch payload — returns validation error
- Empty batch payload — returns 400 bad request
- Batch size exceeds allowed limit — returns error with size constraint details
- Network timeout on Railway-hosted service — returns 5xx error
- Payment not processed (x402 protocol failure) — returns 402 payment required

## How this service works

Instant, low-cost Amazon, Walmart, Shopify, and eBay listing, upload-preparation, advertising, and image-brief deliverables.

## Output

Returns a job_id and a 'queued' status immediately, indicating the batch GTIN validation job has been accepted for asynchronous processing. The agent can use the job_id to poll for results containing per-GTIN validity outcomes.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "codes": {
   "type": "array",
   "items": {
    "type": "string",
    "maxLength": 64,
    "minLength": 1
   },
   "title": "Codes",
   "maxItems": 500,
   "minItems": 1
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "job_id": "example",
  "status": "queued"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/friday-seller-tools-gtin-batch-validate-4c2f1065/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from friday-seller-tools-production.up.railway.app](https://www.zero.xyz/host/friday-seller-tools-production.up.railway.app/llms.txt)