# Friday Seller Tools – Alt Text Pack Generator

> Friday Seller Tools – Alt Text Pack Generator 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).

Generates a pack of SEO-optimized alt text descriptions for marketplace product images across Amazon, Walmart, Shopify, and eBay.

## Facts

- Endpoint: POST https://friday-seller-tools-production.up.railway.app/v1/marketplace-images/alt-text-pack
- 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-alt-text-pack-generator-9d4c539a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WOph5L9g96k69f-YDaT8K

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-alt-text-pack-generator-9d4c539a -d '<json body>'
```

Example prompt: Generate an alt text pack for my Amazon product listing — it's a stainless steel water bottle called 'HydroFlow Pro' in the Kitchen & Dining category, and I need SEO-optimized alt text for all the product images.

## When to prefer this

Choose this endpoint when you need ready-to-upload, SEO-optimized alt text for marketplace product images in bulk — especially when targeting Amazon, Walmart, Shopify, or eBay simultaneously. It is purpose-built for seller workflows at $0.25 per call, making it cost-effective compared to general-purpose LLM prompting for alt text generation at scale.

## Known failure modes

- Missing required product or image data returns a 400 validation error
- Payment not processed (x402 protocol failure) results in 402 Payment Required
- Server overload or cold-start on Railway may cause delayed queuing
- Invalid marketplace target returns an error or fallback generic copy
- Job not found when polling with job_id if it expired or never queued

## 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 queued status immediately; the completed alt text pack contains SEO-optimized, marketplace-ready alt text strings for each product image, formatted for use across Amazon, Walmart, Shopify, or eBay listing upload workflows.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "images": {
   "type": "array",
   "items": {
    "type": "object",
    "title": "GalleryImageInput",
    "required": [
     "position",
     "visual_description"
    ],
    "properties": {
     "position": {
      "type": "integer",
      "title": "Position",
      "maximum": 12,
      "minimum": 1
     },
     "is_main_image": {
      "type": "boolean",
      "title": "Is Main Image",
      "default": false
     },
     "focus_keywords": {
      "type": "array",
      "items": {
       "type": "string",
       "maxLength": 100,
       "minLength": 1
      },
      "title": "Focus Keywords",
      "maxItems": 5
     },
     "visual_description": {
      "type": "string",
      "title": "Visual Description",
      "maxLength": 1000,
      "minLength": 5
     }
    },
    "additionalProperties": false
   },
   "title": "Images",
   "maxItems": 12,
   "minItems": 1
  },
  "product": {
   "type": "object",
   "title": "ProductFacts",
   "required": [
    "brand",
    "product_name",
    "category",
    "features"
   ],
   "properties": {
    "brand": {
     "type": "string",
     "title": "Brand",
     "maxLength": 100,
     "minLength": 1
    },
    "benefits": {
     "type": "array",
     "items": {
      "type": "string",
      "maxLength": 500,
      "minLength": 1
     },
     "title": "Benefits",
     "maxItems": 20
    },
    "category": {
     "type": "string",
     "title": "Category",
     "maxLength": 150,
     "minLength": 2
    },
    "features": {
     "type": "array",
     "items": {
      "type": "string",
      "maxLength": 500,
      "minLength": 1
     },
     "title": "Features",
     "maxItems": 20,
     "minItems": 1
    },
    "keywords": {
     "type": "array",
     "items": {
      "type": "string",
      "maxLength": 100,
      "minLength": 1
     },
     "title": "Keywords",
     "maxItems": 50
    },
    "materials": {
     "type": "array",
     "items": {
      "type": "string",
      "maxLength": 100,
      "minLength": 1
     },
     "title": "Materials",
     "maxItems": 20
    },
    "price_usd": {
     "anyOf": [
      {
       "type": "number",
       "maximum": 1000000,
       "exclusiveMinimum": 0
      },
      {
       "type": "null"
      }
     ],
     "title": "Price Usd",
     "default": null
    },
    "dimensions": {
     "anyOf": [
      {
       "type": "string",
       "maxLength": 200
      },
      {
       "type": "null"
      }
     ],
     "title": "Dimensions",
     
… (truncated)
```

## 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-alt-text-pack-generator-9d4c539a/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)