# Friday Seller Tools – Cross-Listing Field Map

> Friday Seller Tools – Cross-Listing Field Map 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 2026-09-14).

Generates a cross-platform field mapping that translates product listing attributes across Amazon, Walmart, Shopify, and eBay for upload-ready preparation.

## Facts

- Endpoint: POST https://friday-seller-tools-production.up.railway.app/v1/catalog/cross-listing-field-map
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/friday-seller-tools-cross-listing-field-map-f2a2e9e2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ZGMocyhLtR0TVr6Cgb_40

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-cross-listing-field-map-f2a2e9e2 -d '<json body>'
```

Example prompt: I have a product listed on Amazon and want to cross-list it on Walmart and eBay — can you generate the field mapping so I know exactly which attributes to fill in for each platform's upload format?

## When to prefer this

Choose this endpoint when you need to translate or normalize product listing attributes across two or more of Amazon, Walmart, Shopify, and eBay, especially when preparing bulk uploads or launching a product simultaneously on multiple platforms. It is purpose-built for ecommerce sellers who need instant, low-cost cross-listing field guidance without manually researching each marketplace's schema.

## Known failure modes

- Unsupported marketplace combination returns a 400 error
- Missing required source or target marketplace parameter causes validation failure
- Unrecognized product category may result in incomplete or generic field mapping
- Service unavailability on Railway hosting returns 503
- Job may remain in queued state if backend processing is delayed

## 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 resolved payload contains a structured field mapping object showing how attributes from the source marketplace translate to equivalent fields on each target marketplace, including required field names, character limits, formatting notes, and any platform-specific requirements for upload preparation.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "fields": {
   "type": "array",
   "items": {
    "type": "object",
    "title": "CrossListingSourceField",
    "required": [
     "name",
     "value"
    ],
    "properties": {
     "name": {
      "type": "string",
      "title": "Name",
      "maxLength": 120,
      "minLength": 1
     },
     "value": {
      "type": "string",
      "title": "Value",
      "maxLength": 3000,
      "minLength": 1
     }
    },
    "additionalProperties": false
   },
   "title": "Fields",
   "maxItems": 50,
   "minItems": 1
  },
  "category_context": {
   "anyOf": [
    {
     "type": "string",
     "maxLength": 200,
     "minLength": 2
    },
    {
     "type": "null"
    }
   ],
   "title": "Category Context",
   "default": null
  },
  "source_marketplace": {
   "enum": [
    "amazon_us",
    "walmart_us",
    "ebay_us"
   ],
   "type": "string",
   "title": "Source Marketplace"
  },
  "target_marketplaces": {
   "type": "array",
   "items": {
    "enum": [
     "amazon_us",
     "walmart_us",
     "ebay_us"
    ],
    "type": "string"
   },
   "title": "Target Marketplaces",
   "maxItems": 2,
   "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-cross-listing-field-map-f2a2e9e2/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)