# Friday Seller Tools – Multi-Channel Margin Parity Calculator

> Friday Seller Tools – Multi-Channel Margin Parity Calculator is a paid API for AI agents from friday-seller-tools-production.up.railway.app, paid per call via x402, $0.5/call, status unknown (last checked 2026-09-15).

Computes and reconciles product pricing across Amazon, Walmart, Shopify, and eBay to ensure consistent profit margins and competitive parity.

## Facts

- Endpoint: POST https://friday-seller-tools-production.up.railway.app/v1/pricing/multi-channel-margin-parity
- Price: $0.5/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-multi-channel-margin-parity-calculator-5ed12cf5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_omTwnksy83lDx22kgNt7l

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-multi-channel-margin-parity-calculator-5ed12cf5 -d '<json body>'
```

Example prompt: Can you check the margin parity for my product that costs $12 to make — I'm selling it at $29.99 on Amazon, $28.50 on Walmart, $31 on Shopify, and $27.99 on eBay, and I want to know which channel is most profitable after fees?

## When to prefer this

Choose this endpoint when a seller needs to simultaneously compare net margins across multiple e-commerce marketplaces (Amazon, Walmart, Shopify, eBay) accounting for their distinct fee structures. It is especially valuable when repricing after a fee change, launching on a new channel, or auditing existing listings for profitability inconsistencies. Prefer it over manual spreadsheet approaches or single-platform margin tools when cross-channel parity is the primary concern.

## Known failure modes

- Missing required pricing or cost inputs returns a validation error
- Invalid or unsupported marketplace channel names may cause processing failures
- Incomplete fee-structure data may result in inaccurate margin calculations
- Async job may time out if the backend queue is overloaded — poll job_id for status
- Network or payment failure at the x402 layer prevents job submission

## 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, with the eventual result containing per-channel margin percentages, net profit figures after marketplace fees, and pricing recommendations to achieve parity across Amazon, Walmart, Shopify, and eBay.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "sku": {
   "type": "string",
   "title": "Sku",
   "maxLength": 120,
   "minLength": 1
  },
  "channels": {
   "type": "array",
   "items": {
    "type": "object",
    "title": "ChannelMarginInput",
    "required": [
     "channel",
     "price",
     "units_sold"
    ],
    "properties": {
     "price": {
      "type": "number",
      "title": "Price",
      "maximum": 1000000,
      "exclusiveMinimum": 0
     },
     "channel": {
      "enum": [
       "amazon_us",
       "walmart_us",
       "shopify",
       "ebay_us"
      ],
      "type": "string",
      "title": "Marketplace"
     },
     "units_sold": {
      "type": "integer",
      "title": "Units Sold",
      "maximum": 10000000,
      "minimum": 1
     },
     "period_fixed_cost": {
      "type": "number",
      "title": "Period Fixed Cost",
      "default": 0,
      "maximum": 10000000,
      "minimum": 0
     },
     "fixed_fee_per_unit": {
      "type": "number",
      "title": "Fixed Fee Per Unit",
      "default": 0,
      "maximum": 100000,
      "minimum": 0
     },
     "percentage_fee_percent": {
      "type": "number",
      "title": "Percentage Fee Percent",
      "default": 0,
      "maximum": 60,
      "minimum": 0
     },
     "shipping_cost_per_unit": {
      "type": "number",
      "title": "Shipping Cost Per Unit",
      "default": 0,
      "maximum": 100000,
      "minimum": 0
     },
     "fulfillment_cost_per_unit": {
      "type": "number",
      "title": "Fulfillment Cost Per Unit",
      "default": 0,
      "maximum": 100000,
      "minimum": 0
     },
     "other_variable_cost_per_unit": {
      "type": "number",
      "title": "Other Variable Cost Per Unit",
      "default": 0,
      "maximum": 100000,
      "minimum": 0
     }
    },
    "description": "Seller-supplied observed price, volume, and cost stack for one channel.",
    "additionalProperties": false
   },
   "title": "Channels",
   "maxItems": 4,
   "minItems": 2
  },
  "product_name": {
   "type": "string",
   "title": "Product Name",
   "maxLength": 200,
   "minLength": 1
  },
  "baseline_channel": {
   "enum": [
    "amazon_us",
    "walmart_us",
    "shopify",
    "ebay_us"
   ],
   "type": "string",
   "title": "Marketplace"
  },
  "seller_price_floor": {
   "anyOf": [
    {
     "type": "number",
     "maximum": 1000000,
     "exclusiveMinimum": 0
    },
    {
     "type": "null"
    }
   ],
   "title": "Seller Price Floor",
   "default": null
  },
  "product_cos
… (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-multi-channel-margin-parity-calculator-5ed12cf5/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)