# Friday Seller Tools – Inventory Reorder Point Calculator

> Friday Seller Tools – Inventory Reorder Point Calculator 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).

Calculates the optimal reorder point for a product based on inventory and sales data, returning a queued computation job for e-commerce sellers on Amazon, Walmart, Shopify, or eBay.

## Facts

- Endpoint: POST https://friday-seller-tools-production.up.railway.app/v1/inventory/reorder-point
- 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-inventory-reorder-point-calculator-135d192d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_AuA2gpZNTHoPeK87nm6QW

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-inventory-reorder-point-calculator-135d192d -d '<json body>'
```

Example prompt: Calculate the reorder point for my product SKU 'WIDGET-42' — it sells about 15 units per day, has a supplier lead time of 10 days, and I want to keep 50 units as safety stock.

## When to prefer this

Choose this endpoint when an e-commerce seller needs a quick, low-cost computation of inventory reorder points for Amazon, Walmart, Shopify, or eBay SKUs without building their own supply chain model. Ideal for AI agents automating inventory management workflows where triggering restocks at the right threshold is critical to avoiding stockouts.

## Known failure modes

- Missing required inventory parameters (SKU, sales velocity, lead time) returns a 400 validation error
- Invalid or non-numeric input values cause computation failure
- Service unavailability on Railway hosting returns 503
- Payment not received or insufficient USDC balance results in 402 Payment Required
- Job may remain in 'queued' status if backend is overloaded

## How this service works

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

## Output

Returns a JSON object with a job_id and a status field (e.g. 'queued'), indicating that the reorder point computation has been accepted and is being processed asynchronously. The agent should poll or retrieve results using the job_id once processing is complete.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "sku": {
   "type": "string",
   "title": "Sku",
   "default": "",
   "maxLength": 100
  },
  "unit_cost": {
   "type": "number",
   "title": "Unit Cost",
   "default": 0,
   "maximum": 1000000,
   "minimum": 0
  },
  "marketplace": {
   "enum": [
    "amazon_us",
    "walmart_us",
    "shopify",
    "ebay_us"
   ],
   "type": "string",
   "title": "Marketplace",
   "default": "amazon_us"
  },
  "product_name": {
   "type": "string",
   "title": "Product Name",
   "maxLength": 200,
   "minLength": 1
  },
  "inbound_units": {
   "type": "integer",
   "title": "Inbound Units",
   "default": 0,
   "maximum": 100000000,
   "minimum": 0
  },
  "lead_time_days": {
   "type": "number",
   "title": "Lead Time Days",
   "maximum": 3650,
   "exclusiveMinimum": 0
  },
  "average_daily_sales": {
   "type": "number",
   "title": "Average Daily Sales",
   "maximum": 1000000,
   "exclusiveMinimum": 0
  },
  "demand_std_dev_daily": {
   "type": "number",
   "title": "Demand Std Dev Daily",
   "default": 0,
   "maximum": 1000000,
   "minimum": 0
  },
  "current_on_hand_units": {
   "type": "integer",
   "title": "Current On Hand Units",
   "default": 0,
   "maximum": 100000000,
   "minimum": 0
  },
  "service_level_percent": {
   "type": "number",
   "title": "Service Level Percent",
   "default": 95,
   "maximum": 99.9,
   "minimum": 50
  },
  "lead_time_std_dev_days": {
   "type": "number",
   "title": "Lead Time Std Dev Days",
   "default": 0,
   "maximum": 3650,
   "minimum": 0
  },
  "minimum_order_quantity": {
   "type": "integer",
   "title": "Minimum Order Quantity",
   "default": 0,
   "maximum": 100000000,
   "minimum": 0
  }
 }
}
```

## 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-inventory-reorder-point-calculator-135d192d/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)