# Friday Seller Tools – Amazon FBA Aged Inventory Break-Even Calculator

> Friday Seller Tools – Amazon FBA Aged Inventory Break-Even 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).

Calculates the break-even price for Amazon FBA aged inventory to help sellers decide whether to discount, liquidate, or continue holding aging stock.

## Facts

- Endpoint: POST https://friday-seller-tools-production.up.railway.app/v1/amazon/fba/aged-inventory-break-even
- 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-amazon-fba-aged-inventory-break-even-calculator-ab1b2813
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jOJ_nZS5Du-LvSJkmp7Ls

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-amazon-fba-aged-inventory-break-even-calculator-ab1b2813 -d '<json body>'
```

Example prompt: I have an ASIN B08XYZ1234 that's been sitting in FBA for 200 days — my cost of goods is $12, FBA fulfillment fee is $3.50, and monthly storage fee is $0.80 per unit. Can you calculate the break-even price so I know whether to discount it, liquidate, or pull it out?

## When to prefer this

Use this endpoint when an Amazon FBA seller needs a quick, data-driven break-even calculation specifically for aged or slow-moving inventory, particularly when approaching Amazon's long-term storage fee thresholds. Prefer this over generic margin calculators when the decision context is liquidation, markdown, or removal of FBA stock rather than new product pricing.

## Known failure modes

- Missing required cost inputs (COGS, FBA fees) result in validation error
- Invalid or unrecognized ASIN format causes rejection
- Insufficient inventory age data prevents accurate long-term storage fee projection
- Service unavailability returns queued status with delayed result
- Extreme edge cases (zero COGS, negative fees) may produce unexpected output

## 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 computed break-even price, estimated holding costs, and recommended action (e.g. discount, liquidate, remove) delivered asynchronously once the computation completes.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "rows": {
   "type": "array",
   "items": {
    "type": "object",
    "title": "FbaAgedInventoryRow",
    "required": [
     "sku",
     "units",
     "age_days",
     "days_to_next_surcharge_tier",
     "unit_cost",
     "current_price",
     "referral_fee_percent",
     "fulfillment_fee_per_unit",
     "monthly_storage_per_unit",
     "current_surcharge_per_unit_month",
     "next_tier_surcharge_per_unit_month",
     "removal_fee_per_unit",
     "recovery_value_per_unit"
    ],
    "properties": {
     "sku": {
      "type": "string",
      "title": "Sku",
      "pattern": "^[A-Za-z0-9][A-Za-z0-9 ._/\\-]{0,63}$"
     },
     "asin": {
      "anyOf": [
       {
        "type": "string",
        "pattern": "^[A-Z0-9]{10}$"
       },
       {
        "type": "null"
       }
      ],
      "title": "Asin",
      "default": null
     },
     "units": {
      "type": "integer",
      "title": "Units",
      "maximum": 1000000,
      "minimum": 1
     },
     "age_days": {
      "type": "integer",
      "title": "Age Days",
      "maximum": 100000,
      "minimum": 0
     },
     "reference": {
      "anyOf": [
       {
        "type": "string",
        "maxLength": 80,
        "minLength": 1
       },
       {
        "type": "null"
       }
      ],
      "title": "Reference",
      "default": null
     },
     "unit_cost": {
      "type": "number",
      "title": "Unit Cost",
      "maximum": 1000000,
      "minimum": 0
     },
     "current_price": {
      "type": "number",
      "title": "Current Price",
      "maximum": 1000000,
      "exclusiveMinimum": 0
     },
     "discount_percent": {
      "type": "number",
      "title": "Discount Percent",
      "default": 20,
      "maximum": 90,
      "minimum": 0
     },
     "referral_fee_percent": {
      "type": "number",
      "title": "Referral Fee Percent",
      "maximum": 90,
      "minimum": 0
     },
     "removal_fee_per_unit": {
      "type": "number",
      "title": "Removal Fee Per Unit",
      "maximum": 100000,
      "minimum": 0
     },
     "resale_value_per_unit": {
      "type": "number",
      "title": "Resale Value Per Unit",
      "default": 0,
      "maximum": 1000000,
      "minimum": 0
     },
     "recovery_value_per_unit": {
      "type": "number",
      "title": "Recovery Value Per Unit",
      "maximum": 1000000,
      "minimum": 0
     },
     "fulfillment_fee_per_unit": {
      "type": "number",
      "title": "Fulfillment Fee Per Unit",
 
… (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-amazon-fba-aged-inventory-break-even-calculator-ab1b2813/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)