# Friday Seller Tools – Amazon FBA Storage Overage Break-Even Calculator

> Friday Seller Tools – Amazon FBA Storage Overage 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 2026-09-14).

Calculates the break-even point for Amazon FBA storage overage fees, helping sellers determine when storage costs exceed profitability thresholds.

## Facts

- Endpoint: POST https://friday-seller-tools-production.up.railway.app/v1/amazon/fba/storage-overage-break-even
- Price: $0.5/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-amazon-fba-storage-overage-break-even-calculator-4a3e9125
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dnCxyOvDmDzS2ZrLm9p2J

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-storage-overage-break-even-calculator-4a3e9125 -d '<json body>'
```

Example prompt: I have 500 units of an ASIN taking up 20 cubic feet in Amazon FBA, with a monthly storage rate of $2.40/cubic foot and a selling price of $25 with a COGS of $8 — can you calculate the storage overage break-even point so I know how many units I need to move before the fees eat my profit?

## When to prefer this

Choose this endpoint when an Amazon FBA seller needs a fast, low-cost ($0.50) computation of their storage overage break-even point — particularly useful during Q4 planning, long-term storage fee avoidance decisions, or new product FBA feasibility analysis. Prefer this over manual spreadsheet calculations or general-purpose FBA tools when you need a programmatic, agent-callable result integrated into a larger seller workflow.

## Known failure modes

- Missing required fields (ASIN, volume, pricing) returns a 400 validation error
- Invalid or negative numeric inputs may cause computation errors
- Service may return queued status requiring polling for result retrieval
- Railway.app hosting may experience cold-start latency or downtime

## 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 indicating the computation has been submitted; upon completion delivers the break-even unit count, break-even revenue figure, total storage overage cost, and profitability threshold data for the given FBA product parameters.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "rows": {
   "type": "array",
   "items": {
    "type": "object",
    "title": "FbaStorageOverageRow",
    "required": [
     "reference",
     "report_date",
     "storage_type",
     "unit_count",
     "storage_usage_cubic_feet",
     "storage_limit_cubic_feet",
     "reported_overage_cubic_feet",
     "overage_charge_rate",
     "reported_overage_fee"
    ],
    "properties": {
     "reference": {
      "type": "string",
      "title": "Reference",
      "pattern": "^[A-Za-z0-9._:/ -]+$",
      "maxLength": 80,
      "minLength": 1
     },
     "unit_count": {
      "type": "integer",
      "title": "Unit Count",
      "maximum": 100000000,
      "minimum": 0
     },
     "report_date": {
      "type": "string",
      "title": "Report Date",
      "format": "date"
     },
     "storage_type": {
      "type": "string",
      "title": "Storage Type",
      "pattern": "^[A-Za-z0-9 _/-]+$",
      "maxLength": 80,
      "minLength": 2
     },
     "overage_charge_rate": {
      "type": "number",
      "title": "Overage Charge Rate",
      "maximum": 1000000,
      "minimum": 0
     },
     "reported_overage_fee": {
      "type": "number",
      "title": "Reported Overage Fee",
      "maximum": 1000000000,
      "minimum": 0
     },
     "storage_limit_cubic_feet": {
      "type": "number",
      "title": "Storage Limit Cubic Feet",
      "maximum": 1000000000,
      "minimum": 0
     },
     "storage_usage_cubic_feet": {
      "type": "number",
      "title": "Storage Usage Cubic Feet",
      "maximum": 1000000000,
      "minimum": 0
     },
     "reported_overage_cubic_feet": {
      "type": "number",
      "title": "Reported Overage Cubic Feet",
      "maximum": 1000000000,
      "minimum": 0
     }
    },
    "description": "One seller-supplied Inventory Storage Overage Fees report row.",
    "additionalProperties": false
   },
   "title": "Rows",
   "maxItems": 100,
   "minItems": 1
  },
  "scenarios": {
   "type": "array",
   "items": {
    "type": "object",
    "title": "FbaStorageOverageScenario",
    "required": [
     "row_reference",
     "label",
     "strategy",
     "cubic_feet_reduction"
    ],
    "properties": {
     "label": {
      "type": "string",
      "title": "Label",
      "maxLength": 100,
      "minLength": 2
     },
     "strategy": {
      "enum": [
       "remove",
       "sell_through",
       "capacity_increase"
      ],
      "type": "string",
      "title": "Strategy"
     },
     "one_
… (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-storage-overage-break-even-calculator-4a3e9125/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)