# Friday Seller Tools – Amazon FBA Monthly Storage Fee Verifier

> Friday Seller Tools – Amazon FBA Monthly Storage Fee Verifier 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).

Verifies and audits Amazon FBA monthly storage fees for seller inventory to identify overcharges or discrepancies.

## Facts

- Endpoint: POST https://friday-seller-tools-production.up.railway.app/v1/amazon/fba/monthly-storage-fee-verifier
- 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-monthly-storage-fee-verifier-b374569a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_itTEbBa6sGBr9bt8FU8-R

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-monthly-storage-fee-verifier-b374569a -d '<json body>'
```

Example prompt: Can you verify my Amazon FBA monthly storage fees for last month and flag any discrepancies or overcharges across my inventory?

## When to prefer this

Choose this endpoint when you need to audit or verify Amazon FBA monthly storage fees specifically — particularly when reconciling invoices, preparing fee disputes, or checking for overcharges. It is purpose-built for FBA storage cost validation rather than general fee estimation or listing optimization.

## Known failure modes

- Missing or malformed inventory data returns a validation error
- Invalid ASIN/SKU identifiers cause lookup failures
- Job may remain in queued status if processing is delayed
- Insufficient fee data to compare against Amazon's rate card returns incomplete analysis
- Authentication or payment failure returns 402 Payment Required

## 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 a detailed verification of Amazon FBA monthly storage fees including fee breakdowns, identified discrepancies, overcharge flags, and per-SKU or per-ASIN storage cost analysis.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "rows": {
   "type": "array",
   "items": {
    "type": "object",
    "title": "FbaStorageFeeVerifierRow",
    "required": [
     "item_volume",
     "average_quantity_on_hand",
     "storage_rate",
     "reported_monthly_storage_fee"
    ],
    "properties": {
     "asin": {
      "anyOf": [
       {
        "type": "string",
        "pattern": "^[A-Z0-9]{10}$"
       },
       {
        "type": "null"
       }
      ],
      "title": "Asin",
      "default": null
     },
     "fnsku": {
      "anyOf": [
       {
        "type": "string",
        "pattern": "^[A-Za-z0-9]{1,20}$"
       },
       {
        "type": "null"
       }
      ],
      "title": "Fnsku",
      "default": null
     },
     "reference": {
      "anyOf": [
       {
        "type": "string",
        "maxLength": 80,
        "minLength": 1
       },
       {
        "type": "null"
       }
      ],
      "title": "Reference",
      "default": null
     },
     "item_volume": {
      "type": "number",
      "title": "Item Volume",
      "maximum": 100000,
      "minimum": 0
     },
     "storage_rate": {
      "type": "number",
      "title": "Storage Rate",
      "maximum": 100000,
      "minimum": 0
     },
     "month_of_charge": {
      "anyOf": [
       {
        "type": "string",
        "maxLength": 20,
        "minLength": 1
       },
       {
        "type": "null"
       }
      ],
      "title": "Month Of Charge",
      "default": null
     },
     "incentive_fee_amount": {
      "type": "number",
      "title": "Incentive Fee Amount",
      "default": 0,
      "maximum": 1000000000,
      "minimum": -1000000000
     },
     "average_quantity_on_hand": {
      "type": "number",
      "title": "Average Quantity On Hand",
      "maximum": 10000000,
      "minimum": 0
     },
     "reported_base_storage_fee": {
      "anyOf": [
       {
        "type": "number",
        "maximum": 1000000000,
        "minimum": 0
       },
       {
        "type": "null"
       }
      ],
      "title": "Reported Base Storage Fee",
      "default": null
     },
     "reported_total_item_volume": {
      "anyOf": [
       {
        "type": "number",
        "maximum": 1000000000,
        "minimum": 0
       },
       {
        "type": "null"
       }
      ],
      "title": "Reported Total Item Volume",
      "default": null
     },
     "reported_monthly_storage_fee": {
      "type": "number",
      "title": "Reported Monthly Storage Fee",
      "maximum": 
… (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-monthly-storage-fee-verifier-b374569a/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)