# Friday Seller Tools – Amazon FBA Fee Discrepancy Audit

> Friday Seller Tools – Amazon FBA Fee Discrepancy Audit is a paid API for AI agents from friday-seller-tools-production.up.railway.app, paid per call via x402, $1/call, status unknown (last checked 2026-09-15).

Audits Amazon FBA seller accounts to identify fee discrepancies, overcharges, and reimbursement opportunities.

## Facts

- Endpoint: POST https://friday-seller-tools-production.up.railway.app/v1/amazon/fba/fee-discrepancy-audit
- Price: $1/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-fee-discrepancy-audit-af6d54e0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-Tw65EO78AfHN36148iD4

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-fee-discrepancy-audit-af6d54e0 -d '<json body>'
```

Example prompt: Can you run an FBA fee discrepancy audit on my Amazon seller account and tell me if I've been overcharged on any fulfillment fees so I can file for reimbursements?

## When to prefer this

Choose this endpoint when you need to proactively identify Amazon FBA fee overcharges and reimbursement opportunities at low cost ($1 per audit). It is best suited for Amazon sellers who want to reconcile FBA fees, prepare for accounting, or routinely audit fulfillment charges without building in-house tooling. Prefer this over generic accounting tools when the specific goal is Amazon FBA fee discrepancy detection and reimbursement identification.

## Known failure modes

- Missing or invalid Amazon seller credentials returns an authentication error
- Malformed or incomplete order/shipment data causes audit to fail during processing
- Rate limiting or quota exhaustion from Amazon data retrieval delays or fails the job
- Job times out if the account has an unusually large volume of transactions
- No discrepancies found returns an empty result set, which may be mistaken for an error

## 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 status (initially 'queued'), indicating the audit has been submitted for asynchronous processing. The completed job will surface a structured report detailing identified fee discrepancies, overcharge amounts by category, and actionable reimbursement opportunities against Amazon FBA charges.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "records": {
   "type": "array",
   "items": {
    "type": "object",
    "title": "FbaFeeDiscrepancyRecord",
    "required": [
     "record_reference",
     "sku",
     "fee_preview_size_tier",
     "fee_preview_longest",
     "fee_preview_median",
     "fee_preview_shortest",
     "fee_preview_unit_weight",
     "fee_preview_referral_fee",
     "fee_preview_fulfillment_fee",
     "measured_longest",
     "measured_median",
     "measured_shortest",
     "measured_unit_weight",
     "your_price"
    ],
    "properties": {
     "sku": {
      "type": "string",
      "title": "Sku",
      "maxLength": 120,
      "minLength": 1
     },
     "asin": {
      "anyOf": [
       {
        "type": "string",
        "maxLength": 20,
        "minLength": 1
       },
       {
        "type": "null"
       }
      ],
      "title": "Asin",
      "default": null
     },
     "unit_cost": {
      "anyOf": [
       {
        "type": "number",
        "maximum": 1000000,
        "minimum": 0
       },
       {
        "type": "null"
       }
      ],
      "title": "Unit Cost",
      "default": null
     },
     "your_price": {
      "type": "number",
      "title": "Your Price",
      "maximum": 1000000,
      "exclusiveMinimum": 0
     },
     "monthly_units": {
      "type": "integer",
      "title": "Monthly Units",
      "default": 0,
      "maximum": 10000000,
      "minimum": 0
     },
     "measured_median": {
      "type": "number",
      "title": "Measured Median",
      "maximum": 1000,
      "exclusiveMinimum": 0
     },
     "measured_longest": {
      "type": "number",
      "title": "Measured Longest",
      "maximum": 1000,
      "exclusiveMinimum": 0
     },
     "record_reference": {
      "type": "string",
      "title": "Record Reference",
      "maxLength": 120,
      "minLength": 1
     },
     "measured_shortest": {
      "type": "number",
      "title": "Measured Shortest",
      "maximum": 1000,
      "exclusiveMinimum": 0
     },
     "fee_preview_median": {
      "type": "number",
      "title": "Fee Preview Median",
      "maximum": 1000,
      "exclusiveMinimum": 0
     },
     "target_unit_margin": {
      "anyOf": [
       {
        "type": "number",
        "maximum": 1000000,
        "minimum": 0
       },
       {
        "type": "null"
       }
      ],
      "title": "Target Unit Margin",
      "default": null
     },
     "fee_preview_longest": {
      "type": "number",
      "title": "Fee Preview
… (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-fee-discrepancy-audit-af6d54e0/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)