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Pay once · No Friday subscription

FBA Monthly Storage Fee Charge Verifier

Recompute every storage-fee row and surface the ones that don't add up.

Amazon US

Included in the $9.00 Shelf Kit

Agent/API — $0.50
Review-first
Every output stays a draft. No credentials
No seller-account login required. Private delivery
Inputs expire after 24 hours. Clear recourse
Digital-service refund policy.

What you receive

  • Recomputed total item volume, base fee, and monthly fee for every row
  • Reported-vs-recomputed volume, base-fee, and total-fee discrepancies
  • Overcharge amount per row and net overcharge exposure across the report
  • High-cost ASINs flagged against your own threshold
  • A priority queue ranked mismatches-first by discrepancy size

Who it is for

Amazon FBA sellers, agencies, and agents triaging a seller-supplied Monthly Storage Fees export before a human requests a remeasurement or reviews a charge.

Delivery: usually a structured result, workbook, or ZIP depending on the tool.

How it stays safe

Friday performs arithmetic only on the item volumes, average quantities, storage rates, incentive amounts, and reported fees you supply. It reads no Amazon account, fee schedule, storage rate card, or Storage Fees report. A flagged row is a difference between your own reported and recomputed numbers for human review — not a finding that Amazon's measurement or charge is wrong. Friday opens no case, files no dispute, requests no remeasurement, changes no price or inventory, and does not publish listings or change a seller account.

Synthetic sample

See the deliverable structure before buying

{
  "row_count": 3,
  "total_reported_fee": 1643.5,
  "total_recomputed_fee": 1569.5,
  "total_fee_discrepancy": 74.0,
  "net_overcharge_exposure": 74.0,
  "mismatch_count": 2,
  "high_cost_count": 2,
  "rows_preview": [
    {
      "priority_rank": 1,
      "asin": "B0NORTH002",
      "month_of_charge": "2026-07",
      "recomputed_total_item_volume": 240.0,
      "recomputed_base_storage_fee": 576.0,
      "recomputed_monthly_storage_fee": 526.0,
      "reported_monthly_storage_fee": 600.0,
      "total_fee_discrepancy": 74.0,
      "overcharge_amount": 74.0,
      "has_mismatch": true,
      "high_cost": true,
      "status": "review_math"
    }
  ],
  "publish_status": "draft_needs_review",
  "safety": "Arithmetic on seller-supplied volumes, storage rates, incentives, and reported fees only. A mismatch is a difference between the seller's own numbers, not a finding that Amazon is wrong; no case is opened and no listing, price, or account is changed."
}

This sample uses synthetic facts. Your output is generated only from the facts you submit.

Agent API and x402 details

POST /v1/amazon/fba/monthly-storage-fee-verifier

Exact x402 price: $0.50. Use the public OpenAPI schema and Base USDC payment flow. The response returns a private job URL and temporary token.

Open the API documentation →

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