# Friday Seller Tools – Amazon FBA vs FBM Cost Comparison

> Friday Seller Tools – Amazon FBA vs FBM Cost Comparison 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 and compares Amazon FBA (Fulfillment by Amazon) versus FBM (Fulfilled by Merchant) costs for a given product to help sellers choose the most profitable fulfillment method.

## Facts

- Endpoint: POST https://friday-seller-tools-production.up.railway.app/v1/amazon/fulfillment/fba-vs-fbm-costs
- 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-vs-fbm-cost-comparison-a80d90b4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6Mlw6s6tLHSkROe4hAZM5

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-vs-fbm-cost-comparison-a80d90b4 -d '<json body>'
```

Example prompt: For my Amazon listing — a 2 lb kitchen gadget selling for $34.99 in the Kitchen & Dining category with dimensions 10x6x4 inches — can you run an FBA vs FBM cost comparison so I can see which fulfillment method is more profitable?

## When to prefer this

Use this endpoint when an Amazon seller needs a data-driven decision on whether FBA or FBM is more cost-effective for a specific SKU, especially for products where weight, size, or category dramatically affect FBA fee tiers. Prefer this over generic fee calculators when you need a side-by-side net margin comparison rather than just raw fee lookup.

## Known failure modes

- Missing required product dimensions or weight returns a 400 validation error
- Invalid or unrecognized product category causes incorrect fee calculation
- Extremely large or oversize items may fall outside standard FBA tier calculations
- Job may remain queued if processing backend is under load, requiring polling by job_id
- Incorrect selling price inputs lead to misleading margin estimates

## 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, with the eventual result containing a detailed cost breakdown comparing FBA fees (Amazon pick/pack, storage, referral) against FBM costs (seller-borne shipping, handling), along with a net profit comparison and a recommendation for which fulfillment method yields higher margins for the given product.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "skus": {
   "type": "array",
   "items": {
    "type": "object",
    "title": "FbaFbmSkuInput",
    "required": [
     "sku",
     "product_name",
     "sale_price",
     "product_cost_per_unit",
     "referral_fee_percent",
     "monthly_units",
     "fba",
     "fbm"
    ],
    "properties": {
     "fba": {
      "type": "object",
      "title": "FbaCostInputs",
      "required": [
       "fulfillment_fee_per_unit"
      ],
      "properties": {
       "monthly_fixed_cost": {
        "type": "number",
        "title": "Monthly Fixed Cost",
        "default": 0,
        "maximum": 10000000,
        "minimum": 0
       },
       "storage_per_unit_month": {
        "type": "number",
        "title": "Storage Per Unit Month",
        "default": 0,
        "maximum": 1000000,
        "minimum": 0
       },
       "prep_and_label_per_unit": {
        "type": "number",
        "title": "Prep And Label Per Unit",
        "default": 0,
        "maximum": 1000000,
        "minimum": 0
       },
       "fulfillment_fee_per_unit": {
        "type": "number",
        "title": "Fulfillment Fee Per Unit",
        "maximum": 1000000,
        "minimum": 0
       },
       "inbound_shipping_per_unit": {
        "type": "number",
        "title": "Inbound Shipping Per Unit",
        "default": 0,
        "maximum": 1000000,
        "minimum": 0
       },
       "other_variable_cost_per_unit": {
        "type": "number",
        "title": "Other Variable Cost Per Unit",
        "default": 0,
        "maximum": 1000000,
        "minimum": 0
       }
      },
      "additionalProperties": false
     },
     "fbm": {
      "type": "object",
      "title": "FbmCostInputs",
      "required": [
       "outbound_shipping_per_unit"
      ],
      "properties": {
       "monthly_fixed_cost": {
        "type": "number",
        "title": "Monthly Fixed Cost",
        "default": 0,
        "maximum": 10000000,
        "minimum": 0
       },
       "packaging_per_unit": {
        "type": "number",
        "title": "Packaging Per Unit",
        "default": 0,
        "maximum": 1000000,
        "minimum": 0
       },
       "pick_and_pack_per_unit": {
        "type": "number",
        "title": "Pick And Pack Per Unit",
        "default": 0,
        "maximum": 1000000,
        "minimum": 0
       },
       "storage_per_unit_month": {
        "type": "number",
        "title": "Storage Per Unit Month",
        "default": 0,
        "maximum": 1000000,
… (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-vs-fbm-cost-comparison-a80d90b4/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)