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Friday Seller Tools – Amazon FBA vs FBM Cost Comparison
x402
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.
Price / call$0.5
Success—
StatusUnknown
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.
Example use cases
Heavy product FBA profitability check
“I'm selling a 15 lb electric standing desk on Amazon for $189. It's bulky — 48x24x6 inches. Can you compare what FBA would cost me versus shipping it myself as FBM so I can figure out which one actually leaves me more margin?”
New seller fulfillment decision
“I'm launching my first Amazon product — a set of silicone baking mats, 1.2 lbs, 14x10x2 inches, selling for $22.99 in the Kitchen category. Can you calculate the FBA fees versus what it would cost me to fulfill by merchant so I know which way to go?”
Switching fulfillment method evaluation
“I'm currently doing FBM for my $45 yoga mat (3 lbs, 26x6x6 inches, Sports & Outdoors category) but considering switching to FBA. Can you show me a side-by-side cost breakdown so I can see if FBA would actually save me money?”
Technical details
Endpoint
POSThttps://friday-seller-tools-production.up.railway.app/v1/amazon/fulfillment/fba-vs-fbm-costsWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| skus | array | |
| marketplace | string |
Output
Schema · Response
{
"type": "json",
"example": {
"job_id": "example",
"status": "queued"
}
}Tags
x402
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