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Amazon FBA Unit Economics & Breakeven ACOS Calculator
x402
Amazon FBA Unit Economics & Breakeven ACOS Calculator is a paid API for AI agents from x402-niche-briefs.fly.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).
Calculates Amazon FBA fees, net pre-ad contribution margin, breakeven ACOS, breakeven ROAS, and target ACOS for a 15% net margin given a product's price, COGS, and weight.
Price / call$0.01
Success—
StatusUnknown
How this service works
Deterministic Amazon FBA unit economics calculator. Pass ?price_usd=29.99&cogs_usd=6.50&weight_oz=12&referral_pct=15. Returns size tier, referral fee, estimated FBA fulfillment + storage fee, net pre-ad contribution ($ and %), breakeven ACOS %, breakeven ROAS, and target ACOS for a 15% net margin.
Output
Returns a JSON object with: the detected FBA size tier, an itemized fee breakdown (referral fee, FBA fulfillment fee, estimated storage and inbound placement fee, total Amazon fees in USD), unit economics summary (net pre-ad contribution in USD and %, breakeven ACOS %, breakeven ROAS, target ACOS for 15% net profit, and a health verdict), plus the echoed inputs and a disclaimer about fee estimate accuracy.
Example use cases
New product launch profitability check
“I'm about to launch a silicone kitchen spatula on Amazon priced at $14.99, my landed COGS is $3.20, it weighs 8 oz packed, and it's in the kitchen category at 15% referral. Can you tell me my estimated FBA fees, breakeven ACOS, and whether the margins are healthy enough to run ads?”
PPC budget planning for existing listing
“I sell a yoga mat on Amazon for $39.95, my COGS is $11.00, it weighs 48 oz, and the referral fee is 15%. What's my breakeven ACOS and target ACOS to maintain a 15% net profit margin so I can set my Amazon PPC bids correctly?”
Comparing two price points for a product
“I'm deciding between pricing my water bottle at $18.99 or $22.99 on Amazon — COGS is $5.00, weight is 10 oz, 15% referral fee. Run the FBA unit economics for $18.99 so I can see the breakeven ROAS and net margin at that price point.”
Technical details
Endpoint
GEThttps://x402-niche-briefs.fly.dev/v1/fba-fee-margin-calc?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, deterministic Amazon FBA unit economics snapshot without building your own fee-lookup logic. It is ideal for product research, PPC budget planning, and sourcing decisions where you need breakeven ACOS and ROAS alongside fee estimates in a single call. Prefer this over manual fee calculators when automating product profitability screening at scale or integrating FBA economics into an agent workflow.
Side effects
- Missing required parameters (price_usd, cogs_usd, weight_oz) returns a 400 error
- Non-numeric or negative values for price/COGS/weight may cause validation errors
- Extremely high weights may fall outside standard FBA size tier tables, reducing accuracy
- Fee estimates may lag behind Amazon's published rates if not recently updated
- COGS higher than price produces negative margins with a poor health verdict
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
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