# Amazon FBA Unit Economics & Breakeven ACOS Calculator

> 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.

## Facts

- Endpoint: GET https://x402-niche-briefs.fly.dev/v1/fba-fee-margin-calc?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/amazon-fba-unit-economics-breakeven-acos-calculator-7f6adc82
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iBUxakXyxMdsAi61g0f9t

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 amazon-fba-unit-economics-breakeven-acos-calculator-7f6adc82
```

Example prompt: Can you run the FBA unit economics calc for a product I'm selling at $29.99 with a COGS of $6.50, packaged weight of 12 oz, and a 15% referral fee — I need the breakeven ACOS, breakeven ROAS, and what target ACOS I should set to hit a 15% net margin?

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "price_usd",
      "cogs_usd",
      "weight_oz"
     ],
     "properties": {
      "cogs_usd": {
       "type": "string",
       "description": "Landed cost of goods sold per unit in USD"
      },
      "price_usd": {
       "type": "string",
       "description": "Retail sale price in USD"
      },
      "weight_oz": {
       "type": "string",
       "description": "Packaged unit shipping weight in ounces"
      },
      "referral_pct": {
       "type": "string",
       "description": "Amazon category referral fee percentage (default 15)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "$schema": "https://json-schema.org/draft/2020-12/schema",
     "required": [
      "as_of",
      "inputs",
      "estimated_size_tier",
      "fee_breakdown_usd",
      "unit_economics",
      "disclaimer"
     ],
     "properties": {
      "as_of": {
       "type": "string"
      },
      "inputs": {
       "type": "object",
       "required": [
        "price_usd",
        "cogs_usd",
        "weight_oz",
        "referral_pct"
       ],
       "properties": {
        "cogs_usd": {
         "type": "number"
        },
        "price_usd": {
         "type": "number"
        },
        "weight_oz": {
         "type": "number"
        },
        "referral_pct": {
         "type": "number"
        }
       }
      },
      "disclaimer": {
       "type": "string"
      },
      "unit_economics": {
       "type": "object",
       "required": [
        "net_pre_ad_contribution_usd",
        "net_pre_ad_margin_pct",
        "breakeven_acos_pct",
        "breakeven_roas",
        "target_acos_for_15pct_net_profit",
        "health_verdict"
       ],
       "properties": {
        "breakeven_roas": {
         "type": "number"
        },
        "health_verdict": {
         "type": "string"
        },
        "breakeven_acos_pct": {
         "type": "numbe
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/amazon-fba-unit-economics-breakeven-acos-calculator-7f6adc82/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-niche-briefs.fly.dev](https://www.zero.xyz/host/x402-niche-briefs.fly.dev/llms.txt)