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Friday Seller Tools – Break-Even What-If Pricing Calculator
x402
Friday Seller Tools – Break-Even What-If Pricing Calculator is a paid API for AI agents from friday-seller-tools-production.up.railway.app, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-15).
Calculates break-even pricing scenarios and what-if analyses for marketplace sellers on Amazon, Walmart, Shopify, and eBay.
Price / call$0.25
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 immediately, with the eventual payload containing break-even price points, margin percentages, scenario comparisons, and what-if projections across different price, cost, or ad-spend inputs for the specified marketplace.
Example use cases
Amazon FBA margin sanity check
“I have a product that costs $6 landed and I want to price it at $19.99 on Amazon FBA — can you run a break-even what-if to see how much room I have after referral fees and fulfillment costs?”
Advertising budget stress test
“I'm spending $5 per unit on Amazon ads for a product I sell at $34.99 with a $10 COGS — run a what-if showing me what happens to my break-even if I cut my ad spend to $2 or raise it to $8.”
Multi-price-point profitability modeling
“I'm deciding between listing my Walmart product at $17.99, $19.99, or $22.99 — my cost is $7 and shipping is about $2.50. Can you run break-even what-ifs for each price so I can see which one actually makes sense?”
Technical details
Endpoint
POSThttps://friday-seller-tools-production.up.railway.app/v1/pricing/break-even-what-ifWhen to prefer
Choose this endpoint when a seller needs to model profitability before committing to a listing price, test the impact of changing ad spend, or validate that a product's cost structure is viable on a specific marketplace. It is purpose-built for marketplace sellers (Amazon, Walmart, Shopify, eBay) and accounts for platform-specific fee structures, unlike generic margin calculators.
Side effects
- Missing required cost or price inputs returns a 400 validation error
- Invalid marketplace identifier causes processing failure
- Negative or zero cost values may produce nonsensical results
- Job may remain queued if backend is under load, requiring polling
- Extreme input values (e.g. $0.01 cost, $10,000 price) may return edge-case results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| unit_cost | number | |
| marketplace | string | |
| product_name | string | |
| current_price | number | |
| monthly_units | integer | |
| candidate_prices | array | |
| fixed_fee_per_unit | number | |
| referral_fee_percent | number |
Output
Schema · Response
{
"type": "json",
"example": {
"job_id": "example",
"status": "queued"
}
}Tags
x402
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