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Friday Seller Tools – Promotion Profit Guard
x402
Friday Seller Tools – Promotion Profit Guard 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 whether a planned promotional discount or deal on a marketplace listing remains profitable after fees, COGS, and advertising costs.
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; the async result includes a profitability verdict (profitable/break-even/loss), calculated net margin at the promotional price, unit economics breakdown (revenue minus COGS, fees, and ad spend), and a recommended minimum price floor to hit the target margin.
Example use cases
Amazon lightning deal margin check
“I want to run a lightning deal on my silicone baking mat — it costs me $8 to make, I normally sell it for $24.99, Amazon takes 15% referral fee plus $3.20 FBA fee, and I spend $1.80 per unit on sponsored ads. Run the Promotion Profit Guard to see if a 30% discount still leaves me with at least a 10% net margin.”
Black Friday Shopify sale profitability
“Before I launch my Black Friday sale on Shopify, check if a 40% discount on my $49 yoga mat is still profitable — my COGS is $14, Shopify payment fees are 2.9% plus $0.30, and I'm planning to spend $500 on Facebook ads expecting 200 units sold.”
Walmart promotional price floor calculation
“I'm about to submit a Walmart rollback promotion for my kitchen scale — it costs me $11.50, normally lists at $29.99, and Walmart charges a 10% referral fee. Use the Promotion Profit Guard to find the lowest promotional price I can set without dipping below a 12% profit margin.”
Technical details
Endpoint
POSThttps://friday-seller-tools-production.up.railway.app/v1/pricing/promotion-profit-guardWhen to prefer
Use this endpoint when a seller needs to quickly validate whether a planned promotion, coupon, or markdown on Amazon, Walmart, Shopify, or eBay will remain profitable after accounting for platform fees, cost of goods, and advertising spend. Prefer it over generic margin calculators because it is natively aware of multi-marketplace fee structures and advertising cost inputs in a single call at $0.25 per check.
Side effects
- Missing required cost or pricing inputs returns a validation error
- Promotional price lower than COGS causes an immediate loss flag
- Invalid marketplace fee structure triggers a schema error
- Async job may queue with delayed result if service is under load
- Negative margin targets or zero-price inputs may return a 400 bad request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| scenarios | array | |
| unit_cost | number | |
| list_price | number | |
| marketplace | string | |
| product_name | string | |
| referral_fee_percent | number | |
| fulfillment_cost_per_unit | number |
Output
Schema · Response
{
"type": "json",
"example": {
"job_id": "example",
"status": "queued"
}
}Tags
x402
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