Seller guide
How do I preflight an Amazon Prime Exclusive Discount price and margin?
Test a planned Prime-exclusive price against seller-supplied reference-price rules and unit economics without claiming Amazon eligibility or changing a promotion.
Freeze the exact price-rule set you intend to test
Before calculating, copy the current rules visible to the seller and date the source. For each planned SKU, record current price, planned Prime price, seller price floor, the required minimum discount, and each applicable reference-price comparison, such as a seller-supplied non-member price or 30-day-lowest value. Confirm that the rule set is current for the marketplace and event. Do not embed remembered thresholds or treat one promotion's rejection message as a universal Amazon rule.
Turn supplied rules into transparent price ceilings
Calculate planned discount percent from current and planned prices. Convert the supplied minimum-discount percent into the highest whole-cent planned price that satisfies it. For a strict must-be-below reference, use the supplied reference minus one cent as that rule's ceiling. Keep every ceiling and named failure visible. If a required reference is absent, stop that row as incomplete rather than assuming the planned price passes.
Build a separate seller margin floor
From the planned price, subtract the seller-supplied percentage fee rounded to cents, fixed fee, product cost, fulfillment cost, and other variable cost. Compare the result with the seller's minimum contribution. Search upward by whole cents for the first price that satisfies the contribution floor, then take the greater of that amount and the seller's explicit price floor. This effective floor is arithmetic on supplied economics, not a recommended sale price.
Detect an infeasible rule-and-margin window
Compare the effective seller floor with the lowest applicable supplied-rule ceiling. If the floor is higher, no whole-cent price can satisfy both sets of submitted assumptions; mark the row infeasible instead of suggesting a compromise that violates one. Otherwise classify supplied-rule failures, margin failures, combined failures, and arithmetic passes separately. Rank infeasible and combined rows first so a human can review the largest constraint conflicts before preparing a promotion file.
Verify Amazon's current decision inputs before submission
Recheck current reference prices, enrollment, inventory, ratings, reviews, category, suppression status, event dates, and any program conditions omitted from the bounded input. A supplied-check pass does not determine Amazon eligibility or prove policy compliance, and the arithmetic predicts no sales lift. Friday reads no Amazon account, creates no discount, changes no price, listing, inventory, promotion, or account, and publishes no listing; the result is a human-review preflight only.
Tools that help with this
Prices below are exact x402 per-call prices. Human card checkout uses fixed $3, $9, and $29 bundles; follow a tool page to see its applicable bundle.
- Amazon Prime Exclusive Discount Eligibility + Margin Preflight ($0.50) — Compare supplied Amazon price rules with a seller contribution floor
- Marketplace Promotion Profit Guard ($0.25) — Compare the planned promotion with a baseline contribution scenario
- Marketplace Price Change Break-Even Analyzer ($0.25) — Inspect the unit-volume lift needed after a separate verified price change
Every paid output is a draft for your review before you publish, appeal, or activate anything. Friday does not access your seller account.
More seller guides
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- How do I calculate coupon ROI after marketplace fees?
- How do I compare Amazon FBA vs FBM costs?