Pay once · No Friday subscription
See whether a planned Mercari discount still clears your contribution floor.
Included in the $9.00 Shelf Kit
Mercari sellers screening planned offers or Promote price cuts against their own fees, shipping costs, and contribution floor before a human decides whether to send or apply anything.
Delivery: usually a structured result, workbook, or ZIP depending on the tool.
Friday performs per-sale arithmetic only on the seller-supplied listing aliases, current price, planned percent discount or offer price, selling-service and payment-processing fee terms, fee-basis additions, shipping cost, other costs, and contribution floor. It reads no Mercari account, listing, offer, sale, Balance, or fee schedule; embeds no fee or offer-eligibility term; and verifies no field. Mercari alone determines actual fees and offer rules. A below-floor result is a scenario from your inputs - not a demand, acceptance, conversion, or offer-performance forecast and not a recommendation to send an offer or set a price or discount. Friday sends no offer, sets no discount, spends nothing, changes no listing, price, shipping, inventory, Balance, or account, and does not publish listings.
Synthetic sample
{
"row_count": 5,
"total_current_listing_price": 213.0,
"total_offer_price": 179.4,
"total_offer_selling_service_fee": 18.14,
"total_offer_payment_processing_fee": 8.22,
"total_offer_fee": 26.36,
"total_seller_paid_shipping_cost": 25.0,
"total_planned_contribution": 40.04,
"total_contribution_floor_shortfall": 8.28,
"non_positive_contribution_count": 1,
"no_current_price_floor_headroom_count": 1,
"planned_discount_below_floor_count": 1,
"within_floor_count": 2,
"review_queue_preview": [
{
"priority_rank": 1,
"reference": "MOP-SCARF",
"discount_method": "offer_price",
"offer_price": 7.0,
"offer_selling_service_fee": 0.7,
"offer_payment_processing_fee": 0.7,
"planned_contribution": -2.9,
"contribution_floor_shortfall": 3.9,
"minimum_viable_offer_price_for_floor": 11.48,
"maximum_discount_percent_for_floor": 4.3333,
"status": "non_positive_contribution"
},
{
"priority_rank": 2,
"reference": "MOP-MUG",
"discount_method": "percent",
"offer_price": 14.4,
"offer_total_fee": 2.44,
"planned_contribution": 0.46,
"contribution_floor_shortfall": 2.54,
"minimum_viable_offer_price_for_floor": 17.32,
"maximum_discount_percent_for_floor": 0.0,
"status": "no_current_price_floor_headroom"
},
{
"priority_rank": 3,
"reference": "MOP-JACKET",
"discount_method": "percent",
"offer_price": 48.0,
"offer_total_fee": 6.84,
"planned_contribution": 6.16,
"contribution_floor_shortfall": 1.84,
"minimum_viable_offer_price_for_floor": 50.11,
"maximum_discount_percent_for_floor": 16.4833,
"status": "planned_discount_below_floor"
}
],
"publish_status": "draft_needs_review",
"safety": "Per-sale arithmetic on seller-supplied offer plans, two-component fee terms, shipping costs, and economics only. It predicts no demand or acceptance, reads no Mercari account, sends no offer, changes nothing, and publishes nothing."
}
This sample uses synthetic facts. Your output is generated only from the facts you submit.
POST /v1/mercari/offers/discount-margin-preflight
Exact x402 price: $0.50. Use the public OpenAPI schema and Base USDC payment flow. The response returns a private job URL and temporary token.