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Pay once · No Friday subscription

Coupon and Deal Incremental ROI Calculator

See whether discounted volume actually beat a comparable full-price period.

Amazon USWalmart USShopifyeBay US

Included in the $9.00 Shelf Kit

Agent/API — $0.25
Review-first
Every output stays a draft.
No credentials
No seller-account login required.
Private delivery
Inputs expire after 24 hours.
Clear recourse
Digital-service refund policy.

What you receive

  • Baseline and discounted contribution per unit
  • Comparable-period unit lift and contribution change
  • Discount, redemption, fixed-fee, and campaign investment
  • Incremental ROI on the supplied promotion investment
  • Break-even discounted units and required unit lift

Who it is for

Sellers, agencies, and agents evaluating one completed or planned coupon/deal period against seller-supplied comparable baseline economics.

Delivery: usually a structured result, workbook, or ZIP depending on the tool.

How it stays safe

Friday performs arithmetic only on the comparable-period units, price, discount, and costs you supply. Unit lift is not causal attribution and scenario volume is not a forecast. Friday fetches no fees, returns, taxes, ad attribution, customer data, or account state; does not publish listings; and does not create, change, activate, or publish any coupon, deal, price, campaign, or listing. This is not accounting, tax, financial, pricing, or promotion advice.

Synthetic sample

See the deliverable structure before buying

{
  "publish_status": "draft_needs_review",
  "discounted_price": 27.0,
  "baseline_contribution_per_unit": 11.5,
  "discounted_contribution_per_unit": 8.35,
  "baseline_period_contribution": 920.0,
  "deal_period_contribution": 1102.5,
  "incremental_contribution": 182.5,
  "unit_lift": 70,
  "unit_lift_percent": 87.5,
  "promotion_investment": {
    "discount": 450.0,
    "redemption_fees": 90.0,
    "fixed_and_campaign": 150.0,
    "total": 690.0
  },
  "incremental_roi_percent": 26.4,
  "break_even_discounted_units": 129,
  "break_even_unit_lift": 49,
  "break_even_unit_lift_percent": 61.3,
  "verdict": "positive_incremental_return",
  "safety": "Seller-supplied comparable-period arithmetic only; unit lift is not causal attribution, no demand is forecast, and no promotion is activated."
}

This sample uses synthetic facts. Your output is generated only from the facts you submit.

Agent API and x402 details

POST /v1/pricing/deal-roi

Exact x402 price: $0.25. Use the public OpenAPI schema and Base USDC payment flow. The response returns a private job URL and temporary token.

Open the API documentation →

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