SkillFoxx

A skill for building a WB/Ozon unit-economics calculator

building-marketplace-unit-calculators

A Claude Code skill with formulas and UX patterns for building a Wildberries/Ozon seller unit-economics calculator, including a Telegram Mini App version

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Skill

Minimal access

Why this level

  • Only formulas and UI patterns for building a calculator; it does not touch real marketplace accounts
All reasons and checks
Russian stack

spenkovaanna895-dotcom/building-marketplace-unit-calculatorsAuthor:spenkovaanna895-dotcom

Install

In your terminal, with SkillFoxx CLI

npx skillfoxx add skills/building-marketplace-unit-calculators

Detects the agents on your machine, shows the access level and pins the version.

Other ways to install

Access and checks

How we review

Minimal accessThe tool runs nothing and makes no network calls.

  • Only formulas and UI patterns for building a calculator; it does not touch real marketplace accounts

This is third-party code. Review the repository files before installing.

What it does

The skill does not compute unit economics itself; it gives an agent the calculation model and UI patterns for building such a calculator: the realized price is primary, with the showcase price and marketplace discount derived from it, plus logistics adjusted for the buyout rate, Russian tax regimes, and a break-even point. The full formula model lives in references/calc-model.md, and Telegram Mini App UI patterns, including visualizing a loss and linking the showcase and real price, are in references/telegram-mini-app.md.

Who it is for. For developers building a unit-economics calculator for Wildberries and Ozon sellers, including as a Telegram Mini App.

Good fit when

  • You need to calculate per-unit profit, margin, ROI or break-even for WB or Ozon
  • The calculation involves the marketplace discount, buyout rate, reverse logistics or Russian tax regimes
  • The tool needs to run inside Telegram as a Mini App

Not a fit when

  • You need actual bookkeeping from marketplace reports rather than a single-unit model
  • You need multi-product portfolio analytics rather than a single-product calculation
  • You need a ready calculator rather than formulas and UI patterns to build one from

Example request

Build a unit-economics calculator for a Wildberries and Ozon seller with the marketplace discount, buyout rate and simplified-tax calculations

Limitations

The skill gives a model and formulas, not a ready app: the agent has to build the calculator and Telegram Mini App itself following the instructions. The model targets a single product, not portfolio analytics or actual bookkeeping. The tax regimes are limited to the ones named in the README: simplified income tax, simplified income-minus-expenses tax, and VAT.

How to disable. Remove the skill folder from the agent's skills directory.

FAQ

Will the skill calculate my unit economics itself?

No, it is an instruction for an agent to build a calculator, not a ready calculator or service.

Why does the model start from the realized price rather than the showcase price?

The author frames this as the main calculation mistake: the marketplace pays the discount down to the showcase price, and it does not affect the seller's profit.

Discussion

No questions or reviews yet.

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README in short

There is no separate README; SKILL.md serves as both instructions and description: it explains the model's core idea, when to apply the calculation, gives shortened formulas right in the text, and a table of UI patterns that make a loss and the price structure clear to the user. The full formulas and Telegram patterns are split into separate references files.

README badge

Original SKILL.md

---
name: building-marketplace-unit-calculators
description: Use when building a unit-economics or profitability calculator for marketplace sellers (Wildberries, Ozon) — margin per unit, marketplace commission, SPP discount, logistics with buyout rate, Russian tax regimes — or when shipping such a calculator as a Telegram Mini App.
---

# Калькулятор юнит-экономики для маркетплейсов

Продавец на маркетплейсе видит выручку, а не заработок. Ядро всей модели: цена реализации первична, витринная цена — производная от нее. Комиссия, ДРР и налоги считаются от цены реализации.

```
showcase   = price × (1 − спп/100)
logistics  = log/b + rlog × (1 − b)/b
expenses   = cost + commission + acquiring + ads + logistics + ful + varc
profit     = price − expenses − taxes
```

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