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
Low risk
We rate an entry low when it mostly gives the agent instructions and reference material.
Why this level
- Only formulas and UI patterns for building a calculator; it does not touch real marketplace accounts
spenkovaanna895-dotcom/building-marketplace-unit-calculators
Install
In your terminal, with SkillFoxx CLI
npx skillfoxx add skills/building-marketplace-unit-calculatorsDetects the agents on your machine, checks the risk and pins the version.
Other ways to install
Run in a terminal in the project folder
npx skills add spenkovaanna895-dotcom/building-marketplace-unit-calculators --skill building-marketplace-unit-calculators -a claude-code -yThe skills tool installs the current version from the repository. Add the -g flag to use the skill in every project.
Run in a terminal in the project folder
npx skills add spenkovaanna895-dotcom/building-marketplace-unit-calculators --skill building-marketplace-unit-calculators -a cursor -yThe skills tool installs the current version from the repository. Add the -g flag to use the skill in every project.
Run in a terminal in the project folder
npx skills add spenkovaanna895-dotcom/building-marketplace-unit-calculators --skill building-marketplace-unit-calculators -a github-copilot -yThe skills tool installs the current version from the repository. Add the -g flag to use the skill in every project.
Run in a terminal in the project folder
npx skills add spenkovaanna895-dotcom/building-marketplace-unit-calculators --skill building-marketplace-unit-calculators -a codex -yThe skills tool installs the current version from the repository. Add the -g flag to use the skill in every project.
Run in a terminal in the project folder
npx skills add spenkovaanna895-dotcom/building-marketplace-unit-calculators --skill building-marketplace-unit-calculators -a gemini-cli -yThe skills tool installs the current version from the repository. Add the -g flag to use the skill in every project.
Run in a terminal in the project folder
npx skills add spenkovaanna895-dotcom/building-marketplace-unit-calculators --skill building-marketplace-unit-calculators -a cline -yThe skills tool installs the current version from the repository. Add the -g flag to use the skill in every project.
Run in a terminal in the project folder
npx skills add spenkovaanna895-dotcom/building-marketplace-unit-calculators --skill building-marketplace-unit-calculators -a roo -yThe skills tool installs the current version from the repository. Add the -g flag to use the skill in every project.
A fork of Roo Code, same .roo folders.
Run in a terminal in the project folder
npx skills add spenkovaanna895-dotcom/building-marketplace-unit-calculators --skill building-marketplace-unit-calculators -a opencode -yThe skills tool installs the current version from the repository. Add the -g flag to use the skill in every project.
Download https://github.com/spenkovaanna895-dotcom/building-marketplace-unit-calculators and copy SKILL.md with the references folder into Claude Code's skills directory, then ask it to build the calculator from the described model.
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 calculationsLimitations
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.
Security check
- Only formulas and UI patterns for building a calculator; it does not touch real marketplace accounts
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.
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 ```
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.
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