Merckit
Digital margin workflows for marketplace sellers

See true profit before you scale a SKU.

Merckit gives Amazon, Mercado Libre and Mercado Livre sellers a clean unit economics workflow for fees, fulfillment, ads, returns, taxes, break-even price and contribution profit by SKU.

View productsSee how it works
Brazil in PortugueseLatin America in SpanishUS, Canada, and global in EnglishDigital delivery by email
Mercado LibreAmazon
Net margin18.7%+3.2 pts
Ad share9.4%+1.1 pts
Break-even price$31Stable
  • Marketplace fee13.5%
  • Fulfillment$4.80
  • Ads per order$2.10
  • Contribution profit$8.42
FeesMarketplace commission, payment cost, FBA or shipping subsidy.
TrafficPPC, ads per order, coupons, discounts and promotion pressure.
ProfitBreak-even price, contribution profit and margin room by SKU.
CashInventory decisions, reorder caution and SKU profit quality.

Built for the decisions sellers make every week.

Use one structured model to decide what to reprice, what to scale, what to pause, and which inventory buys deserve caution.

SKU-level margin

Track product margin after marketplace fees, logistics, payment costs, ads, returns, and taxes.

Price scenarios

Model price changes, discounts, shipping options, and promotion mechanics before launching them.

Advertising impact

See how campaign spend changes unit economics and where growth turns into profit leakage.

Marketplace connectors

Prepare for Mercado Libre, Mercado Livre, and Amazon data flows from one account model.

Tax-ready structure

Keep taxes and regional cost assumptions visible instead of burying them in spreadsheets.

Cash flow view

Understand payables, receivables, inventory pressure, and cash conversion across channels.

What you receive

A practical workflow, not another generic calculator.

Each product is structured around the decisions marketplace sellers actually face: whether to change price, fund ads, reorder stock, run discounts, or stop pushing a weak SKU.

InputsCost, price, fees, fulfillment, taxes, returns, ads and discounts.
ScenariosBreak-even, discount pressure, ad spend sensitivity and margin room.
OutputContribution profit, weak-SKU signals and cleaner scaling decisions.
DeliveryDigital delivery and onboarding questions through the checkout email.

From order to digital delivery.

Choose the marketplace table, complete checkout, then receive the digital workflow and onboarding questions by email.

01

Choose the table

Pick the product for your marketplace: Mercado Libre / Mercado Livre or Amazon.

02

Complete checkout

Your order records the selected digital product, checkout email, marketplace, SKU count, and margin problem.

03

Receive the workflow

Delivery starts through the checkout email with the table workflow and seller onboarding questions. No physical item is shipped.

Revenue can grow while margin gets weaker.

Merckit focuses on the cost lines that decide whether a sale is worth scaling: marketplace fees, fulfillment, ads, returns, taxes and inventory cash pressure.

The useful question is not only how much you sold.

The useful question is what remains after the marketplace, logistics, ads and operating assumptions take their share. That is why each table is built around SKU-level contribution profit.

SignalRevenue dashboardMerckit view
SKU decisionSales volumeContribution profit and break-even price
AdsCampaign spendAd cost per order vs margin room
InventoryStock and revenueCash pressure and SKU profit quality

Choose your marketplace table.

Two focused digital products. No shipping, no vague subscription promise: choose the workflow that matches your marketplace and receive the onboarding by checkout email.

Mercado Libre

Unit economics table

$29

For Mercado Libre and Mercado Livre sellers checking SKU margin, fees, shipping, ads, taxes, and break-even price.

  • Commission and payment fee model
  • Shipping subsidy scenarios
  • Contribution profit by SKU
Open Mercado table
Amazon

Unit economics table

$29

For Amazon sellers modeling referral fees, FBA, ads, returns, coupons, inventory pressure, and break-even price.

  • FBA and referral fee model
  • ACOS and contribution profit view
  • Inventory cash pressure signals
Open Amazon table

Marketplace finance notes.

Use the blog to capture SEO demand around Mercado Libre, Amazon fees, margins, and seller profitability.

Before the next ad push or inventory order, check the unit math.

Choose the table for your marketplace and use a cleaner margin model before scaling the wrong SKU.

Choose a digital product