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True profit
Track what stock cost, what sold, selling costs and the money actually left.
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Limited launch offer: first 2 months freeCreate your account and try MyCost Pro for 60 days. No card needed to get started.
Claim the offer → Built for UK resellers
Know what you're making. Know what to do next.
MyCost keeps your stock, costs, sales and real profit together — then gives you practical reseller tools and a free help centre when you need an answer.
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Official eBay APIs · Etsy Open API commercial access · Marketplace connections optional
MyCost Reseller Help Centre
Don't hunt around the site. Start here.
Search 141 free guides and calculators covering Vinted, eBay, Etsy, Whatnot, sourcing, listing, shipping, UK tax, stock and profit.
116 guides25 calculators12 topic hubsFree to use
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CalculatorsProfit, ROI, fees, margins, offers and stock.25 free tools →
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VintedViews, pricing, relisting, offers, Pro and tax.12 guides →
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eBayFees, listings, sold data, ads, offers and profit.14 guides →
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EtsyFees, listings, pricing and seller workflows.10 guides →
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WhatnotShows, fees, inventory and live-selling basics.8 guides →
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SourcingBuying stock, job lots, brands and max buy prices.12 guides →
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Listings & photosTitles, photos, descriptions and conversion.10 guides →
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UK reseller taxRecords, reporting, turnover and tax basics.10 guides →
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Stock & inventorySKUs, storage, dead stock and sell-through.10 guides →
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Postage & shippingPackaging, postage costs and dispatch.8 guides →
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Business guidesProfit, pricing, workflow and reseller growth.12 guides →
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View everythingThe complete MyCost reseller knowledge hub.Browse all 131 →
The MyCost app
One workspace for the business behind the listings.
The help centre gets people through the door. MyCost gives resellers somewhere useful to stay: stock, costs, profit, sales, marketplace activity and daily actions.
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Inventory & storage
Keep active stock, SKU, source, storage, age and sales history together.
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Action Centre
Turn stale stock, listing issues, dispatch and offers into a practical to-do list.
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Sold Guard
Protect linked listings on supported official marketplace connections.
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Seller intelligence
Use your own stock and sales data to understand what deserves attention next.
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Bales & suppliers
Measure recovery, remaining stock and supplier performance on bulk buys.
eBayOfficial APIs
EtsyOpen API · Commercial Access
VintedInventory workflows
WhatnotSales tracking
Creator programme
Already have a reseller audience?
Approved creators get MyCost Power Lifetime, a tracked referral URL and 30% recurring commission for the first 12 months on eligible paying referrals.
FAQ
Quick answers before you start.
Is MyCost free?
Yes. MyCost is free to get started, and the current launch offer gives eligible new users 60 days of MyCost Pro without a card.
Do I need to connect a marketplace?
No. You can use MyCost for stock, sales, costs, profit, bales, suppliers and other reseller workflows without connecting a marketplace.
Are the guides and calculators free?
Yes. The reseller help centre and calculators are public and free to use.
Does MyCost use official marketplace APIs?
Supported eBay functionality uses eBay OAuth and official APIs. Etsy connectivity uses Etsy OAuth and the Etsy Open API with Commercial Access approved.