Run live shows without overselling. Track real profit across every marketplace.
SellDeck is the only platform purpose-built for Whatnot resellers who also list on eBay, Depop, and Etsy. Lock cross-listings before you go live. Auto-delist the second something sells in your show. Plus QR-coded prep sheets, real-time payout imports, AI pricing on every item, and IRS-ready tax reports — in one dashboard, from $8.99/mo with a free plan.
Auto-Delist on Sale
Show Lock & Resume
Free Plan, No CC Required
Live show tools. Inventory. Pricing. Marketplaces. Tax Reports. One dashboard built for serious sellers.
Sell an item once on any marketplace and SellDeck instantly pulls it from eBay and Depop in under 60 seconds. Real-time webhook detection — not the 10-minute polling other tools use. No more suspended accounts from double sales. Etsy and Mercari sellers get a push notification to delist manually since neither marketplace exposes a usable delist API to third-party tools today.
The only platform that proactively pauses your eBay and Depop listings before you go live on Whatnot — then restores the unsold ones with one click after the show. Items sold mid-show stay sold, the rest get republished automatically. End the race condition between your live audience and external buyers for good.
Listing 5 of an item across marketplaces? When 2 sell on eBay, SellDeck automatically updates the remaining quantity on Depop — no oversell, no manual sync. Hits zero? It delists everywhere. The only way to safely run multi-stock cross-listings without losing your buyer trust score.
If an oversell ever slips through (network outage, manual override), SellDeck detects double-sales within seconds, files an incident, and offers one-click resolution: cancel the eBay order, mark a refund issued, or reach out to the buyer. Audit trail and resolution status preserved — turn account-suspending mistakes into 60-second fixes.
Track every item with photos, SKU, cost basis, and categories. Bulk CSV import, status tracking (draft, ready, live, sold), and a mobile quick-add mode for adding items on the go — perfect for sourcing trips and flea markets.
Get instant AI price estimates from your item details — title, category, condition, and tags (which AI can also auto-fill from a photo). Real-time eBay sold listings via official API for accurate market comps. Price history tracking.
Schedule Whatnot shows, assign items with drag-and-drop ordering, and generate printable prep sheets with QR codes for instant lookup during live selling.
Monitor your Whatnot show in real time. See revenue, orders, unique buyers, and a live sales feed as items sell — with auto-refreshing stats and a buyer leaderboard.
Compare up to 20 of your past shows side-by-side. See which categories sold best in each show, average order value, sell-through rate, and revenue per hour — so you can double down on what works and stop guessing what to feature next time.
Automatically generate packing lists grouped by buyer with sequential numbering. See every item each buyer purchased, totals, and item counts — ready to pack and ship.
Print packing labels on thermal printers in four sizes — 2×1, 1×3, 2×3, or 4×6. Print one label per buyer, one label per item, or both, with sequential buyer numbers for fast post-show packing.
Sub-second push notifications as each item sells during your live show, delivered over a persistent WebSocket connection — not delayed by page refreshes. Hear a chime and see a toast with the buyer and price the moment the sale lands.
Connect eBay, Depop, and Whatnot from one dashboard. Listings sync, sales auto-import, quantities propagate, and oversell-prevention fan-out fires in real time. Etsy, Mercari, and Poshmark sellers get manual-action notifications since none of those marketplaces expose a usable delist API to third-party tools today.
Import weekly payout reports and sales history CSVs. Auto-match to inventory, track every transaction, and reconcile payouts automatically.
Revenue by show, category performance, sales channel breakdown, geographic analysis, and trend charts. See what's working and double down.
Track cost basis, sold price, and see real profit per item. Expense tracking, period locking, and profit breakdowns by show or category.
Generate and batch print QR code labels. Scan during shows for instant item lookup — find storage location, price, and details in seconds.
Drill into every buyer’s full purchase history with you — what they’ve bought, how often, total spend, category preferences, and last-seen date. Spot repeat customers and tailor your show themes to your audience.
Rank your entire audience by predicted lifetime value. Identify VIP buyers before your competitors do, prioritise retention efforts on your highest-value customers, and quantify the long-tail revenue your community is worth.
See exact fee breakdowns — platform commission, processing fees, tips, refunds, shipping charges — with automatic transaction matching.
Monitor competitor eBay listings. Get alerts on price changes and track items you want to buy or compare pricing against.
Generate Profit & Loss statements, Schedule C reports with automated IRS line mapping, and state-level tax breakdowns. Tax season made simple for resellers.
Choose your inventory method — cash basis recognizes costs at purchase, accrual at sale. See accurate COGS, inventory valuation, and margins your way.
No spreadsheets. No manual entry. Just your real numbers.
Sign up free in seconds. No credit card required to start.
Import items via CSV and connect your marketplaces.
Upload Whatnot payouts and sync sales from eBay. More marketplaces coming soon.
See real profit, generate tax reports, and scale your reselling business.
Start free. Upgrade when you need more.
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Common questions from resellers.
The moment an item sells on any connected marketplace, SellDeck receives a webhook (or detects the sale via API for marketplaces without webhooks). Within seconds, queued jobs end the eBay listing and mark the Depop listing as sold — in parallel. Etsy and Mercari sellers get a push notification because neither marketplace exposes a usable delist API to third-party tools today. Result: no double sales, no suspended accounts, no angry buyers.
Vendoo's auto-delist is a BETA feature that polls your marketplaces every 10 minutes and requires your computer to be on and connected. SellDeck uses real-time webhooks running server-side — sub-minute response, no PC required, production-ready, with an audit trail of every delist action. We also lock cross-listings during your Whatnot live shows, which Vendoo can't do at all.
SellDeck detects double-sales within seconds and files an incident in your Oversell Recovery Inbox. From there you get one-click actions: cancel the eBay order with the buyer notified automatically, mark a manual refund issued, or send a buyer message. Every incident is timestamped and audit-trailed for your records — turning a potential account-suspending mistake into a 60-second fix.
SellDeck is reseller software that helps you prevent cross-listing oversells, track sales, manage inventory, calculate profit after fees, and generate tax reports — across Whatnot, eBay, and Depop. Replace your spreadsheets and unreliable polling-based tools with real-time, webhook-driven automation built for serious sellers.
SellDeck integrates with Whatnot (payout imports and browser-extension sync), eBay (listings, sold comps, watch tracking, real-time order webhooks), and Depop (listing sync + recreate-on-resume). Etsy, Mercari, and Poshmark sellers get manual-action notifications because none of those marketplaces expose a usable delist API to third-party tools today.
Etsy's API approval policy currently restricts third-party cross-listing tools as a category, regardless of size or quality. SellDeck applied for production API access and was declined with no appeal channel. We’ve kept the full Etsy integration code in place and continue to build relationships with Etsy’s partnership team in case the policy evolves. If you’re an experienced Etsy seller and need Etsy auto-sync today, you can connect SellDeck using your own Etsy developer keystring — Etsy approves individual-seller apps under their owner’s account. Email support and we’ll walk you through it. Otherwise, SellDeck still helps Etsy sellers with inventory tracking, P&L reports, AI pricing, and Whatnot show prep — just without auto-delist on the Etsy side.
Yes. Pro plans get Profit & Loss reports. Business plans add IRS Schedule C reports with automated line mapping and state-level tax breakdowns showing sales and tax collected by state — everything your accountant needs.
Cash basis counts costs when you buy items. Accrual counts costs when you sell them. SellDeck lets you choose your method and automatically calculates COGS and inventory valuation accordingly — important for accurate tax reporting.
Yes. The free plan includes up to 25 inventory items, 2 shows per month, and basic inventory management. Upgrade to Starter ($8.99/mo), Pro ($14.99/mo), or Business ($24.99/mo) when you need more — or save 17% with annual billing.
Lock your cross-listings, run the show, restore unsold items in one click, and know your real profit by morning — free to start, no credit card required.
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