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Deterministic fee calculator, net payout, and sudden-death auction floor tool for Whatnot sellers. Stop losing money on sudden-death Whatnot auctions. The Whatnot Profit & Margin Auditor gives live-stream sellers an instant, deterministic breakdown of true platform take-rates, exact net cash payouts, and minimum break-even starting bids before going live. Whatnot charges an 8% commission on items (5% for electronics, 4% for coins/bullion) PLUS a 2.9% + $0.30 payment processing fee on the entire gross transaction (including buyer shipping and estimated tax). For high-volume sellers running rapid 30-second auctions, small fee miscalculations quickly turn profitable inventory into net losses. KEY FEATURES: • Instant Whatnot Fee Breakdown: Accurately isolates category commission vs. payment processing charges across all standard rate tiers. • Net Cash Payout: Know your exact take-home deposit to the penny before listing. • Real Net Profit & Margin %: Factor in your unit cost basis to see true bottom-line profitability. • Sudden-Death Auction Floor: Calculates the exact minimum dollar starting bid required to guarantee you never sell at a loss on $1 or unreserved auctions. • Category Rate Presets: Supports Collectibles / Sports Cards / TCG (8%), Electronics (5%), and Coins & Bullion (4%). • 100% Client-Side & Private: Runs entirely inside your browser popup with zero external server tracking. HOW TO USE: 1. Click the extension icon in your Chrome toolbar. 2. Enter your Target Sale Price and Cost Basis. 3. Select your selling category. 4. Instantly view your Net Payout, Whatnot Fee Cut, and Minimum Safe Starting Bid. Built specifically for high-velocity Whatnot sellers, card breakers, vintage resellers, and live-stream auction hosts.