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Instant profit calculator, bid/ask spreads and market insights for sneaker resellers on StockX and GOAT. SneakerSpy - Price Analytics for StockX & GOAT Stop guessing your sneaker margins. Start knowing them. If you flip sneakers on StockX or GOAT, you already know the feeling. You see a shoe listed for $250, you buy it for $180, and you think you just made $70. Then the StockX transaction fees hit. Then the payment processing fee... That's the problem. The sneaker market moves fast. Your pricing and purchasing decisions shouldn't be based on mental math or messy spreadsheets. WHY FLIPPING SNEAKERS IS SO HARD The raw price on StockX or GOAT never tells the whole story. To figure out if a flip is actually worth your time, you have to: - Find the real lowest ask and highest bid - Calculate the spread - Subtract the platform's seller fees (which eat directly into your margin) - Deduct your own shipping costs - Account for your original cost (COGS) Most resellers do this in their heads or constantly switch tabs to a spreadsheet. By the time you figure out the exact net profit, the price has moved or someone else took the ask. SneakerSpy solves exactly this problem. It runs quietly on StockX and GOAT product pages to calculate your true take-home profit instantly. WHAT THIS EXTENSION DOES SneakerSpy is a lightweight, on-page analytics panel that injects real-time market data and profit calculations directly into StockX and GOAT listings. No more spreadsheets. No more blind bids. Here's what you get: PROFIT CALCULATOR — Instantly see your true net profit. It automatically detects the current listed price and subtracts default platform fees. MARKET DATA AT A GLANCE — See the lowest ask, highest bid, last sale, and the exact spread in one clean panel. Know instantly if a shoe is liquid or sitting. COGS & SHIPPING TRACKER — Input your cost of goods sold and expected shipping costs. The extension instantly updates your Net Profit, Margin percentage, and ROI. SEAMLESS UI — A clean, minimalist floating panel that doesn't block your view of the shoe. It looks and feels like it belongs on the site. HOW IT WORKS 1. Install the extension. 2. Browse to any sneaker product page on StockX.com or GOAT.com. 3. The SneakerSpy panel automatically appears on the side of your screen. 4. Enter your COGS (Cost of Goods Sold) and Shipping costs. 5. Instantly see your exact net profit, margin, and ROI. That's it. No complicated setup, just instant financial clarity for every shoe you view. WHY A FLOATING PANEL Most price check tools use annoying pop-ups that close when you click away, or they overwrite the page's original layout and break the site. SneakerSpy uses a sleek, floating panel that stays out of your way but remains visible while you scroll through sizes, past sales, and bids. You get the data you need without sacrificing the browsing experience. SAVED COSTS If you enter your COGS for a specific SKU, SneakerSpy saves it. When you return to that sneaker later to check how the market has moved, your original cost is already there, instantly showing your updated profit margins. All data is stored locally on your device. Nothing is sent to any server. REAL SCENARIOS WHERE THIS HELPS THE QUICK FLIP DECISION: You're browsing GOAT and see a recently dropped Jordan sitting at $220. Your local connect is selling it for $170. Is it a good flip? You open the page, enter $170 in COGS, and SneakerSpy instantly reveals that after 12.5% fees, you'd only make a few dollars. You skip the shoe and save your capital. COMPARING PLATFORMS: You have a pair of Yeezys to sell. You open the StockX page and the GOAT page side-by-side. SneakerSpy automatically pulls the Highest Bid on each platform, applies the respective seller fees, and shows you exactly which platform will put more actual cash in your bank account. INVENTORY VALUATION: You're holding 5 pairs of Dunks. The market is moving. You click on the StockX listing, SneakerSpy remembers your saved $110 COGS, and instantly shows your current ROI is sitting at 35%. You decide it's the perfect time to sell. WHAT THIS EXTENSION DOES NOT DO - It does not scrape your personal account data. - It does not place bids or asks on your behalf. - It does not track your browsing history outside of StockX and GOAT. The only permission it uses: - Storage — Used strictly to save your COGS inputs and panel screen position locally on your own machine. That's it. All calculations happen directly in your browser. FREE TIER SneakerSpy is free to use for casual sellers. The Free tier includes 10 full market analyses per day, which is more than enough for most independent resellers doing a few flips. If you are a high-volume seller analyzing hundreds of shoes, a PRO upgrade ($14.99/mo) is available for unlimited daily analyses. THE MATH BEHIND THE PROFIT We keep it transparent. Here is the formula running under the hood: Net Profit = (Sale Price) - (Platform Fees) - (Shipping) - (COGS) Margin = (Net Profit / Sale Price) * 100 ROI = (Net Profit / COGS) * 100 No hidden logic. No rounding tricks. Just accurate financial data. WHO THIS IS FOR - Part-time sneaker resellers looking to stop losing money on bad flips - High-volume StockX/GOAT power sellers who need to calculate margins at lightning speed - Sneaker collectors trying to evaluate the current cash value of their portfolio GETTING STARTED Click "Add to Chrome" and open a StockX or GOAT product page. You'll see your first profit calculation in less than 5 seconds. No account needed. No sign-up. Just smarter sneaker selling.