How to use My Deal Verifier on eBay and Buyee (and why every reseller should)

My Deal Verifier is a free Chrome extension that puts a deal verdict on every listing you browse. It works on eBay US, Mercari US, and Buyee.jp — and if you’re sourcing anywhere near those three sites, it’ll save you more time in the first hour than it takes to install.

This guide walks you through every supported surface, shows what each verdict means, and explains when you should trust it vs. double-check manually.

Install (90 seconds)

1. Go to the My Deal Verifier page on the Chrome Web Store and click Add to Chrome.
2. Pin the extension to your toolbar so you can toggle modes from the popup.
3. Click the icon — a small settings panel opens. Pick Buyer mode (am I getting a deal?) or Reseller mode (will I profit flipping this?). You can toggle any time without reloading.
4. That’s it. No account, no signup, no credit card. The free tier works forever.

Buyer mode vs Reseller mode — which to pick

The extension does two completely different calculations depending on mode:

• Buyer mode compares the listing price to the market median (what the item actually sold for on eBay in the last 90 days). You get verdicts like Great Deal (save 30%+), Good Deal (save 10%+), Fair, High, or Overpriced.
• Reseller mode asks a harder question: if you bought this listing and flipped it on eBay, would you actually make money after fees and shipping? You get Good Buy, Borderline, or Pass, with exact net profit and ROI numbers.

If you’re shopping for yourself, use Buyer mode. If you’re sourcing inventory, use Reseller mode. They use the same comp data but ask different questions.

On eBay search results pages

Run any eBay search — for example, seiko watch. As soon as the page loads, you’ll see a color-coded pill in the top-left corner of every tile:

• 💎 GREAT — listing is 30%+ below median sold price
• 🟢 GOOD — 10–30% below
• ⚪ FAIR — within ±5% of median
• 🟡 HIGH — 5–20% above
• 🔴 OVER — more than 20% above

Next to each pill, you’ll see the dollar savings (Save $124 · 62%) or how much you’d be overpaying (+$47 · 23% high). Scroll normally — badges appear in batches as you go, so a 60-tile page stays fast.

Pro tip: sort by “Newly Listed” and watch the GREAT Deal pills flash by. That’s live sourcing.

On an eBay item page

Click any listing. A floating panel appears in the top-right corner showing:

• Both Buyer and Reseller verdicts side-by-side
• Japan price / Mercari price / eBay price (whichever applies)
• Median sold — the number the verdict is computed against
• Net profit — what you’d pocket after 13% eBay fees
• ROI — profit divided by buy cost
• Show comps — click to reveal the exact listings that drove the median, sorted by price. Every verdict is auditable.

You can drag the panel by its header if it’s covering something, or click the ✕ to hide it on that page.

On Buyee Mercari Japan search

Buyee is where the extension really earns its keep. Japanese listings are priced in yen and the sticker price lies — what matters is the landed cost in USD once you add:

1. Buyee’s 5% service fee
2. JP domestic shipping to the Buyee warehouse
3. International shipping to the US
4. The current Japan DDP tariff (varies by category, automatically applied)

My Deal Verifier does all four calculations automatically for every tile. Instead of seeing “¥3,800” and guessing, you see the true landed cost in dollars, the verdict, and the profit math all in the same pill. This is the single biggest workflow improvement for US resellers sourcing from Japan.

Works on all three Buyee surfaces:

• Buyee Mercari Japan — buyee.jp/mercari/search
• Buyee JDirectItems Auction (Yahoo Auctions) — buyee.jp/item/search
• Buyee PayPay Fleamarket — buyee.jp/paypayfleamarket/search

On a Buyee item page

Same floating panel as eBay, but with three extra fields:

• Japan price (¥) — the raw yen price shown on Buyee
• Landed cost (US$) — what you’ll actually pay, including all fees + forwarding + tariff
• Bundle of 3 / Bundle of 5 — Buyee consolidation is free, so bundling items dramatically cuts per-item shipping. The extension shows you what 3-item or 5-item bundle pricing would be so you know whether to wait for more finds before pulling the trigger.

For auctions, you also get a 24-hour time-scaled buy-cost buffer. The closer to auction end, the tighter the buffer — so last-minute bids reflect what you can actually pay.

Why every reseller should use it

Three reasons:

1. It’s free forever. The Free tier is not a trial — it’s the permanent default. You only upgrade to Pro if you want the other three extensions in the mydealHQ toolkit (Bundle Risk Checker, Shipping Trap Checker, Bulk Supplier Scanner).
2. It saves ~15 seconds per listing. If you check 100 listings a day, that’s 25 minutes of sourcing time you get back every day. A working reseller nets that within the first week.
3. It tells you the truth. Every verdict is based on real eBay sold data, not a competitor scraper or affiliate algorithm. The only bias is eBay’s own recent sales.

The extension is the tool I wish I’d had when I started reselling. Built by a working reseller, for working resellers.

Install My Deal Verifier free →

Next up: a deep dive on what Buyee is, why you’d buy from it, and the perks that make it worth the service fee.