The bid is live.
Now you know what it's worth.

Slabscout is a free Chrome extension for Whatnot card breaks. A card comes up, you press one key, and a small panel tells you what the card is, what it sells for, and whether the current bid is getting away from reality. Takes a couple seconds. You bid or you don't.

Add to Chrome — free How it works Free. No account. Runs on your own free Google AI key.
A real scan, on a real stream
Live Whatnot card break
LIVE604
Item on Screen #32$12 · 9 bids
Michael Jordan
1990 SkyBox #41 ✓ verified
PSA 9 ✕
$59.72
Market value · PSA 9 · 7,358 sales/yr
Live bid $12below value −80%
Raw $4.88 PSA 10 $800
Raw $4.88PSA 9PSA 10 $800
Comps Match Cards3 Parallels2
Your scan from the streamYour scan
Matched catalog cardSCP catalog
✓ Player✓ Year ✓ Set✓ #41✓ Visual 8/8
eBay live · asks ≠ soldsVerify on eBay →
The problem

Ten-second auctions. Thirty-second research.

You know the drill. Card comes up, chat's moving, and you've got one thumb on eBay trying to type "2023 select wembanyama" before the gavel. Half the time the results are the wrong card anyway. By the time you trust a number, someone else owns the card. Slabscout does that whole lookup in one keypress, on top of the stream.

It gets the card right

The panel doesn't just guess from a blurry frame. It reads the card, checks the number against real checklists, and compares against photos of matching listings. When it's sure, it says verified. When it's not, it says so — and shows you the closest candidates so you can tap the right one.

Real values, not wishful asks

The big number is built from actual sold prices, per grade — raw, PSA 9, PSA 10. Next to it: what sellers are asking and what buyers recently paid, side by side. Asks run high. The panel says that out loud instead of pretending an ask is a value.

It watches the bid

Slabscout reads the current bid off the stream and compares it against value in real time. "Over value +147%" in amber means let it go. Green means the room's asleep and you might be about to steal one.

How it works

Three steps, and two of them are setup.

Install it

Add Slabscout to Chrome. No account. Nothing to pay us, now or later.

Paste one key

Card reading runs on Google's free AI tier. Grab a key (takes a minute, no card needed), paste it into settings once, done. It stays in your browser.

Press S

On any Whatnot stream, when a card's on screen, hit S. That's the whole workflow.

Install

Get Slabscout

Chrome Web Store listing is in review. Until it clears, installing by hand takes about a minute:

Manual install (Chrome / Edge / Brave)
1. Download the extension ZIP and unzip it anywhere.
2. Go to chrome://extensions and turn on Developer mode (top right).
3. Click Load unpacked, pick the unzipped extension folder.
4. Open Settings from the extension, paste your key, go scan something.
FAQ

Things people ask

What's the catch? Why free?
No catch. There's no account and no way to pay us. The AI runs on your own free Google key, and the pricing data comes from sources we already license. If that changes someday, it'll be opt-in, not a surprise.
Are the prices always right?
No, and don't trust any tool that claims otherwise. What Slabscout does instead is show its work: where the value comes from, how many sales back it up, and links to check everything on eBay in one click. When its own sources disagree, it flags that instead of picking a number and acting confident.
What leaves my browser?
Only when you press scan: the video frame goes to Google's AI with your key to read the card, and the card's name goes to our pricing server. That's it. No browsing history, no account, no trackers. Details in the privacy policy.
Does it handle slabs and parallels?
Yes. Slabs get grade-specific values. Parallels get their own prices — a Silver isn't priced like a base card, because it isn't one.
Is this a Whatnot thing?
No — it's an independent tool made by collectors. Not affiliated with Whatnot, eBay, or PSA.