Free Browser Extension

Know who to trust
before you buy

BreakCheck injects Trust Scores, cert badges, and scam alerts directly on Whatnot, eBay, and TikTok Shop — right next to the seller's name.

BC 87 /100 142 reviews ✓ Cert

BC 52 /100 23 reviews

BC 31 /100 8 reviews ⚠ 2 alerts

Add to Chrome — Free Sideload now (dev mode)

Chrome Web Store submission in review · Firefox AMO coming soon

Works where collectors shop

🔴

Whatnot

Badge on live stream pages, seller profile pages, and category cards.

✓ whatnot.com/live/*
✓ whatnot.com/user/*

🟡

eBay

Badge below the Seller Information block on Trading Cards item pages only.

✓ ebay.com/itm/*
✓ Cards/TCG categories

⬛

TikTok Shop

Lightweight badge on sports card seller pages and product listings.

✓ tiktok.com/@seller
✓ Card/collectibles pages

What the badge tells you

Trust Score (0–100)

Green ≥75 · Yellow 45–74 · Red <45 · Gray = no score

✓

BreakCheck Certified

Seller passed identity + ethics verification. Gold-standard status.

⚠

Scam Alert Count

Number of verified community scam reports against this seller.

Review Count

Total published reviews from verified buyers. Click to read them.

Install now (Developer Mode)

While the Chrome Web Store review is pending, install the extension directly in under 60 seconds.

Download the extension files

Clone or download the BreakCheck repo, then locate the extension/ folder.

Open Chrome Extensions

Navigate to chrome://extensions and toggle Developer mode in the top-right corner.

Load Unpacked

Click Load unpacked and select the extension/ folder. The BreakCheck icon will appear in your toolbar.

Browse to Whatnot, eBay, or TikTok Shop

Open any seller or listing page. The BreakCheck badge appears automatically next to the seller name.

Protect yourself before every break

Free. No account required. No personal data collected.

Add to Chrome — Free

Know who to trust before you buy