Marketplace Guardian

About

Buying or selling on Facebook Marketplace, Craigslist, or OfferUp? Marketplace Guardian helps you stay safe and save time — completely free, no account needed.

🛡️ SCAM CHECK
Highlight any listing or message and right-click "Check this for scams," or paste it into the popup. You get a clear risk score and the exact red flags — verification-code tricks, off-platform payment (Zelle / Cash App / wire / gift cards), fake shipping on a local pickup, deposit-to-hold scams, and more. It even weighs how long the seller has had their account and their star rating.

✍️ LISTING WRITER
Describe your item in a sentence and get a ready-to-post title, description, and a sensible suggested price.

🤝 NEGOTIATION HELPER
Get a polite, effective message that sticks to your budget — never an inflated number.

✅ Works on Facebook Marketplace, Craigslist, OfferUp and other local marketplaces
✅ Available in English and Spanish
✅ 100% free, no sign-up
✅ Private by design — nothing you check is stored

Marketplace Guardian is an independent tool and is not affiliated with, endorsed by, or sponsored by Facebook, Meta, Craigslist, or OfferUp.