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Spot scams, write listings & negotiate on Facebook Marketplace, Craigslist & more. Free, no sign-up. English & Spanish. 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.