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For sellers

Is this buyer legit?

Paste what the buyer sent you. We look for the scripts fake buyers use on Facebook Marketplace, Craigslist, OfferUp and similar apps.

This check runs in your browser. Nothing you paste is sent to ContactCheckup.

Common fake buyer scams

  1. 1Verification code scamThe buyer asks you to “prove you’re real” by reading back a code sent to your phone. The code sets up a Google Voice number or unlocks an account in your name.
  2. 2Fake payment emailThey ask for your email, then send a fake Zelle, Venmo or PayPal notice saying the money is on hold until you pay something.
  3. 3OverpaymentThey “accidentally” send too much by check or app and ask you to refund the difference. The original payment bounces or never existed.
  4. 4Courier or mover pickupThey’re away or buying a gift, so a mover or shipping agent will collect the item, usually after a fake payment.

Rules that stop almost every seller scam

  • Only trust money you can see in your balance after opening the app or bank yourself.
  • Never send money, gift cards or codes to a buyer, for any reason.
  • Never share a verification code, even to “prove you’re real.”
  • Don’t ship or hand over the item until the payment has fully cleared.
  • Keep the conversation inside the marketplace app.
  • For local sales, meet in public and prefer cash.

Questions

Is it a red flag if a buyer wants my phone number or email?

Often. Your email is used to send fake payment notices and your number for code scams. Keep the chat in the marketplace app.

A buyer wants to send someone to pick up the item. Is that a scam?

Not always, but a pickup by a mover, courier or relative combined with an app or check payment is a common scam pattern. Only release the item once the money is in your balance, or take cash in person.

What’s the safest way to sell locally?

Meet in a public place, take cash or a payment you can see land in your balance, and never share codes or send money to a buyer.

Is what I paste sent anywhere?

No. This checker runs entirely in your browser.

Also try the fake payment email checker, or see all seller tools.