Police are hunting an alleged Trade Me scam artist they believe has stolen $30,000 from users.
They say Joshua Calthorpe doesn't have his own account, but targets people who've left their contact details in the question and answer section of auctions.
He then texts or emails them posing to be the seller from the auction and offers them a deal they can't refuse provided it's done outside of TradeMe so they avoid the site's fees.
Trade Me head of Trust and Safety, Jon Duffy, says Mr Calthorpe is known to them.
"Over the history of this particular offender's offending on the site we've had around 45 victims. That stands from about 2009 to the present."