What is Shill Bidding?
What Is Shill Bidding on eBay?
Shill bidding is a form of auction fraud where a seller artificially increases the price of an item by placing bids on their own auction, either through a second account or with the help of another person. The aim is to drive up the final selling price, forcing genuine buyers to pay more than they originally intended.
Although shill bidding can occur on any online auction platform, it is most commonly associated with eBay because it is relatively easy for a seller to create an additional account or arrange for someone else to place bids on their behalf. This practice is particularly tempting for sellers who start their auctions at a very low price in order to attract early interest and encourage competitive bidding.
In a typical shill bidding scenario, a genuine buyer places a bid on an item with a low starting price. The seller then uses another account to place a slightly higher bid, often by the minimum bid increment. The genuine bidder receives an outbid notification and may decide to bid again. This process can continue several times, gradually pushing the auction price higher until it reaches the amount the seller was hoping to achieve.
Some sellers use shill bidding as an alternative to setting a reserve price. While eBay allows sellers to set reserve prices, doing so may involve additional fees and can discourage some bidders. By artificially increasing bids through shill bidding, an unscrupulous seller attempts to achieve the same result without paying those fees.
However, shill bidding does not always work. Sometimes the seller’s secondary account ends up as the winning bidder. In these cases, the seller may cancel the transaction, offer the item to a lower bidder, or simply relist the item at a later date. Over the years, numerous sellers have been caught and prosecuted for engaging in shill bidding, demonstrating that online auction fraud can have serious legal consequences.
How to Avoid Shill Bidding
One of the best ways to reduce your risk of becoming a victim of shill bidding is to avoid placing bids too early in an auction. Early bidding gives dishonest sellers more time to monitor your activity and potentially manipulate the auction price.
Many experienced eBay users prefer to place their bids during the final moments of an auction, a strategy commonly known as “sniping.” By bidding late, you minimise the opportunity for a seller or accomplice to artificially increase the price. Auction sniping tools can automate this process by placing your maximum bid just seconds before the auction ends.
It is also worth reviewing a seller’s bidding history where available. Repeated bidding activity from the same accounts across a seller’s listings can sometimes be a warning sign. While this does not automatically prove wrongdoing, unusual bidding patterns should be treated with caution.
Is Shill Bidding Illegal?
Yes. Shill bidding is both against eBay’s rules and illegal in many countries. eBay actively monitors auctions for suspicious bidding activity and may suspend or permanently ban accounts found to be involved in shill bidding. In serious cases, legal action may also be taken against those responsible.
If you suspect a seller is engaging in shill bidding, you should report the listing to eBay so that it can be investigated. Protecting yourself from online auction scams starts with understanding how these schemes work and recognising the warning signs before placing a bid.
Copyright Garry King and Collector Approved 2026.
Garry King is a long time collector and owner of Autografica.co.uk and has has been a full time buyer and seller of signed memorabilia for over 35 years. He has written many articles on autographs and has appeared on many TV and radio programs in the UK and featured in numerous newspaper and magazine articles.