A fake buy order can be used to lure traders into buying at the top, and it is bad news for anyone who treats a big order on the book as proof of real demand.

• A huge buy order appears just under the current price, and everyone sees it as a floor.
• Traders buy ahead of that wall, pushing the price up on their own.
• The order is then canceled without ever filling anything — it only existed to be seen.
• The person behind it was likely selling into the rally the crowd created, leaving buyers stuck at the highs once the fake support disappears.

Outlook: Expect this pattern to keep catching traders who read order-book size as real buying, since the wall is designed to vanish before it ever trades.