What is Sell Wall
Sell walls are generated when big investors who have a large reserve of a certain asset, referred to as whales, place a large limit sell order on the order book of an exchange at a certain price. It could also happen when a large group of investors place a great number of sell orders at a specific price. A sell wall can used by whales as a technique to manipulate an asset’s market price.
The objective of setting a sell wall could be to stir up fear in other investors or to drive them to sell their assets at prices lower than the sell wall, possibly driving the asset's price down.
Depth charts provided by exchange platforms can be employed to spot sell walls.