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In cryptocurrency trading, a “buy wall” is a massive buy order, or multiple buy orders, around a particular price level. Conversely, a “sell wall” is a significant accumulation of sell orders at a given price level.

Before understanding how buy and sell walls work, it is important to know what an order book and its market depth are.

BTC/USDT order book example. Source: Binance
BTC/USDT market depth chart. Source: Binance
Market depth chart illustrating buy and sell walls. Source: Phemex