A buy wall is a disproportionately large buy limit order placed on a cryptocurrency exchange.
The exchange then helps buy and sell orders with matching prices to mutually execute — partially or in full depending on the number of coins listed in each of the orders.
In a way, it “blocks” the price of the asset from going below a certain threshold: there is no rational reason for sellers to offload their assets at a price lower than what the already existing unfulfilled buy wall offers to purchase at. Buy walls can be created for different purposes.
Another possible reason for placing a buy wall is price manipulation — a whale who holds a large amount of a certain cryptocurrency might be concerned with the public image of their asset. Consequently, they use their resources to simultaneously buy more coins and prop up the price, making the asset appear more healthy than it actually is.
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