What is Bid Ask Spread?
Crypto Glossary Definition
The difference between the price that a buyer will pay for an asset and a seller will sell that asset. A highly liquid market will have a very small spread.
Why Bid Ask Spread Matters
The bid-ask spread is the gap between the highest price a buyer will pay and the lowest price a seller will accept — a tight spread signals a liquid, efficient market, while a wide spread (common on obscure tokens) means buying and immediately selling back will cost you money even with no price movement at all.
Bid Ask Spread in Practice
A trader looking to buy a small-cap token opens the exchange's order book and notices the highest price any buyer is currently offering is meaningfully lower than the lowest price any seller will accept, a gap wide enough that buying and immediately reselling the same amount would result in an instant loss even if the token's price never moved at all. Curious how this compares to a more liquid asset, they check Bitcoin's order book on the same exchange and find the bid and ask prices differing by only a tiny fraction of a percent, an extremely tight spread reflecting deep liquidity and constant trading activity on both sides. Understanding the difference changes how the trader approaches the small-cap token: instead of placing a market order that would immediately cross the wide spread and pay a hidden cost, they place a limit order at a price between the bid and ask, willing to wait for a seller to meet them partway rather than paying the full spread upfront. Over time, they start checking the bid-ask spread as a quick liquidity gut-check before trading any unfamiliar token, treating a persistently wide spread as a warning sign about how costly it might be to exit the position later.
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