"Not enough liquidity" on Coinbase means there isn’t sufficient trading volume or available orders in the order book to execute your trade at the desired price or size. This typically happens when:

Low Trading Volume – The asset you're trying to buy or sell has few active buyers or sellers at the moment.
Large Order Size – If your order is too big relative to the available liquidity, Coinbase can’t fill it without significant price slippage.
Market Volatility – During extreme price swings, liquidity can dry up as traders pull orders.
New or Unpopular Pairs – Less-traded cryptocurrencies or trading pairs often have thinner order books.
How to Fix It:
Reduce Order Size – Try splitting your trade into smaller chunks.
Use a Limit Order – Instead of a market order, set a limit order near the current price.
Switch Pairs – Trade a more liquid pair (e.g., BTC/USD instead of a low-cap altcoin).
Wait for Better Conditions – Liquidity can improve during peak trading hours.
