Your account clearly shows funds, but when you place an order it says "insufficient balance." This usually has nothing to do with fee reserve. Instead, your "available balance" is locked by something else. First, understand the two types of assets in your account.
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Step 1: Know the difference between "available" and "in use"
Your OKX spot account has two balances: available balance (what you can use) and frozen balance (temporarily locked). Common reasons funds are frozen include:
You have an open order: if you placed a buy order that has not filled, that money is locked.
You have a leveraged position: margin is occupied.
Funds are in your funding account or derivatives account, not transferred to your spot account.
The fix is to go to the "Assets" page, tap the specific coin, and check the "Available balance." If an open order is holding funds, cancel the order first. If you are using leverage, close the position or transfer funds.
Where trading fees are deducted
Trading fees are not "an extra cash amount taken from your available balance." Instead, after your trade fills, they are deducted directly from the coins you buy.
For example: you place a market order to buy 1 BTC at 20,000 USDT, and the taker fee rate is 0.1%. The system deducts 0.001 BTC (about 20 USDT) from the 1 BTC you receive as the fee, so you actually get 0.999 BTC. Before placing the order, you do not need extra USDT in your account to cover this fee.
So if "insufficient balance" is caused by fees, it only happens when your available balance is already equal to the order amount before placing the order, and after the trade fills there is not enough available balance left when the system deducts the fee.
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How to check before you operate
Go to the "Assets" page and check the "Available balance" of that coin. If it is lower than the amount you need, first check whether an open order is locking your balance. Cancel the order or wait for it to fill, then try again. Also confirm whether funds are in your funding account or derivatives account. If they are, transfer them to your spot account first before placing an order.
