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Depositing assets increases your available trading balance. Placing an order or providing passive liquidity commits some of that balance until the action is completed or unwound.

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What an order reserves

A sell order reserves the asset being sold. A buy order reserves the payment asset and the maker-fee allowance needed if it fills. The reservation prevents the same funds from backing multiple orders. It does not mean the trade has already happened.

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A partial-fill example

Suppose you deposit 1,000 USDC and place a resting order to buy 0.2 WETH at 2,500 USDC. For this example, assume no fees. With fees, the reservation and final balance also reflect the applicable charge. See Fees.

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Passive liquidity is separate

Providing passive liquidity moves assets out of available balance into a position. That inventory is not an open-order reservation. It can change composition as traders buy and sell against the position. A balance display that adds only available and reserved funds does not include passive-position inventory. Index passive-band events separately when reconciling market-wide liquidity. For integration details, use Accounts and Funding and the balance API.