The term "spot balance" usually refers to the amount of a particular asset that a trader or investor holds in their account for immediate use or trading. In other words, it is the current amount of an asset that a person has available for immediate settlement or delivery, as opposed to assets that are held in other types of accounts, such as savings accounts or retirement accounts.

For example, in the context of cryptocurrency trading, a spot balance would be the amount of a particular cryptocurrency that a trader holds in their exchange account and that is available for immediate trading or withdrawal. Similarly, in the context of stock trading, a spot balance would be the amount of a particular stock that a trader holds in their brokerage account and that is available for immediate sale or transfer.

Spot balances can be important to track, especially for active traders who are buying and selling assets frequently. By monitoring their spot balances, traders can quickly assess their liquidity and make informed decisions about which assets to buy or sell next. Spot balances can also be used to calculate gains and losses on trades, as well as to determine the overall value of a trader's portfolio.