> ## Documentation Index
> Fetch the complete documentation index at: https://manuals.cobo.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Remaining balance after token sweeping

> Learn why a small balance may remain in a deposit address after auto token sweeping.

**Applicable to: Custodial Wallets (Web3 Wallets), MPC Wallets**

On some networks, after auto token sweeping, a small amount may remain in the deposit address. Common reasons include:

* Minimum balance requirements: Some chains (such as XRP) require a minimum reserve balance. For example, an XRP address must keep at least 1 XRP, so 1 XRP may remain after sweeping.
* L1 fee estimation differences for L2 sweeping: On L2 networks (such as Base), a sweep transaction includes L1 fees. Actual L1 fees may be lower than the estimated amount, leaving a remainder of `estimated L1 fee - actual L1 fee`.
* Gas estimation differences on EVM networks: On EVM-compatible chains (such as Ethereum and BSC), gas fees are calculated using a maximum estimate (Gas Limit). If the actual gas used is lower, `Gas Price * unused gas` may remain in the deposit address.