> For the complete documentation index, see [llms.txt](https://docs.mellow.finance/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.mellow.finance/resources/mellow-lrt-depreciated/modules/delegatemodules/defaultbondmodule.md).

# DefaultBondModule

### Overview

`DefaultBondModule` contract handles deposits and withdrawals for bonds in the symbiotic module system.

### Key Features

* **Bond Deposits**: Facilitates deposits into bonds, managing token allowances securely.
* **Bond Withdrawals**: Enables secure withdrawals from bonds.
* **Allowance Management**: Uses `safeIncreaseAllowance` to ensure the appropriate token allowances are set.

### Methods

1. **Bond Deposit**
   * `deposit(address, uint256)`: Deposits tokens into a specified bond.
     * **bond**: The address of the bond.
     * **amount**: The amount of tokens to deposit.
     * **Returns**: The deposited amount.
     * **Errors**: Returns 0 if the amount is zero.
     * **Event**:
       * `DefaultBondModuleDeposit(address, uint256, uint256)`: Emitted after a successful deposit.
         * **bond**: Address of the bond.
         * **amount**: Amount deposited.
         * **timestamp**: Timestamp of the deposit.
2. **Bond Withdrawal**
   * `withdraw(address, uint256)`: Withdraws tokens from a specified bond.
     * **bond**: The address of the bond.
     * **amount**: The amount of tokens to withdraw.
     * **Returns**: The amount withdrawn.
     * **Errors**:
       * Returns 0 if the amount is zero or the bond balance is insufficient.
     * **Event**:
       * `DefaultBondModuleWithdraw(address, uint256)`: Emitted after a successful withdrawal.
         * **bond**: Address of the bond.
         * **amount**: Amount withdrawn.


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