> 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/tvlmodules/defaultbondtvlmodule.md).

# DefaultBondTvlModule

### Overview

`DefaultBondTvlModule` contract computes the total value locked (TVL) for bond-based assets in a vault.

### Key Features

* **Parameter Management**: Allows the configuration of bonds associated with a vault.
* **TVL Calculation**: Computes the TVL for each bond in the vault, returning detailed data structures.
* **Access Control**: Ensures only authorized admins can modify bond parameters.

### Methods

1. **Parameter Management**
   * `setParams(address, address[])`: Sets bond parameters for a given vault.
     * **vault**: Address of the vault.
     * **bonds**: An array of bond addresses to associate with the vault.
     * **Event**:
       * `DefaultBondTvlModuleSetParams(address, address[])`: Emitted after bond parameters are set for a vault.
         * **vault**: Address of the vault.
         * **bonds**: Array of bond addresses.
2. **TVL Calculation**
   * `tvl(address)`: Computes the total value locked for all bonds in the vault.
     * **vault**: Address of the vault.
     * **Returns**: An array of `Data` structures with the following details:
       * **token**: Address of the bond.
       * **underlyingToken**: Address of the asset used by the bond.
       * **amount**: Balance of the bond in the vault.
       * **underlyingAmount**: Identical to `amount`.


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