> For the complete documentation index, see [llms.txt](https://docs.oh.finance/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.oh.finance/protocol/oh-yield-index/oh-manager.md).

# Oh! Manager

The `OhManager` contract is the entry point for protocol investment control and revenue management. The Manager contains data about all on-chain Banks, Strategies, Liquidators, and whitelisted Smart Contracts.

Banks are managed by calling any of the following functions:

* `finance()` - Invest all available underlying in the next Strategy queued for the Bank
* `financeAll()` - Invest all available underlying on the Bank evenly across all Strategies
* `rebalance()` - Withdraw all underlying, then invest all available underlying on the Bank evenly across all Strategies

{% hint style="info" %}
Only EOAs (Externally Owned Addresses, i.e. end-users) and whitelisted Smart Contracts can call protocol management functions to prevent attacks
{% endhint %}

## Management Fee

Any user can call the above functions and be rewarded with **2%** of the total profit generated from the transaction, the `managementFee`.

## **Buyback & Burn**

The Manager accrues **20%** of total profit generated during Bank management as a fee to buyback & burn Oh! Tokens, the `buybackFee`. Any user can trigger the `buyback()` function to use accrued revenue to buyback & burn Oh! Tokens.


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