# Vaults

GUSD Feeder Pool Iron Bank (CREAM) Integration for mUSDVaults are used to earn rewards. Tokens such as imUSD or Feeder Pool tokens can be deposited to earn additional MTA rewards. On Ethereum mainnet two versions of these contracts are deployed. **BoostedSavingsVault** is used for single token rewards (MTA) and **BoostedDualVault** is used for 2 reward tokens. However, only one reward token can be used for the **BoostedDualVault** as well.  The *Boosted* in the name implies that this contract reacts to the staked MTA balance and receives a boost from that. 

Contracts are upgradable.

The following table lays out the currently deployed vaults and what contract is used.

{% tabs %}
{% tab title="Ethereum Mainnet" %}

| Vault                         | Contract                                                        |
| ----------------------------- | --------------------------------------------------------------- |
| imUSD Vault                   | [BoostedSavingsVault](/contracts/vaults/boostedsavingsvault.md) |
| imBTC Vault                   | [BoostedSavingsVault](/contracts/vaults/boostedsavingsvault.md) |
| mUSD/GUSD Feeder Pool Vault   | [BoostedSavingsVault](/contracts/vaults/boostedsavingsvault.md) |
| mUSD/BUSD Feeder Pool Vault   | [BoostedSavingsVault](/contracts/vaults/boostedsavingsvault.md) |
| mUSD/alUSD Feeder Pool Vault  | [BoostedDualVault](/contracts/vaults/boosteddualvault.md)       |
| mUSD/RAI Feeder Pool Vault    | [BoostedDualVault](/contracts/vaults/boosteddualvault.md)       |
| mUSD/FEI Feeder Pool Vault    | [BoostedDualVault](/contracts/vaults/boosteddualvault.md)       |
| mBTC/HBTC Feeder Pool Vault   | [BoostedSavingsVault](/contracts/vaults/boostedsavingsvault.md) |
| mBTC/TBTC Feeder Pool Vault   | [BoostedSavingsVault](/contracts/vaults/boostedsavingsvault.md) |
| mBTC/tBTCv2 Feeder Pool Vault | [BoostedDualVault](/contracts/vaults/boosteddualvault.md)       |
| {% endtab %}                  |                                                                 |

{% tab title="Ropsten Testnet" %}

| Contract      | Address                                    |
| ------------- | ------------------------------------------ |
| imUSD Vault   | 0xDEFc008BAC1e38F13F081DDD20acf89985DFa7C8 |
| imBTC Vault   | 0x7799BEEAf20120CC78f5cF2EB9C85e395B43bF4D |
| {% endtab %}  |                                            |
| {% endtabs %} |                                            |

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