# Buy / Stake

## Buying or Redeeming USDai

{% hint style="warning" %}
USDai does not accrue yield. Stake USDai to earn yield on deposits.
{% endhint %}

1. Select the [**BUY**](https://app.usd.ai/buy) tab in the transaction modal
2. Select the Currency and Network ($USDai for Redeem)
3. Enter the Amount
4. Review the Terms
5. Click `Approve` to allow the USDai contract to use your tokens
6. Click `Buy`

{% hint style="success" %}
USDai is 100% backed by yield bearing stablecoins, so it can always be instantly redeemed for any of the deposit currencies. 
{% endhint %}

***

## Staking your USDai

{% hint style="warning" %}
The USDai unstaking period is approximately 30 days.
{% endhint %}

1. Select the [**STAKE**](https://app.usd.ai/stake) tab in the transaction modal
2. Select the Amount of $USDai you want to stake
3. Review the Terms
4. Click `Approve` to allow the USDai contract to spend your $USDai
5. Click `Stake`

{% hint style="info" %}
USDai to sUSDai is not a 1:1 conversion as sUSDai is the yield-bearing token that passively earns income. When staking USDai, you will receive a lower amount of sUSDai and when unstaking sUSDai you should receive a higher amount of USDai.
{% endhint %}

## Unstaking your sUSDai

1. Select the [**UNSTAKE**](https://app.usd.ai/unstake) subtab within the **STAKE** tab in the transaction modal
2. Select the Amount of $sUSDai you want to unstake
3. Review the Terms
4. Click `Approve` to allow the USDai contract to spend your $sUSDai
5. Click `Unstake`
6. Go to Activity and click `Withdraw` USDai once the unstaking period ends

***

## Bridging your USDai or sUSDai

{% hint style="info" %}
USDai can be bridged to/from any chain

* Mint on Abritrum or Ethereum or any other EVM chain available in the future

sUSDai can be bridged to/from any chain

* Stake USDai for sUSDai on Arbitrum
* Mint on Ethereum or any other EVM chain available in the future
  {% endhint %}

1. Navigate to the [BRIDGE](https://app.usd.ai/bridge) page on the left sidebar
2. Select the token and network you want to bridge from
3. Select the Amount of USDai or sUSDai you want to bridge
4. Review the Terms

* Click `Approve` to allow the contract to spend your USDai or sUSDai
* Click `Bridge`


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