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

# Asset Guide – sfastUSD

## What is sfastUSD?

sfastUSD is a staked version of fastUSD, created through the [Elixir platform](https://www.elixir.xyz/fastusd-staking). It allows users to earn rewards while maintaining liquidity on the Sei network, and can be used across DeFi protocols like Yei Finance.

### Where do I get sfastUSD?

You can get sfastUSD from:

* Swapping SEI or USDC for fastUSD and staking it on Elixir.
* Bridging deUSD from Ethereum via Elixir and staking it to receive sfastUSD.

***

{% hint style="info" %}
The following methods are available as of Apr 27, 2025.
{% endhint %}

## Get sfastUSD on Sei

### Method 1: Swap for sfastUSD on Sei

1. **Swap vis Symphony.**

   * Navigate to [Symphony](https://symph.ag/?tokenIn=0x3894085ef7ff0f0aedf52e2a2704928d1ec074f1\&tokenOut=0x160345fc359604fc6e70e3c5facbde5f7a9342d8).
   * Swap any asset for sfastUSD.

   <figure><img src="/files/XjaspYAqUIr3ICu3WquN" alt="" width="563"><figcaption></figcaption></figure>

   * Approve the transaction.

### Method 2: Get deUSD on Elixir and bridge to Sei

1. **Get deUSD on Elixir.**

   * Visit the [Elixir platform](https://www.elixir.xyz/deusd/staking/ethereum).
   * Swap USDC for deUSD.

   <figure><img src="/files/YieSiQu0Sr3xIsYKXlcD" alt="" width="563"><figcaption></figcaption></figure>
2. **Bridge to Sei.**

   * Navigate to the [Elixir Bridge](https://bridge.elixir.xyz/) page.
   * Choose deUSD and bridge it to Sei (it becomes fastUSD on Sei).

   <figure><img src="/files/r5epMlNDwuocsx9mJtxx" alt="" width="496"><figcaption></figcaption></figure>

   * Approve the transaction.
3. **Stake fastUSD for sfastUSD.**

   * Navigate to the [Elixir page](https://www.elixir.xyz/fastusd-staking).
   * Click on "Stake fastUSD."

   <figure><img src="/files/X6S9dm3yVqHjsA0LEU4h" alt="" width="563"><figcaption></figcaption></figure>

   * Confirm the transaction.

<figure><img src="/files/1TS5RYSfvyRZJvJ6fB1m" alt="" width="502"><figcaption></figcaption></figure>

***

## Supply sfastUSD on Yei

1. **Deposit sfastUSD.**
   * Navigate to the [Yei Finance page](https://app.yei.finance/).
   * Locate sfastUSD and click "Supply."
   * Enter the amount and confirm the transaction.

<figure><img src="/files/AOJZjA6NBVXmmxNciHoV" alt="" width="460"><figcaption></figcaption></figure>

**That’s it! 🎉** You are now utilizing your sfastUSD to earn rewards and Yei points.

***

## Bridge sfastUSD out of Sei

### Method 1: Swap sfastUSD for other assets on Sei

1. **Swap out of sfastUSD.**

   * Navigate to [Symphony](https://symph.ag/?tokenIn=0x0\&tokenOut=0x5cf6826140c1c56ff49c808a1a75407cd1df9423).
   * Swap sfastUSD for any other asset.

   <figure><img src="/files/WbgBvBkVewLpcbdVjrG0" alt="" width="563"><figcaption></figcaption></figure>
2. **Transfer out of Sei.**
   * Transfer the asset to a CEX or bridge out via [Yei Bridge](https://app.yei.finance/bridge/).

### Method 2: Unstake sfastUSD on Elixir and bridge out of Sei

1. **Unstake sfastUSD back to fastUSD.**

   * Navigate to the [Elixir Staking](https://www.elixir.xyz/fastusd-staking) page.
   * Click on "Manage Staked FastUSD".

   <figure><img src="/files/JmaDePcAJlsvLI6RIWA4" alt="" width="521"><figcaption></figcaption></figure>

   * Start the unstake process (Elixir has a 7-day cooldown period).

   <figure><img src="/files/iPN9huPgX243v05p0rMa" alt="" width="441"><figcaption></figcaption></figure>

   * Confirm the transaction and check the unstaking end date.
2. **Bridge fastUSD out of Sei.**

   * Visit the [Elixir Bridge](https://bridge.elixir.xyz/) page.
   * Select Sei as the source chain and choose your destination chain.

   <figure><img src="/files/LGV3jDHYaiu3OLP8ED7g" alt="" width="459"><figcaption></figcaption></figure>

   * Review and confirm the transaction.
3. **Swap out of deUSD.**

   * Swap to any other asset.

   <figure><img src="/files/vB5NYseMpZdXiVnrEdzC" alt="" width="422"><figcaption></figcaption></figure>

   * or Unstake deUSD. (Elixir has a 7-day cooldown period)

   <figure><img src="/files/CwpUACSCe9pX0sZsNalR" alt="" width="449"><figcaption></figcaption></figure>

{% hint style="info" %}
large transfers, start with a small test transaction to ensure a smooth process. Once comfortable, gradually increase the amount. Performing multiple test transactions is recommended to understand how the bridge operates.
{% endhint %}