> 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
Guide to sfastUSD on Sei
## 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.
* 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.
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).
* Approve the transaction.
3. **Stake fastUSD for sfastUSD.**
* Navigate to the [Elixir page](https://www.elixir.xyz/fastusd-staking).
* Click on "Stake fastUSD."
* Confirm the transaction.
***
## 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.
**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.
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".
* Start the unstake process (Elixir has a 7-day cooldown period).
* 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.
* Review and confirm the transaction.
3. **Swap out of deUSD.**
* Swap to any other asset.
* or Unstake deUSD. (Elixir has a 7-day cooldown period)
{% 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 %}
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