> ## Documentation Index
> Fetch the complete documentation index at: https://docs.infinifi.xyz/llms.txt
> Use this file to discover all available pages before exploring further.

# StakedToken.sol

> siUSD - Staked position token

## StakedToken.sol (siUSD)

**Purpose:** Represents staked iUSD positions and provides exposure to liquid farm returns.

## Description

`StakedToken` (siUSD) is obtained by staking iUSD. It provides exposure to liquid returns from farms like AAVE and can be instantly converted back to iUSD.

## Key Features

* Represents liquid staking position
* Earns yields from liquid farms
* Instant unstaking to iUSD
* Yield distributed over 8-hour epochs (as of 2025-06-14 upgrade)

<Warning>
  As of the 2025-06-14 upgrade, siUSD is no longer ERC4626 compatible. Users must use the Gateway to stake and unstake.
</Warning>

## Contract Address

| Network | Address                                                                                                                  |
| ------- | ------------------------------------------------------------------------------------------------------------------------ |
| Mainnet | [`0xDBDC1Ef57537E34680B898E1FEBD3D68c7389bCB`](https://etherscan.io/address/0xDBDC1Ef57537E34680B898E1FEBD3D68c7389bCB)  |
| Plasma  | [`0xE335ABb943EcF2d7555D0f732ecC19Ce79C39aFD`](https://plasmascan.to/address/0xE335ABb943EcF2d7555D0f732ecC19Ce79C39aFD) |