# Stake & Unstake

### STAKE

<div data-with-frame="true"><figure><img src="/files/W4F4mO26v4j8ZL1wih5r" alt=""><figcaption></figcaption></figure></div>

#### **How staking works**

You deposit SUI. The protocol calculates how much stSUI to mint based on the current exchange rate.

```
stSUI minted = SUI deposited × (total stSUI / total SUI in pool)
```

At launch, the ratio is 1:1. After rewards accrue, you get slightly less than 1 stSUI per SUI — because each stSUI is now worth more.

#### **The exchange rate**

```
exchange_rate = total SUI in pool / total stSUI supply
```

At launch: 1 stSUI = 1 SUI.

After a year of rewards: 1 stSUI ≈ 1.03 SUI (depending on network APR).

Your stSUI count stays the same after staking. Its value in SUI grows.

#### **Stake Flow**

1. Connect your Sui wallet at [alphafi.xyz/stsui](https://alphafi.xyz/stsui).
2. Enter the amount of SUI to stake.
3. Review the exchange rate and expected stSUI.
4. Click **Stake** and sign.
5. stSUI lands in your wallet instantly. Rewards start accruing the next epoch.

### UNSTAKE

<div data-with-frame="true"><figure><img src="/files/prR8GQZ0SAwBLsAc1tV4" alt=""><figcaption></figcaption></figure></div>

#### **How instant unstaking works**

You return stSUI. The protocol calculates how much SUI to give back, sends it, and burns the stSUI:

```
SUI returned = stSUI returned × exchange_rate − redeem fee
```

The SUI comes from a liquidity buffer the protocol maintains, plus withdrawals from staked positions when needed. All in one transaction.

#### **Why no waiting period**

Normal Sui staking has a cooldown — usually one or more epochs. stSUI skips this by keeping a liquidity buffer and using Sui's native staking flows atomically.

The 0.01% redeem fee partly funds this.

#### **Unstake Flow**

1. Open [alphafi.xyz/stsui](https://alphafi.xyz/stsui).
2. Switch to the **Unstake** tab.
3. Enter the amount of stSUI.
4. Review the expected SUI received (after redeem fee).
5. Click **Unstake** and sign.
6. SUI arrives in the same transaction.

### Flash Staking

Flash staking is for developers building DeFi protocols.

**What is flash staking?**

A normal stake: deposit SUI → receive stSUI.

A flash stake reverses the order:

1. The protocol mints stSUI to the caller.
2. The caller uses the stSUI in the same transaction.
3. Before the transaction ends, the caller returns the equivalent SUI plus a flash stake fee.

If the SUI isn't returned, the whole transaction reverts. Nothing changes.

**Use cases**

* **Open an LP position in one transaction** without sourcing stSUI from the market first.
* **Atomic position switches** — swap a SUI position for a stSUI position in a single tx.
* **Yield strategies and aggregators** that compose stSUI minting into larger flows.

Most users won't touch flash staking. Regular stake and unstake cover normal use.


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