Ethena sUSDe — Yield-Bearing Stablecoin

Interact with Ethena's sUSDe (staked USDe) protocol on Ethereum mainnet. sUSDe is an ERC-4626 vault token that earns yield from Ethena's delta-neutral strategy (~10% APY).

Pre-flight Checks

Run once per session:

1. Confirm installed: Run which plugin-store. If not found, install:

   curl -sSL https://raw.githubusercontent.com/purong-huang-1121/skills-store/main/install.sh | sh
   

2. Check for updates: Read ~/.plugin-store/last_check, skip if updated within 12 hours.

Authentication

• Read-only commands (apy, balance): No auth required.
• Write commands (stake, cooldown, unstake): Requires EVM_PRIVATE_KEY in .env (Ethereum mainnet wallet with ETH for gas).

Commands

View sUSDe Yield Info

plugin-store ethena apy

Returns: exchange rate (sUSDe → USDe), total assets, total supply, cooldown duration.

Example output:

{
  "ok": true,
  "data": {
    "exchange_rate": "1.223045",
    "total_assets_usde": "5234567890.123456",
    "total_supply_susde": "4280000000.000000",
    "cooldown_duration_seconds": 604800
  }
}

• exchange_rate: 1 sUSDe = X USDe (grows over time as yield accrues)
• cooldown_duration_seconds: 604800 = 7 days

Check Balances

plugin-store ethena balance <ADDRESS>

Returns USDe and sUSDe balances, plus sUSDe value in USDe terms.

Example output:

{
  "ok": true,
  "data": {
    "usde_balance": "1000.000000",
    "susde_balance": "500.000000",
    "susde_value_in_usde": "611.522500"
  }
}

Stake USDe → sUSDe

plugin-store ethena stake --amount <AMOUNT>

Deposits USDe into the sUSDe vault, receiving sUSDe shares. Requires ERC-20 approval (handled automatically).

• amount: Decimal string (e.g. "100.5")
• Gas: 150k gas on Ethereum mainnet ($2-5 at typical gas prices)

Initiate Unstake Cooldown

plugin-store ethena cooldown --amount <AMOUNT>

Starts the 7-day cooldown period. The amount is in USDe terms (how much USDe you want to receive). During cooldown, the sUSDe shares are locked but still earn yield until withdrawal.

Withdraw After Cooldown

plugin-store ethena unstake

Completes the withdrawal after the 7-day cooldown period has elapsed. Returns USDe to the wallet.

Contracts

Contract	Address	Network
sUSDe	0x9D39A5DE30e57443BfF2A8307A4256c8797A3497	Ethereum
USDe	0x4c9EDD5852cd905f086C759E8383e09bff1E68B3	Ethereum

Key Concepts

• ERC-4626 Vault: sUSDe is a standard tokenized vault. Deposit USDe, receive sUSDe shares. The exchange rate increases over time as yield accrues.
• Cooldown Period: 7 days. Must call cooldown first, wait 7 days, then call unstake. No partial withdrawals during cooldown.
• Yield Source: Ethena runs a delta-neutral strategy (spot ETH + short perp) and distributes funding rate income to sUSDe holders. APY is variable (~8-15% historically).
• sUSDe on L2: sUSDe is bridged to Arbitrum, Base, and other L2s. You can buy sUSDe directly on L2 DEXes (cheaper gas), but staking/unstaking only works on Ethereum mainnet.

Workflow Examples

Check if sUSDe yield is attractive

User: "sUSDe 现在收益多少"
→ plugin-store ethena apy
→ "sUSDe 当前兑换率 1.2230，年化约 10%。7 天冷却期。"

Stake USDe

User: "帮我质押 1000 USDe"
→ plugin-store ethena stake --amount 1000
→ "✅ 已质押 1000 USDe，获得 ~817.7 sUSDe"

Full unstake flow

User: "我要取出 sUSDe"
→ plugin-store ethena cooldown --amount 500
→ "已发起冷却，500 USDe 将在 7 天后可取出"
... 7 days later ...
User: "冷却到了吗"
→ plugin-store ethena unstake
→ "✅ 已取出 500 USDe 到钱包"