Stake ETH on StakeWise V3 and receive osETH (liquid staking token). Earn staking rewards while keeping your ETH liquid.

What This Skill Does

• Stake ETH → Receive osETH tokens (handles state updates automatically)
• Unstake ETH → Burn osETH for ETH
• Check staked position → View vault shares and earned rewards
• Monitor vault state → Check if keeper state update is required
• Query harvest proofs → Get Merkle proofs from subgraph for deposits

Required Credentials

Set these environment variables or edit the scripts:

export STAKEWISE_VAULT="0x8A93A876912c9F03F88Bc9114847cf5b63c89f56"
export KEEPER="0x6B5815467da09DaA7DC83Db21c9239d98Bb487b5"
export PRIVATE_KEY="your_private_key"
export MY_ADDRESS="your_address"
export RPC_URL="https://ethereum-rpc.publicnode.com"

Quick Start

# Stake 0.1 ETH (auto-handles state updates)
node scripts/stake.mjs 0.1
# Check staked position
node scripts/position.js
# Unstake 0.05 osETH
node scripts/unstake.js 0.05
# Check if state update required
node scripts/check-state.js

How StakeWise V3 Works

Architecture Overview

StakeWise V3 uses a keeper-oracle pattern for state updates:

User (EOA/UP)
    ↓
Vault Contract
    ↓
Keeper (Oracle) - Validates and processes rewards
    ↓
osETH Token - Liquid staking token

Key Components

The State Update Mechanism

Why state updates?

• StakeWise accumulates rewards off-chain via validators
• Keeper periodically "harvests" and posts state on-chain
• Users can only deposit when state is current

When is state update required?

const vault = new ethers.Contract(vaultAddress, vaultAbi, provider);
const needsUpdate = await vault.isStateUpdateRequired();
// true = must update state before depositing

Staking Flow (With State Update)

Step 1: Check State
    User
      ↓
    vault.isStateUpdateRequired()
      ↓
    Returns: true (update needed)
Step 2: Query Subgraph for Harvest Params
    User
      ↓
    POST to StakeWise subgraph
      ↓
    Returns: rewardsRoot, reward, unlockedMevReward, proof[]
Step 3: Update State and Deposit
    User
      ↓
    vault.updateStateAndDeposit(harvestParams, receiver, referrer)
      ↓
    Keeper validates harvest
      ↓
    Vault mints osETH to receiver
      ↓
    User receives osETH

Detailed Usage

Stake ETH (Full Flow with State Update)

import { ethers } from 'ethers';
import fetch from 'node-fetch';
// Setup
const provider = new ethers.JsonRpcProvider(process.env.RPC_URL);
const wallet = new ethers.Wallet(process.env.PRIVATE_KEY, provider);
// Vault ABI (minimal)
const VAULT_ABI = [
  'function isStateUpdateRequired() view returns (bool)',
  'function updateStateAndDeposit(tuple(bytes32 rewardsRoot, uint256 reward, uint256 unlockedMevReward, bytes32[] proof) harvestParams, address receiver, address referrer) external payable',
  'function deposit(address receiver, address referrer) external payable'
];
const vault = new ethers.Contract(
  process.env.STAKEWISE_VAULT,
  VAULT_ABI,
  wallet
);
// Amount to stake
const stakeAmount = ethers.parseEther('0.1'); // 0.1 ETH
// Step 1: Check if state update required
const needsUpdate = await vault.isStateUpdateRequired();
console.log('State update required:', needsUpdate);
if (needsUpdate) {
  // Step 2: Query subgraph for harvest params
  const subgraphQuery = {
    query: 
      query getHarvestProofs($vault: String!) {
        harvestProofs(
          where: { vault: $vault }
          orderBy: blockNumber
          orderDirection: desc
          first: 1
        ) {
          rewardsRoot
          reward
          unlockedMevReward
          proof
        }
      }
    ,
    variables: {
      vault: process.env.STAKEWISE_VAULT.toLowerCase()
    }
  };
  const response = await fetch('https://graphs.stakewise.io/mainnet-a/subgraphs/name/stakewise/prod', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(subgraphQuery)
  });
  const data = await response.json();
  const harvestProof = data.data.harvestProofs[0];
  // Step 3: Call updateStateAndDeposit
  const harvestParams = {
    rewardsRoot: harvestProof.rewardsRoot,
    reward: BigInt(harvestProof.reward),
    unlockedMevReward: BigInt(harvestProof.unlockedMevReward),
    proof: harvestProof.proof
  };
  const tx = await vault.updateStateAndDeposit(
    harvestParams,
    process.env.MY_ADDRESS,  // receiver
    ethers.ZeroAddress,       // referrer (optional)
    { value: stakeAmount }
  );
  const receipt = await tx.wait();
  console.log(Staked ${ethers.formatEther(stakeAmount)} ETH with state update);
  console.log(Transaction: ${receipt.hash});
} else {
  // Simple deposit (no state update needed)
  const tx = await vault.deposit(
    process.env.MY_ADDRESS,
    ethers.ZeroAddress,
    { value: stakeAmount }
  );
  const receipt = await tx.wait();
  console.log(Staked ${ethers.formatEther(stakeAmount)} ETH);
  console.log(Transaction: ${receipt.hash});
}

Check Staked Position

const OSETH_ABI = [
  'function balanceOf(address) view returns (uint256)',
  'function convertToAssets(uint256 shares) view returns (uint256)'
];
// Get osETH token address from vault
const osEthAddress = await vault.osToken();
const osEth = new ethers.Contract(osEthAddress, OSETH_ABI, provider);
const osEthBalance = await osEth.balanceOf(process.env.MY_ADDRESS);
const underlyingEth = await osEth.convertToAssets(osEthBalance);
console.log(osETH Balance: ${ethers.formatEther(osEthBalance)});
console.log(Equivalent ETH: ${ethers.formatEther(underlyingEth)});

Unstake ETH

const VAULT_FULL_ABI = [
  'function redeem(uint256 shares, address receiver, address owner) returns (uint256 assets)',
  'function maxRedeem(address owner) view returns (uint256)'
];
const vaultFull = new ethers.Contract(
  process.env.STAKEWISE_VAULT,
  VAULT_FULL_ABI,
  wallet
);
// Check max redeemable
const maxShares = await vaultFull.maxRedeem(process.env.MY_ADDRESS);
console.log(Max redeemable: ${ethers.formatEther(maxShares)} osETH);
// Redeem shares for ETH
const sharesToRedeem = ethers.parseEther('0.05');
const tx = await vaultFull.redeem(
  sharesToRedeem,
  process.env.MY_ADDRESS,  // receiver
  process.env.MY_ADDRESS   // owner
);
const receipt = await tx.wait();
console.log(Redeemed ${ethers.formatEther(sharesToRedeem)} osETH for ETH);
console.log(Transaction: ${receipt.hash});

Subgraph Queries

Get Latest Harvest Proof

const query = {
  query: 
    query {
      harvestProofs(
        orderBy: blockNumber
        orderDirection: desc
        first: 1
      ) {
        id
        vault
        rewardsRoot
        reward
        unlockedMevReward
        proof
        blockNumber
      }
    }
  
};
const response = await fetch('https://graphs.stakewise.io/mainnet-a/subgraphs/name/stakewise/prod', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify(query)
});
const data = await response.json();
console.log(data.data.harvestProofs[0]);

Get Vault State

const query = {
  query: 
    query {
      vaults(first: 1) {
        id
        address
        totalAssets
        totalShares
        apr
      }
    }
  
};

Common Issues

"State update required"

• The keeper hasn't posted recent rewards
• Query subgraph for latest harvest proof
• Use updateStateAndDeposit() instead of deposit()

"Invalid harvest proof"

• Proof may be outdated
• Always query subgraph immediately before depositing
• Proofs are block-specific

"Insufficient shares"

• Trying to redeem more osETH than you have
• Check balance: osETH.balanceOf(yourAddress)

"Vault is paused"

• Emergency pause may be active
• Check: vault.paused()
• Wait for StakeWise team to unpause

Important Notes

• APY varies: Based on Ethereum validator rewards, typically 3-5%
• osETH is rebasing: Balance increases automatically as rewards accrue
• Keeper dependency: Deposits require valid state (keeper must be active)
• Gas costs: State updates cost more gas than simple deposits
• MEV rewards: Part of harvest includes MEV extraction rewards

Resources

• StakeWise App: https://app.stakewise.io
• StakeWise Docs: https://docs.stakewise.io
• Subgraph: https://graphs.stakewise.io/mainnet-a/subgraphs/name/stakewise/prod
• Vault: 0x8A93A876912c9F03F88Bc9114847cf5b63c89f56
• Keeper: 0x6B5815467da09DaA7DC83Db21c9239d98Bb487b5