Staking

Direct WBTC staking into Vesu lending pools for yield + STRK rewards

Staking

Direct WBTC staking into Vesu lending pools for base lending yield plus STRK rewards from the BTCFi Season incentive program.

Overview

Sable’s staking feature allows users to supply WBTC directly to Vesu lending pools and earn:

• Base lending APY: Interest from borrowers
• STRK rewards: 100M STRK BTCFi Season incentives
• Auto-compounding: vToken balance grows automatically

Available Pools

Pool	Vesu Pool ID	vToken	Description
Vesu PRIME	0x0451fe...c3b5	vWBTC (0x04ecb0...f56c)	Base WBTC lending pool. Highest liquidity.
Re7 xBTC	0x03a841...8ecf	vWBTC-Re7xBTC (0x0131cc...52a0)	Endur staked BTC (xWBTC) lending pool. Higher yield from staking.

Pool Details

Vesu PRIME

Pool Name: Vesu PRIME WBTC

Pool ID: 0x0451fe483d5921a2919ddd81d0de6696669bccdacd859f72a4fba7656b97c3b5

vToken: 0x04ecb0a4c2c3e6f4e16a2ccf90db0497024bad7d3beaec832e0da8c7ce4714f56c

Asset: WBTC (pure Bitcoin)

Yield Sources:

• Lending APY: 3-6% (variable, depends on utilization)
• STRK rewards: ~2-4% APR
• Total APY: ~5-10%

Risk: Low (single-asset lending, no leverage)

PRIME is the most liquid WBTC pool on StarkNet. Ideal for large deposits and quick withdrawals.

Re7 xBTC

Pool Name: Re7 xBTC Staking Pool

Pool ID: 0x03a8416bf20d036df5b1cf3447630a2e1cb04685f6b0c3a70ed7fb1473548ecf

vToken: 0x0131cc2844c5c3e2c908edbf8eea85b8a2e5b0a52dcb8d1e8e5a0f5da6a752a0

Asset: xWBTC (Endur liquid staking token)

Yield Sources:

• xWBTC staking yield: 4-7% APR
• Lending APY: 2-5% (on top of staking)
• STRK rewards: ~3-5% APR
• Total APY: ~9-17%

Risk: Medium (xWBTC de-peg risk, staking protocol risk)

xWBTC is a liquid staking derivative. If Endur protocol is compromised, xWBTC may lose its peg to WBTC.

Staking Flow

1. Approve WBTC

   User approves WBTC to Vesu Singleton contract:

   WBTC.approve(VESU_SINGLETON, stake_amount)
   

   Vesu Singleton: 0x000d8d6dfec4d33bfb6895de9f3852143a17c6f92fd2a21da3d6924d34870160

2. Supply to Pool

   Call supply() on Vesu Singleton:

   VesuSingleton.supply(
     pool_id,       // e.g., PRIME pool ID
     WBTC_ADDRESS,  // Asset to supply
     stake_amount   // Amount in sats (8 decimals)
   )
   

   You receive vTokens representing your staked position.

3. Earn Yield

   vToken balance grows automatically as interest accrues:

   Initial: 1.0 WBTC staked → 1.0 vWBTC
   After 30 days at 8% APY: 1.00657 vWBTC
   After 1 year at 8% APY: 1.08 vWBTC
   

   You don’t need to claim rewards. vToken balance auto-compounds continuously.

4. Unstake (Withdraw)

   Withdraw your WBTC by burning vTokens:

   VesuSingleton.withdraw(
     pool_id,
     WBTC_ADDRESS,
     withdraw_amount  // Amount of WBTC to receive
   )
   

   vTokens are burned, you receive WBTC (more than you deposited).

vToken Mechanics

vTokens are interest-bearing receipt tokens that appreciate over time:

vToken Exchange Rate = Total Pool Assets / Total vToken Supply

Example (PRIME pool):
  Total WBTC in pool: 100 WBTC
  Total vWBTC supply: 95 vWBTC
  Exchange rate: 100 / 95 = 1.0526 WBTC per vWBTC
  
  If you hold 1 vWBTC:
    Redeemable: 1 × 1.0526 = 1.0526 WBTC

Why vToken Balance Grows

As borrowers pay interest, the pool’s total assets increase, but vToken supply stays constant:

Day 0:
  Pool assets: 100 WBTC
  vToken supply: 95 vWBTC
  Exchange rate: 1.0526

Day 30 (8% APY):
  Pool assets: 100.657 WBTC (interest accrued)
  vToken supply: 95 vWBTC (unchanged)
  Exchange rate: 1.0596
  
  Your 1 vWBTC now redeems for 1.0596 WBTC (+0.7%)

APY Breakdown

Lending APY Calculation

Base lending APY depends on pool utilization:

Utilization = Total Borrowed / Total Supplied

Borrow Rate (variable):
  • 0-60% util: 2-5% APR
  • 60-80% util: 5-10% APR
  • 80-100% util: 10-30% APR (steep curve)

Supply APY = Borrow Rate × Utilization

Example:
  Borrow rate: 8% APR
  Utilization: 70%
  Supply APY: 8% × 0.7 = 5.6%

STRK Rewards

BTCFi Season: 100M STRK distributed over 6 months to BTC liquidity providers on StarkNet.

Allocation:

• Vesu PRIME: ~40% of rewards pool
• Re7 xBTC: ~30% of rewards pool
• Other BTC pools: ~30%

Distribution:

• Rewards accrue per block based on your % of pool TVL
• Claimable weekly via Vesu frontend
• Estimated 2-5% APR in STRK

STRK rewards are not included in vToken appreciation. You must claim separately on Vesu.

Pool TVL & Utilization

PRIME Pool

Typical Metrics:

TVL: $15-25M
Total Supplied: 150-250 WBTC
Total Borrowed: 80-150 WBTC
Utilization: 50-70%
Lending APY: 4-6%
STRK APR: 3-4%
Total APY: 7-10%

Re7 xBTC Pool

Typical Metrics:

TVL: $5-10M
Total Supplied: 50-100 xWBTC
Total Borrowed: 20-50 xWBTC
Utilization: 40-60%
xWBTC Staking Yield: 5-7%
Lending APY: 3-5%
STRK APR: 3-5%
Total APY: 11-17%

Stake vs Unstake

Action	Function	Effect
Stake	supply()	Deposit WBTC, receive vTokens
Unstake	withdraw()	Burn vTokens, receive WBTC
Partial Unstake	withdraw(amount)	Burn some vTokens, receive partial WBTC

Example Staking Journey

Day 1: Stake

Action: Stake 1.0 WBTC into PRIME

Transaction:
  WBTC.approve(VESU_SINGLETON, 100_000_000)  // 1.0 WBTC
  VesuSingleton.supply(PRIME_POOL_ID, WBTC, 100_000_000)

Result:
  Received: 0.95 vWBTC (current exchange rate: 1.0526)
  WBTC balance: 0
  vWBTC balance: 0.95

Day 30: Check Balance

vWBTC balance: 0.95 (unchanged)
Exchange rate: 1.0596 (grown from 1.0526)

Redeemable WBTC: 0.95 × 1.0596 = 1.00662 WBTC
Earned: 0.00662 WBTC (0.662% in 30 days ≈ 8% APY)

Day 60: Partial Unstake

Action: Withdraw 0.5 WBTC

Transaction:
  VesuSingleton.withdraw(PRIME_POOL_ID, WBTC, 50_000_000)

Exchange rate: 1.0667
vWBTC to burn: 0.5 / 1.0667 = 0.4687 vWBTC

Result:
  Received: 0.5 WBTC
  vWBTC balance: 0.95 - 0.4687 = 0.4813 vWBTC
  Remaining WBTC value: 0.4813 × 1.0667 = 0.5133 WBTC

Day 365: Full Unstake

vWBTC balance: 0.4813
Exchange rate: 1.1368 (8% APY compounded)

Action: Withdraw all

Transaction:
  VesuSingleton.withdraw(PRIME_POOL_ID, WBTC, 54_713_000)

Result:
  Received: 0.54713 WBTC
  Original stake: 1.0 WBTC
  Withdrawn so far: 0.5 + 0.54713 = 1.04713 WBTC
  Total profit: 0.04713 WBTC (4.713% net after partial unstake)

Vesu Singleton Contract

Address: 0x000d8d6dfec4d33bfb6895de9f3852143a17c6f92fd2a21da3d6924d34870160

Key Functions:

// Supply asset to pool (stake)
fn supply(
    pool_id: felt252,
    asset: ContractAddress,
    amount: u256
);

// Withdraw asset from pool (unstake)
fn withdraw(
    pool_id: felt252,
    asset: ContractAddress,
    amount: u256
);

// View functions
fn balance_of(
    pool_id: felt252,
    asset: ContractAddress,
    user: ContractAddress
) -> u256;  // Returns vToken balance

fn total_assets(
    pool_id: felt252,
    asset: ContractAddress
) -> u256;

fn total_supply(
    pool_id: felt252,
    asset: ContractAddress
) -> u256;  // vToken supply

Comparing to Vault Deposits

Feature	Staking (Direct Vesu)	Vault Deposits
Underlying Asset	WBTC supplied to Vesu	WBTC deployed to multi-step strategies
Receipt Token	vWBTC (Vesu’s ERC-4626)	yvBTC (Sable’s ERC-4626)
Yield Source	Lending APY + STRK	Lending + Staking + LP + Leverage
APY Range	5-10% (PRIME), 11-17% (Re7)	8-25% (depends on vault)
Risk	Low-Medium	Low-High (depends on vault)
Complexity	Simple (1-step supply)	Complex (multi-protocol strategies)
Withdraw Time	Instant (if liquidity available)	May require flash loan unwind
Auto-Compound	Yes (vToken appreciation)	Yes (share price growth)

When to stake directly:

• You want simplicity and lower risk
• You need quick withdrawals
• You prefer single-protocol exposure

When to use vaults:

• You want maximum yield
• You’re comfortable with leverage/LP strategies
• You can tolerate multi-protocol risk

Liquidity & Withdrawals

Withdrawals depend on pool liquidity:

Pool Liquidity = Total Supplied - Total Borrowed

Example (PRIME pool):
  Total supplied: 200 WBTC
  Total borrowed: 120 WBTC
  Available liquidity: 80 WBTC
  
  You can withdraw up to 80 WBTC instantly.
  Larger withdrawals require waiting for borrowers to repay.

At very high utilization (>95%), withdrawals may be delayed until borrowers repay or new deposits arrive.

Risk Factors

Smart Contract Risk

• Vesu protocol bug or exploit
• Sable frontend bug (does not affect funds)
• StarkNet consensus failure

Mitigation: Vesu is audited and battle-tested. TVL > $50M.

Oracle Risk

• Pragma oracle manipulation
• Stale price feeds causing incorrect liquidations

Mitigation: Pragma uses multiple data sources with outlier detection.

Liquidity Risk

• High utilization prevents withdrawals
• Bank run scenario (everyone withdraws at once)

Mitigation: Interest rate curve discourages high utilization. Max utilization capped at 100%.

xWBTC Depeg (Re7 pool only)

• Endur protocol hack or bug
• xWBTC loses peg to WBTC
• Re7 pool value drops

Mitigation: Only stake in Re7 if you understand Endur staking risks. PRIME pool has no depeg risk.

STRK Rewards Claiming

STRK rewards are distributed by Vesu, not Sable:

1. Visit Vesu App

   Go to app.vesu.xyz and connect your wallet.

2. Check Claimable Rewards

   Navigate to “Rewards” tab. View your accrued STRK from WBTC staking.

3. Claim STRK

   Click “Claim” to receive STRK tokens to your wallet.

   Claiming has gas costs. Wait until you have a meaningful amount (e.g., > $10) to claim.

Staking Pools Contract Addresses

Vesu PRIME

Component	Address
Pool ID	0x0451fe483d5921a2919ddd81d0de6696669bccdacd859f72a4fba7656b97c3b5
vWBTC Token	0x04ecb0a4c2c3e6f4e16a2ccf90db0497024bad7d3beaec832e0da8c7ce4714f56c
Asset	WBTC (0x03fe2b97c1fd336e750087d68b9b867997fd64a2661ff3ca5a7c771641e8e7ac)

Re7 xBTC

Component	Address
Pool ID	0x03a8416bf20d036df5b1cf3447630a2e1cb04685f6b0c3a70ed7fb1473548ecf
vWBTC-Re7xBTC Token	0x0131cc2844c5c3e2c908edbf8eea85b8a2e5b0a52dcb8d1e8e5a0f5da6a752a0
Asset	xWBTC (Endur)

Next Steps

Stake Your WBTC

Step-by-step guide to earning yield

Claim STRK Rewards

How to claim BTCFi Season rewards

Vesu Integration

Technical docs on Vesu pools

Compare to Vaults

Staking vs Vault deposits explained