Endur Integration

Citadel Flow:
  1. User deposits WBTC
  2. Vault stakes WBTC on Endur → receives xWBTC
  3. Vault supplies xWBTC to Vesu Re7 xBTC pool
  4. Dual yield:
     ├── Endur staking rewards (xWBTC appreciation)
     └── Vesu lending APY + BTCFi STRK rewards

Trident Flow:
  1. User deposits WBTC
  2. Loop 1: Stake WBTC → xWBTC
  3. Loop 2: Stake xWBTC → xWBTC (recursive)
  4. Loop 3: Stake xWBTC → xWBTC (recursive)
  5. Result: 3x amplified staking yield

Base staking:     100 WBTC @ 4% APY = 4 WBTC/year
Recursive staking: 100 WBTC @ 4% × 3 loops = 12 WBTC/year

Apex Allocation:
  ├── 40% Vesu leverage lending
  ├── 35% Ekubo LP (WBTC-ETH or WBTC-USDC)
  └── 25% Endur staking

// Simplified Cairo pseudocode

#[external(v0)]
fn stake_on_endur(amount: u256) {
    // Approve WBTC to Endur staking contract
    wbtc.approve(endur_staking, amount);
    
    // Stake WBTC → receive xWBTC
    let xwbtc_received = endur_staking.stake(amount);
    
    // xWBTC now accrues staking rewards automatically
}

#[external(v0)]
fn unstake_from_endur(xwbtc_amount: u256) {
    // Redeem xWBTC for WBTC + rewards
    let wbtc_received = endur_staking.unstake(xwbtc_amount);
    
    // wbtc_received includes original stake + accrued rewards
}

// Trident vault's 3x recursive staking loop

#[external(v0)]
fn deploy_idle() {
    let idle_wbtc = wbtc.balance_of(self);
    
    // Loop 1: Stake WBTC → xWBTC
    wbtc.approve(endur, idle_wbtc);
    let xwbtc_1 = endur.stake(idle_wbtc);
    
    // Loop 2: Stake xWBTC → xWBTC (recursive)
    xwbtc.approve(endur, xwbtc_1);
    let xwbtc_2 = endur.stake(xwbtc_1);
    
    // Loop 3: Stake xWBTC → xWBTC (recursive)
    xwbtc.approve(endur, xwbtc_2);
    let xwbtc_3 = endur.stake(xwbtc_2);
    
    // Final xWBTC balance earns 3x amplified rewards
}

Deposit:  100 WBTC
APY:      4%
Yield:    4 WBTC/year

Deposit:  100 WBTC
Staking:  4% APY (xWBTC appreciation)
Lending:  5% APY (Vesu Re7 xBTC)
BTCFi:    10% APR (STRK rewards)
Total:    ~19% APY
Yield:    19 WBTC/year

Deposit:  100 WBTC
Loop 1:   4% APY
Loop 2:   4% APY on xWBTC (recursive)
Loop 3:   4% APY on xWBTC (recursive)
Total:    ~12% APY (3x amplification)
Yield:    12 WBTC/year

// From: ~/workspace/source/src/lib/api/vaults.ts

import { fetchVesuXwbtcBtcFi } from "@/lib/api/vesu";

const RE7_XBTC_POOL = "0x03a8416bf20d036df5b1cf3447630a2e1cb04685f6b0c3a70ed7fb1473548ecf";

// Fetch Endur staking yield (embedded in Vesu Re7 xBTC pool)
const xwbtcBtcFi = await fetchVesuXwbtcBtcFi(RE7_XBTC_POOL);

// Citadel APY breakdown:
const citadelApy = {
  endurStaking: 4.0,        // Endur xWBTC staking
  vesuLending: 5.2,         // Vesu Re7 xBTC lending
  btcFiStrk: xwbtcBtcFi,    // BTCFi STRK rewards
  total: 4.0 + 5.2 + xwbtcBtcFi,
};