Yield Source Adapters

Each yield source (Blend, Kamino, Aave) has a standardized adapter contract that the vault uses to deposit, withdraw, and check balances.

Adapter Interface

rust

/// Standard interface all yield adapters must implement
pub trait YieldAdapter {
    /// Deposit assets into the yield source
    fn deposit(env: Env, amount: i128) -> i128;

    /// Withdraw assets from the yield source
    fn withdraw(env: Env, amount: i128) -> i128;

    /// Check current balance in the yield source
    fn balance_of(env: Env) -> i128;

    /// Get current APY (in basis points, e.g., 950 = 9.50%)
    fn current_apy(env: Env) -> u32;
}

Blend Adapter (Native Stellar)

rust

#[contract]
pub struct BlendAdapter;

#[contractimpl]
impl BlendAdapter {
    pub fn deposit(env: Env, amount: i128) -> i128 {
        let blend_pool = Self::get_pool_address(&env);
        // Call Blend's lending pool deposit
        blend_pool::supply(&env, &env.current_contract_address(), amount);
        amount
    }

    pub fn withdraw(env: Env, amount: i128) -> i128 {
        let blend_pool = Self::get_pool_address(&env);
        blend_pool::withdraw(&env, &env.current_contract_address(), amount);
        amount
    }

    pub fn balance_of(env: Env) -> i128 {
        let blend_pool = Self::get_pool_address(&env);
        blend_pool::get_balance(&env, &env.current_contract_address())
    }

    pub fn current_apy(env: Env) -> u32 {
        // Fetch from Blend's rate oracle
        850 // 8.50% example
    }
}

Yield Source Registry

The registry contract tracks which adapters are approved, their risk scores, and maximum allocation limits.

rust

pub struct YieldSource {
    pub adapter: Address,     // Adapter contract address
    pub name: String,         // "Blend", "Kamino", etc.
    pub risk_score: u32,      // 1-10 (1 = lowest risk)
    pub max_allocation: u32,  // Max % of vault this source can hold
    pub is_active: bool,
}

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