Architecture & Smart Contracts

How the Stacked Yield vault is structured onchain and the role of automation.

Smart contract base

• Built on Chamber, the asset-management infrastructure powering mStable. Chamber provides non-custodial vault logic, ERC20 token issuance, and the guardrails that integrations plug into.

• Chamber is a battle-tested set of contracts also used by Toros Finance and other Chamber vaults. Chamber was previously known as dHEDGE.

• Stacked Yield is a single Chamber vault, with mPT-sUSDe as its ERC20 share token.

Automation and bots

• Rebalance bots: adjust positions to maintain safe health factors.

• Capacity bots: secure Aave borrow slots when caps reset, ensuring the vault retains access.

• Position rollovers (for example into the next Pendle PT series) are handled by mStable as part of active vault management, not by a dedicated bot.

• All actions are non-custodial. Bots execute predefined strategies and do not hold user funds.

Permissions and safety

• Pause functions: emergency shutdown tools to halt deposits or rollovers if needed.

• Risk limits: leverage and health-factor thresholds enforced by the rebalance bots.

Contract addresses (Ethereum Mainnet)

mPT-sUSDe