The problem YieldWeaver solves

Yield in DeFi is often fragmented across multiple protocols, each requiring complex monitoring and manual rebalancing.

YieldWeaver automates this by composing Spark’s yield sources — SparkSavings and SparkLend — into a single smart vault that allocates deposits based on predefined risk and efficiency rules.

Users get:

• One-click exposure to multiple Spark yield strategies.

• Automatic rebalancing and idle management.

• Transparent donation of profits to a configured recipient (Octant-style).

This reduces complexity for users, improves capital efficiency for Spark’s ecosystem, and makes yield automation transparent, reproducible, and auditable.

Challenges I ran into

Building a composable vault that interacts seamlessly with SparkSavings and SparkLend required:

• Handling two distinct ERC-4626 interfaces and aligning them under unified logic.

• Managing CREATE2 deterministic deployments for reproducibility and predictable addresses.

• Testing on a Tenderly Virtual Mainnet (chainId 8) with real Spark contracts and simulated deposits.

• Implementing donation-aware tokenized strategies (Octant V2 semantics) that mint/burn shares on profit/loss without breaking ERC-4626 invariants.