[FEATURE] DeFi: Implement yield farming aggregator service (#43)

[KevinMB0220]

📋 Feature Description

Clear and concise description of the feature:
Create a yield farming aggregator service YieldFarmingAggregator that programmatically evaluates yield options across Blend pools, Soroswap pools, and internal Vault strategies, and provides a unified interface to deposit assets into the source of highest APR/APY.

🎯 Motivation

Why is this feature needed? What problem does it solve?
Tracks roadmap item #43. This allows developers and automated agents to query multiple yield-bearing protocols, compare their returns, and automate allocation without manual repositioning.

💡 Proposed Solution

How should this feature work? Include technical details:
Build a core service class in packages/core/defi-protocols that fetches rates from Blend pools, Soroswap reserves, and vault configurations. Expose deposit, withdraw, and optimize/rebalance methods.

🔧 Technical Implementation

Implementation details for AI/developers:

Files to Create/Modify

• packages/core/defi-protocols/src/services/yield-farming-aggregator.ts

Dependencies

• None additional

API Changes

export interface YieldOpportunity {
  protocol: string;
  asset: string;
  apy: number;
  tvl: string;
}
export class YieldFarmingAggregator {
  async getOpportunities(): Promise<YieldOpportunity[]>;
  async deposit(opportunity: YieldOpportunity, amount: string): Promise<string>;
}

✅ Acceptance Criteria

• Correctly fetches and aggregates APY rates.
• Deposits route successfully through the chosen protocol.
• Unit tests cover rebalancing calculations.

📚 Additional Context

None.

🔗 Related Issues

• Relates to [FEATURE] Create yield vault Soroban contract #281 and [FEATURE] Implement auto-compounding yield strategy #282

🏷️ Labels

Phase: phase-3
Component: defi
Priority: high

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[thaiwoz02]

@thaiwoz02 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello Maintainer, I would like to work on this issue.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @thaiwoz02 to this issue.

[sotoJ24]

@sotoJ24 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello team hope you're doing well, here is how I plan to solve it:

• Create a yield farming aggregator service YieldFarmingAggregator.

• First
  packages/core/defi-protocols.

• Build a core service class in packages/core/defi-protocols.

• Create packages/core/defi-protocols/src/services/yield-farming-aggregator.ts

• Unit tests cover rebalancing calculations.

Best

ℹ️ Repo Maintainers: To accept this application, review their application or assign @sotoJ24 to this issue.

[drips-wave]

Congratulations, @sotoJ24! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @sotoJ24: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

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