feat: implement position health simulation, yield aggregator, fee tier system, and pool performance tracking (#731, #733, #735, #736) - #880
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Smartdevs17 merged 4 commits intoAug 29, 2026
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…r system, and pool performance tracking (Smartdevs17#731, Smartdevs17#733, Smartdevs17#735, Smartdevs17#736) - Smartdevs17#731: Build lending pool position health simulation tool - Contract: Added PositionSimulationScenario and PositionSimulationResult types in analytics.rs, with simulate_position_health and simulate_what_if functions exposed in lib.rs - API: Built /api/simulation routes and simulation.controller.ts for position health modeling, stress testing, what-if sensitivity analysis, and scenario sharing - Frontend: Enhanced PositionSimulator.tsx with What-If analysis, health factor sensitivity curve visualization, and simulation sharing - Docs: Added docs/POSITION_HEALTH_SIMULATION.md - Smartdevs17#733: Build lending pool yield aggregator with best-rate routing - API: Implemented yield-aggregator.service.ts, yield-aggregator.controller.ts, and routes for cross-pool yield discovery, non-linear dilution best-rate routing, side-by-side comparison, analytics, and yield alerts - Frontend: Built YieldAggregatorDashboard.tsx featuring interactive route optimizer, live aggregated pools table, comparison matrix, and alerts - Docs: Added docs/YIELD_AGGREGATOR_ROUTING.md - Smartdevs17#735: Build lending pool performance tracking with historical returns - Analytics & API: Added APY/APR bidirectional converters (discrete, continuous, and Stellar ledger-close frequency) and historical returns engine (cumulative, annualized, Sharpe ratio, max drawdown) - Routes & Controller: Added /api/pool-performance/apr-apy-calculator and /returns/:poolAddress endpoints - Frontend: Enhanced PerformanceDashboard.tsx with APY/APR converter and historical returns risk metrics - Docs: Added docs/POOL_PERFORMANCE_TRACKING.md - Smartdevs17#736: Implement lending pool fee tier system with loyalty discounts - Service & API: Enhanced tier.service.ts and fee-tiers.routes.ts with multi-tier qualification (Base to VIP Diamond), loyalty bonus discount mechanism, transparency breakdown calculator, and protocol analytics - Frontend: Enhanced FeeTierStatus.tsx with tier criteria table, loyalty bonus metrics, and interactive fee transparency calculator - Docs: Added docs/FEE_TIER_LOYALTY_SYSTEM.md Closes Smartdevs17#731, Closes Smartdevs17#733, Closes Smartdevs17#735, Closes Smartdevs17#736
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Summary
This pull request implements comprehensive solutions for four core lending protocol features across the smart contracts, API service, and frontend dashboard:
1. Lending Pool Position Health Simulation Tool (#731)
stellar-lend/contracts/hello-world/src/analytics.rs,lib.rs):PositionSimulationScenarioandPositionSimulationResultcontract types.simulate_position_health(env, user, scenario)for active positions andsimulate_what_if(env, collateral, debt, scenario)for arbitrary hypothetical positions.HelloContractinlib.rs.tests/analytics_test.rscovering price drops, liquidation triggers, and collateral/repayment simulations.api/src/routes/simulation.ts,api/src/controllers/simulation.controller.ts):POST /api/simulation/position: Real-time position simulation with deposit, withdrawal, borrow, and repay adjustments.POST /api/simulation/scenario: Multi-scenario stress-testing matrix (mild dip -10%, correction -25%, flash crash -40%, black swan -60%, defensive top-up, de-leverage).POST /api/simulation/what-if: Actionable sensitivity thresholds (liquidation price, max safe withdrawal, max safe borrow, deposit needed for target health).POST /api/simulation/share&GET /api/simulation/share/:id: Persistent shareable simulation scenario links.POST /api/simulation/compare&POST /api/simulation/batch: Scenario comparison and multi-pool batch simulations.frontend/src/components/PositionSimulator.tsx):docs/POSITION_HEALTH_SIMULATION.md.2. Lending Pool Yield Aggregator with Best-Rate Routing (#733)
api/src/services/yield-aggregator.service.ts,yield-aggregator.controller.ts,yield-aggregator.routes.ts):highest_yield,balanced_risk, andgas_optimized.frontend/src/components/YieldAggregatorDashboard.tsx):docs/YIELD_AGGREGATOR_ROUTING.md.3. Lending Pool Performance Tracking with Historical Returns (#735)
api/src/services/analytics/pool-performance.ts,poolPerformance.service.ts,poolPerformance.controller.ts,poolPerformance.routes.ts):GET /api/pool-performance/apr-apy-calculatorandGET /api/pool-performance/returns/:poolAddress.frontend/src/components/PerformanceDashboard.tsx):docs/POOL_PERFORMANCE_TRACKING.md.4. Lending Pool Fee Tier System with Loyalty Discounts (#736)
api/src/services/fees/tier.service.ts,api/src/routes/fee-tiers.routes.ts):daysSinceWithdrawal).POST /api/fee-tiers/transparency) explaining nominal base fee, tier discount, loyalty bonus, net fee, and cross-tier savings.GET /api/fee-tiers/analytics).frontend/src/components/FeeTierStatus.tsx):docs/FEE_TIER_LOYALTY_SYSTEM.md.Acceptance Criteria Verification
Closes #731
Closes #733
Closes #735
Closes #736