SENTINAL

SENTINAL is an autonomous DeFi health monitoring system that watches $4.42B in real reserves across Aave V3 (Ethereum, Arbitrum, Base) and Lido stETH every 60 seconds using a 10-step Chainlink CRE workflow.

The Problem: Existing DeFi monitoring tools are centralized (run on AWS), reactive (alert after damage is done), single-chain, and use public thresholds attackers can simulate. Terra Luna ($40B), Euler Finance ($197M), and Wormhole ($320M) all had visible warning signs that no automated system caught in time.

How SENTINAL Works:
Every 60 seconds, a CRE CronCapability triggers the workflow. It reads live reserve data from Aave V3 smart contracts across 3 chains via batched Multicall3 EVM calls, cross-references against DeFiLlama TVL using DON median consensus across 10 nodes, detects utilization velocity spikes by comparing current vs previous cycle values stored onchain, and identifies cross-chain contagion when 2+ chains spike simultaneously. The risk engine produces a 0-100 score. A DON-signed 9-field report is written to ReserveOracleV2 on Sepolia — every report cryptographically bound to the policy version via policyHash attestation. Discord alerts fire automatically on Step 10.

The Circuit Breaker: SentinalGuard is an onchain circuit breaker any DeFi protocol integrates with 3 lines of Solidity. One require(GUARD.isSafe(address(this))) in the deposit function. When SENTINAL detects CRITICAL risk, deposits freeze automatically — no multisig, no human, under 60 seconds.

Key stats: 9 CRE capabilities active every cycle, $4.42B real mainnet data (not testnet mock), 22,000+ onchain checks completed, both contracts verified on Sepolia.

CRE Workflow (TypeScript, @chainlink/cre-sdk):

• CronCapability: triggers every 60 seconds autonomously
• EVMClient: 7 batched Multicall3 calls reading Aave V3 getReserveData() across Ethereum, Arbitrum, Base + Lido stETH
• HTTPClient: DeFiLlama TVL API with DON median consensus (consensusMedianAggregation)
• HTTPClient (Call 8): raw eth_call to Sepolia to read previousUtilizations() for velocity detection
• runtime.getSecret(): confidential policy thresholds via Chainlink secret store
• runtime.report(): DON-signed 9-field ABI-encoded report with policyHash binding
• EVMClient.writeReport(): lands DON-attested report on Sepolia (gasLimit 1,000,000)
• HTTPClient: Discord webhook alert on Step 10

Smart Contracts (Solidity, Sepolia):

• ReserveOracleV2: receives DON-signed reports via onReport(), stores 9-field data, emits 4 events per tx, calls SentinalGuard to update severity
• SentinalGuard: circuit breaker with isSafe(address) gating, global/per-protocol pause, VelocityAlert events, 3-line DeFi integration interface

Dashboard: Next.js 14, TypeScript, Tailwind CSS — live Sepolia data, velocity charts, guard status panel, vault demo card

Stack: TypeScript, Solidity Node.js, Next.js, viem, @chainlink/cre-sdk, Multicall3