Chrono Protocol

The Duration-Bound Money Market on Hedera

"The shorter you borrow, the more you can borrow."

Warning

⚠️ Official Deprecation Notice: Frontend & Backend Components

The web frontend (chrono-web/) and API/indexer backend (chrono-web/backend/) in this monorepo are OFFICIALLY DEPRECATED and will receive no further maintenance in this repository. Active development of the Chrono user interface and off-chain indexing services has migrated to private, closed-source repositories managed by ChronoLabs. This repository remains the source of truth for the core smart contracts, economic architecture, and protocol mathematics under the Business Source License 1.1.

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⚡ Overview

Traditional money markets (Aave, Compound, Morpho) treat risk statically: a 10-minute arbitrage borrow is subjected to the exact same conservative Loan-to-Value (LTV) cap as a 6-month speculative loan.

Chrono Protocol fundamentally alters this paradigm by introducing duration-bound borrowing. Rooted in quantitative risk-time equivalence ($\text{Risk} = \sigma \cdot \sqrt{t}$), Chrono mathematically exploits the narrow variance window of shorter loans to unlock up to $10\times$ leverage (90% LTV) for short-term borrowers while enhancing overall protocol solvency.

Positions enforce terminal execution through Hedera Schedule Service (HSS / HIP-1215) native autonomous scheduled transactions — eliminating third-party liquidator keeper bounties, MEV searcher front-running, and off-chain execution latency.

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📊 The Numbers Unlocked by Chrono

Metric	Traditional Money Markets (Aave / Compound)	Chrono Protocol	Impact / Unlock
Max Allowable LTV	Static 70% – 75%	Up to 90.0% Dynamic LTV	$+1500\text{ bps}$ capital efficiency for short-term borrowers
Maximum Leverage	$3.3\times$ – $4.0\times$	Up to $10.0\times$ Leverage	$2.5\times$ more borrowing power on 1-hour durations
Hard Liquidation Trigger	Manual bot / Off-chain keeper	100% Autonomous (HSS / 0x16b)	Zero keeper dependency, immune to mempool spikes
Soft Liquidation Bonus	Static 5% – 10% penalty	Continuous Dutch Auction (CD3)	$0$ toxic MEV front-running, fair market price discovery
Compounding Precision	Taylor Series truncation	PRBMath UD60x18 $\exp(rt)$	$+27.72%$ precision error eliminated at high APY regimes
Transaction Latency & Cost	12s blocks, volatile gas spikes	3.2s finality, <$0.001 fixed fee	High-frequency collateral management on Hedera

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🧠 Core Philosophy & Risk-Time Equivalence

In quantitative finance, asset price dispersion scales with the square root of elapsed time:

$$\text{Risk} = \sigma \cdot \sqrt{t}$$

• Over 1 hour, the expected standard deviation of asset price movement is tiny.
• Over 1 day ($24\times$ longer), risk is only $\sqrt{24} \approx 4.9\times$ larger.
• Over 7 days, risk is $\sqrt{168} \approx 13.0\times$ larger than a 1-hour window.

Because price variance is disproportionately compressed over short time horizons, a 1-hour loan is significantly safer than a 30-day loan. Chrono reflects this mathematical truth directly in its dynamic borrowing curve:

$$\text{LTV}(t) = \text{LTV}_{\text{base}} + (\text{LTV}_{\text{max}} - \text{LTV}_{\text{base}}) \cdot e^{-k \cdot t}$$

Max LTV
  100% │
   90% │● (10x Leverage @ 1h)
       │ ╲
   85% │  ╲ (7.7x Leverage @ 12h)
       │   ╲
   80% │    ╲ (6.25x Leverage @ 24h)
       │     ╲─────────────────────────────── Baseline LTV (75% / 4x @ 7d+)
   70% │
       └──────────────────────────────────────── Duration (t)
       0h   12h   24h         7d           30d

Calibrated Leverage Schedule

Duration	Max LTV	Leverage	Core Use Cases
1 Hour	90.0%	$10.0\times$	DEX arbitrage, flash-loan alternatives, liquidation bridges, automated rebalancing
12 Hours	87.0%	$7.7\times$	Intraday momentum trading, event-driven hedging, news-cycle exposure
1 Day	84.0%	$6.25\times$	Daily yield harvesting, cross-venue collateral farming, delta-neutral spreads
7 Days	75.0%	$4.0\times$	Multi-day swing positions, traditional DeFi collateralized borrowing
30 Days	75.0%	$4.0\times$	Conservative medium-term liquidity financing

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🛡️ Dual-Liquidation Architecture

Chrono protects protocol solvency through two decoupled, complementary liquidation paths:

[Borrow Position Created]
          │
          ├───► [Price Drop (HF <= 1.0)] ────► [Soft Liquidation / Dutch Auction Engine (CD3)]
          │                                     • Clears via Euler-inspired continuous discount
          │                                     • Auction starts +2% above oracle; zero toxic MEV
          │                                     • Closes debt partially; restores position health
          │
          └───► [Time Reaches T_expiry]  ────► [Hard Liquidation / Hedera Scheduled Transaction]
                                                • 100% autonomous trigger via HSS (0x16b)
                                                • Settles via Stability Pool (Liquity-style O(1))
                                                • Dual-Tranche penalty: 75% to SP, 25% to Reserve
                                                • Solvency-gated surplus collateral refund

1. Soft Liquidation (Solvency Default: $HF \le 1.0$)

• Mechanism: Euler-inspired continuous Dutch Auction with the Chrono Dynamic-Discount Engine (CD3).
• Fair Price Discovery: The auction starts with a $+2%$ premium above oracle price and decays smoothly downwards. Liquidators compete on price rather than transaction ordering, eliminating toxic priority gas wars (PGA) and MEV censorship.
• Equity Preservation: The borrower loses only what the market clears at, preserving residual equity.

2. Hard Liquidation (Duration Expiration: $t \ge T_{\text{expiry}}$)

• Autonomous Settlement: Invoked natively by the Hedera Schedule Service at the position's exact expiration timestamp.
• 3-Tier Settlement Waterfall:
  1. Lender Invariant: 100% debt repaid to LendingPool via returnBorrowLiquidity.
  2. Dual-Tranche Penalty Split: 12% default penalty (calibrated with a 2.5% collateral floor) split 75% to StabilityPool depositors and 25% to the Protocol Reserve.
  3. Solvency-Gated Surplus Remittance: Surplus collateral is refunded to the borrower if and only if stabilityPool.canAbsorb == true. If the Stability Pool is under-capitalized, surplus remains locked and collateral is seized to the protocol recovery reserve.
  4. 15-Minute HSS Grace Window: 900-second buffer absorbs Hedera consensus timestamp jitter; a 1.5% late fee applies if repaid during grace.

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🔬 Coming Soon: Novel Stochastic Interest Rate Model (IRM)

While Chrono's current engine employs a continuous dual-kink piecewise curve with a Global Cumulative Borrow Index ($I_t$), active development is underway on a continuous stochastic PID-controlled IRM:

• Continuous Volatility Adaptation: Adjusts interest rates not merely on static utilization snapshots ($U$), but dynamically incorporates utilization velocity ($\frac{dU}{dt}$) and trailing asset volatility drift.
• Kink Elimination: Removes arbitrary piecewise thresholds, generating smooth, predictable borrowing costs that protect against large-borrow rate manipulation.
• Zero Retroactive Exploits: Eliminates the "time-machine" rate manipulation vulnerability common to discrete multi-position money markets.

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🏗️ System Architecture

flowchart TD
    User([Borrower / Lender]) -->|Deposit / Borrow / Repay| Router[ChronoRouter]
    Router -->|Collateral Storage| Vault[BorrowVault]
    Router -->|Capital Supply| LPool[LendingPool]

    Vault -->|Risk & LTV Check| REngine[RiskEngine]
    Vault -->|Rate Accrual| IEngine[InterestEngine]
    Vault -->|Asset Config| AReg[AssetRegistry]
    Vault -->|Schedule Expiry| SEngine[SchedulerEngine]

    SEngine -->|Native HIP-1215 Hook| HSS[(Hedera Schedule Service\n0x16b)]
    HSS -.->|Autonomous Execution| LiqEngine[LiquidationEngine]

    LiqEngine -->|Debt Absorption| SPool[StabilityPool]
    LiqEngine -->|Price Feeds| Oracle[PythOracleAdapter]
    LiqEngine -->|Collateral Settlement| Vault
    LiqEngine -->|Return Liquidity| LPool

Loading

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📍 Testnet Deployments (Hedera Testnet — Chain ID: 296)

All core protocol contracts are deployed and verified on Hedera Testnet:

Contract	Address	Explorer Link
BorrowVault	0x7742d8C4CE85CC901718B9513cdBf54e78a641EC	HashScan
LendingPool	0x5B05F8dF74eee9BC8703e9517A52539b2d5d9BDB	HashScan
StabilityPool	0xd8BfcaC348093aC49EDfD4013c3693fD5c3fafBa	HashScan
ChronoRouter	0x5B0110008792efb6CC4B4fa1Cf345CF024F4F2Da	HashScan
LiquidationEngine	0xa73284912422aad12764d7c7922920cf5906cbF5	HashScan
SchedulerEngine	0x38167c3F80d2684B7eE7192e24b11a8015399558	HashScan
AssetRegistry	0x66852201732a4D4CD994a12Ec50425733a8aD924	HashScan
InterestEngine	0x35457D520d7E0A1E8446Eba8044d910a8ABD3d4c	HashScan
RiskEngine	0xA081a818F81293dF402cCE38181A3c7b74b37bFc	HashScan
PythOracleAdapter	0x1C15A0852cdd0C466bb5006f7a49d91fbE7527e7	HashScan
WrappedTokenFactory	0x9E88Cdd088C76375Db8Ab7135d43429fBa1D6E2C	HashScan
wUSDC (HTS)	0x000000000000000000000000000000000098a590	HashScan
wETH (HTS)	0x000000000000000000000000000000000098a593	HashScan
wBTC (HTS)	0x000000000000000000000000000000000098A597	HashScan

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🚀 Quickstart & Development

Prerequisites

• Node.js >= 18.0.0
• npm or pnpm

Installation

git clone https://github.com/LordRyuga/Chrono_hedera.git
cd Chrono_hedera
npm install

Compile Smart Contracts

npx hardhat compile

Run Test Suite (66 Unit & Integration Tests)

npx hardhat test

Deploy to Hedera Testnet

npx hardhat run scripts/deploy/deploy.ts --network testnet

Seed Protocol Liquidity

npx hardhat run scripts/seed.ts --network testnet

Run Frontend & Backend

# Start Backend Relayer & Indexer (port 3001)
cd chrono-web/backend
npm install
npm run dev

# Start Frontend UI (port 5173)
cd ../
npm install
npm run dev

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📚 Deep Dive & Documentation

• 📘 Chrono Protocol Primer (Non-Technical): Intuitive, step-by-step primer explaining duration risk, Dutch auctions, and overcollateralization from scratch.
• 📑 Chrono Protocol Whitepaper: Mathematical formulations, dynamic decay functions, and risk models.
• 📐 Hard Liquidation Specification: 3-tier settlement waterfall, dual-tranche penalty accounting, and grace window jitter proofs.
• 🧪 Hard Liquidation Test Verification Report: Invariant proofs and end-to-end integration test runs.
• ⚖️ Soft Liquidation Dutch Auction Analysis (CD3): Architectural evaluation comparing Euler v2, Morpho Blue, and Chrono Dynamic-Discount Engine.
• 📈 Interest Rate & Utilization Analysis: Mathematical proofs of pre-borrow vs. post-borrow rate dynamics and integral pricing.

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📄 License

This project is licensed under the Business Source License 1.1 (BUSL-1.1), converting to Apache 2.0 on October 14, 2030.
Copyright © 2024–2026 Ishaan Singh. All rights reserved.