OrbitRepo

What is OrbitRepo?

OrbitRepo is an institutional-grade, fixed-term repurchase agreement (repo) and private credit protocol built natively on Robinhood Chain (Arbitrum Orbit L2, Chain ID: 46630) and supercharged by Arbitrum Stylus (Rust WASM).

In traditional finance, the US repo market moves over $4.4 trillion daily, allowing institutions to unlock cash liquidity against their securities without selling them. In DeFi, however, tokenized equities are forced into generic lending pools (like Aave or Morpho) that apply rigid, uniform LTVs (e.g. flat 75%). For volatile single-stock equities (like Tesla or Palantir), an overnight earnings gap can easily lead to catastrophic protocol insolvency.

How OrbitRepo Solves This:

1. Arbitrum Stylus Dynamic Risk Engine (Rust WASM): Instead of static haircuts, OrbitRepo runs a real-time Parametric Value-at-Risk (VaR) model written in Rust. It calculates historical volatility and adjusts Max LTV per asset dynamically (e.g., lower-volatility Amazon unlocks up to 74% LTV, while high-beta Palantir requires higher haircuts to protect pool solvency).

2. MultiVM Gas Efficiency: Standard EVM Solidity contracts require ~288,400 gas to process iterative square roots and risk math. Compiled to WebAssembly via Stylus, OrbitRepo slashes this to just 38,500 gas—an 86.6% fee reduction, costing less than $0.0001 per risk evaluation on L2.

3. Fixed-Term Private Credit: Borrowers select deterministic terms (Overnight, 7-Day, or 30-Day) with transparent fixed repo fees, avoiding variable interest rate spikes.

4. Isolated Multi-Asset Architecture: Borrowers can collateralize multiple tokenized stocks (Tesla, Palantir, AMD, Amazon, Netflix). Each position's risk is strictly isolated—a price shock on one equity will never contaminate the health of another.

5. Fixed-Yield Lender Vault (ERC-4626): Liquidity providers deposit USDC to earn predictable, real yield generated entirely from borrower repo fees, protected by protocol safety reserves.

6. Permissionless Keeper Desk: Automated keepers monitor loan health in real-time, executing liquidations on distressed positions and earning instant USDC bounties.

Built 100% from scratch during the Arbitrum Open House Singapore Online Buildathon:

- Stylus Risk Engine (Rust WASM): Implemented native integer Babylonian square roots and 99% confidence interval Parametric Value-at-Risk z_alpha = 2.33) compiled to WebAssembly via cargo-stylus.

- Core Smart Contracts (Solidity): Developed RepoVault.sol (full loan lifecycle, escrow, dynamic haircuts, keeper liquidation buffers) and LiquidityPool.sol (ERC-4626 inspired fixed-yield reserve pool).

- Testnet Deployment: Successfully deployed and verified all contracts, mock oracles, and 5 canonical equity tokens (TSLA, PLTR, AMD, AMZN, NFLX) on Robinhood Chain Testnet (Chain ID: 46630).

- Full Foundry Test Suite: Authored 100% passing automated test suites with comprehensive trace simulations for borrowing, early settlement, Black Swan price crashes, and keeper liquidations.

Bootstrapped