Slab.Finance

Slab.Finance is a cross-chain lending protocol for tokenized collectibles (for example trading-card NFTs). Holders lock eligible NFTs in an on-chain vault on the source chain, which notifies a hub deployment on Arc Testnet where USDC liquidity and all loan accounting live. Users borrow USDC up to limits set by oracle-attested USD value and tier-based loan-to-value (more liquid tiers allow higher LTV). Protocol includes health factor states (healthy / warning / liquidatable), rules that restrict new borrows when risk rises, and a liquidation path with a timed queue and liquidator incentive so underwater positions can be resolved fairly. The demo is built around the Arc ↔ Sepolia CCIP lane, so collateral stays where the assets are issued while borrowing happens on a USDC-native hub.

Built Solidity smart contracts with Foundry and OpenZeppelin, split into a hub on Arc Testnet (lending pool, collateral registry, oracle consumer, health factor and liquidation logic) and source-chain contracts on Sepolia (NFT vault / adapter) that talk to the hub through Chainlink CCIP for lock and unlock lifecycle messages. Pricing is designed around Chainlink CRE workflows delivering signed reports to OracleConsumer. The frontend is a Vite + React SPA in a pnpm monorepo, using Wagmi, Viem, TanStack Query, and Reown AppKit for multi-chain wallet connectivity; shared addresses and chain config live in a TypeScript shared package. There is also a NestJS backend and an indexer package. The “hacky but real” part is orchestrating two networks + CCIP message flow so users experience one product while state is split between escrow on Sepolia and USDC lending on Arc. Architecture is modular enough so that we can add more source chains in the future without any changes in the codebase - just deploy the adapter contracts in any chain and register them on hub chain.