PairX

This is a crucial step! Since you’re building on Arc L1, you have a massive advantage: you’re using "Institutional DeFi" tech that most hackers haven't touched yet.

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1. Short Description (88 characters) A decentralized P2P Escrow DEX on Arc L1 featuring native USDC gas and ENS trust scores.

2. Description (Min 280 characters) PairX is a non-custodial P2P marketplace designed to eliminate the counterparty risk and high fees of centralized P2P platforms. Built on the Arc L1 Economic OS, PairX allows users to trade crypto for local fiat using a secure, smart-contract-based escrow system.

Unlike traditional DEXs that require volatile tokens for gas, PairX is entirely USDC-native. By leveraging Arc’s native USDC gas integration, users can settle trades without ever holding ETH or other gas tokens, removing the biggest friction point for mainstream adoption. We’ve integrated ENS (Ethereum Name Service) to provide a transparent reputation layer, allowing traders to verify the "Completed Trades" history of their peers directly in the UI.

Our mission is to create a trustless bridge between real-world currency and the on-chain economy, optimized for the speed and predictability of institutional-grade stablecoin finance.

The core of PairX is a Solidity-based state machine deployed on the Arc L1 Testnet (Chain ID: 5042002). We utilized Hardhat for development, ensuring compatibility with Arc’s unique architecture where msg.value represents the native USDC gas token (18 decimals). This allowed us to build a "Single-Token UX" where the asset being traded and the gas fee are the same currency.

For the frontend, we built a responsive dashboard using Next.js and Wagmi. We implemented a custom hook to resolve ENS names and avatars, which we then cross-reference with our on-chain trade history to generate a Reputation Score for every address.

A particularly "hacky" challenge we overcame was handling the deterministic sub-second finality of Arc's Malachite consensus. We had to optimize our frontend listeners to handle near-instant state changes without UI flickering, providing a "Web2-speed" experience for a decentralized application. We also utilized Dotenv for secure environment management and ArcScan APIs for transaction verification.