TradeX
Gasless cross-border remittances via Uniswap v4 pricing, Yellow Network & Merkle proofs
Demo
About
TradeX PRISM solves the $42B/year remittance fee problem by separating price discovery from settlement—inspired by how TradFi FX markets handle $6.6T daily. The protocol refracts each swap into two rays: - PRICE RAY: Captures live exchange rates from Uniswap V4 pools (INR/AED on Base Sepolia) as the "fixing rate" - SETTLEMENT RAY: Executes instant, gasless transfers via Yellow Network state channels (ERC-7824) PRISMHook.sol then ties them together with on-chain Merkle attestations, creating permanent proof that settlements happened at the V4 fixing rate—auditable by anyone, forever. For a Dubai worker sending AED 500 home to India: - Traditional banks: AED 40 fee, 3 days, opaque rates - PRISM: AED 2 fee, 2 seconds, provably fair V4 rate The user gets ENS support, an address book, and automatic chain-switching between Sepolia (Yellow Network) and Base Sepolia (Uniswap V4). Every swap is verified on-chain while settlement happens off-chain—zero slippage, zero gas, maximum transparency. Built for 280M migrant workers worldwide who deserve better than 3-7% fees and hidden FX markups.
How it's made
PRISM is a multi-chain protocol spanning Sepolia and Base Sepolia, orchestrating three complex systems into one seamless UX. CORE ARCHITECTURE: 1. UNISWAP V4 INTEGRATION (Base Sepolia) - Deployed custom PRISMHook.sol that inherits from BaseHook - Hook reads sqrtPriceX96 from PoolManager.getSlot0() to capture live AMM rates - Converts sqrtPrice to human-readable rate: (sqrtPrice / 2^96)^2 - Manages epoch-based "fixing rates" with 5-min TTL, mimicking TradFi FX benchmarks - INR/AED pool (fee: 3000, tickSpacing: 60) serves as the price oracle 2. YELLOW NETWORK SETTLEMENT (Sepolia) - Integrated Nitrolite SDK (@erc7824/nitrolite) for ERC-7824 state channels - WebSocket client connects to Yellow Network clearnode for off-chain messaging - YellowAdapter.sol manages session opening/closing with EIP-712 meta-transactions - Transfers execute in ~2 seconds with zero gas via state channel updates - Collateral deposited to Nitrolite Custody (0x019B...262) 3. MERKLE ATTESTATION LAYER - prismService.ts builds keccak256 Merkle trees from settlement batches - Each leaf = hash(sender, recipient, amountIn, amountOut) - PRISMHook.captureAndAttest() atomically: a) Reads V4 sqrtPriceX96 b) Stores fixing rate for current epoch c) Stores Merkle root + settlement metadata d) Emits PrismFixingRate + SettlementAttested events - Creates unique attestationId = keccak256(poolId, epoch, root, timestamp) - Anyone can verify settlements against on-chain Merkle proofs FRONTEND (Next.js 16 + React 19): - wagmi v3 + viem v2 for blockchain interactions - RainbowKit for wallet connection - Auto chain-switching: Sepolia (Yellow) ↔ Base Sepolia (V4/Hook) - ENS resolution via useEnsName/useEnsAvatar with profile display - localStorage-based contacts system with ENS label support - Real-time V4 pool state updates via uniswapV4Service.ts HACKY/NOTABLE BITS: - Cross-chain coordination without bridges: Sepolia holds Yellow Network state channels, Base Sepolia holds V4 pools + attestations. The frontend orchestrates both via automatic network switching. - sqrtPriceX96 math: Converting Uniswap's Q64.96 fixed-point format to decimal rates required careful precision handling. We use BigInt throughout to avoid floating-point errors. - Merkle tree optimization: Settlements are batched into epochs. Instead of posting every swap on-chain (expensive), we post one Merkle root per batch. This scales to 1000+ settlements/attestation. - Yellow Network integration was challenging—Nitrolite SDK is WebSocket-based, so we built a persistent connection manager in yellowNetwork.ts that handles reconnects, session persistence, and error recovery. - Hook address calculation: PRISMHook deploys to a deterministic address ending in specific flags (0x7992) to enable all hook callbacks. Used CREATE2 with salt mining. - ENS everywhere: Users can send to .eth names instead of addresses. The UI fetches ENS text records (avatar, description, Twitter) to show rich contact cards. TECH STACK: - Solidity ^0.8.26 (Hardhat, Foundry) - Uniswap V4 Core (PoolManager, BaseHook) - Yellow Network (Nitrolite SDK, ERC-7824) - Next.js 16, TypeScript, TailwindCSS - wagmi v3, viem v2, RainbowKit - Merkle tree libraries (merkletreejs) DEPLOYED & VERIFIED: - Base Sepolia: PRISMHook (0x875C...7992), V4 Pool, tokens - Sepolia: YellowAdapter (0xB023...796F), TradeX orchestrator The result: A working cross-border remittance protocol that's 95% cheaper and 12,960x faster than SWIFT, with cryptographic proof of fair pricing.