RajaSwap

RajaSwap is a decentralized, trustless Over-The-Counter (OTC) swap protocol built on the Mantle Sepolia Layer 2 network.

It enables users to trade any ERC-20 token directly with another party without slippage, using an off-chain order book (Supabase) for gas-less order creation and on-chain settlement for complete security.

🌟 Features

• Trustless OTC Swaps: Securely swap ERC-20 tokens with 0 slippage.

• Gas-less Listings: Creating an order is free (off-chain EIP-712 signature). Gas is only paid when filling an order.

• Partial Fills: Orders can be partially filled, allowing flexible trading.

• Private & Public Orders: Create orders for a specific wallet or open to the public.

• Order Advertising: Promote your order by paying a fee in MNT for increased visibility.

• Xellar Wallet Integration: Seamless onboarding with Xellar's embedded wallet and social login.

• Fee Structure: A configurable protocol fee (default 0.1% or 10 BPS) is charged to the Maker upon success.

• Non-Custodial Listings: Assets remain in your wallet until the swap is executed. No depositing into a contract required.

• Shareable Order Links: Every order has a unique URL, perfect for sharing via DM or social media for direct deals.

• Verified Token Badges: Visual indicators for trusted tokens to ensure safety against impostor assets.

• Real-time Sync: Order status is synced from blockchain to database automatically.

🏗 Tech Stack

• Blockchain: Mantle Sepolia Testnet

• Smart Contract: Solidity

• Frontend: Next.js, Tailwind CSS, Wagmi, Viem

• Wallet: Xellar Kit

Backend: Supabase (Edge Functions, PostgreSQL)

🛡 Security

• EIP-712 Signatures: Orders are cryptographically signed by the Maker.

• Nonce Management: Prevents replay attacks.

• Deadline Enforcement: Orders automatically expire.

• On-chain Verification: All transactions are verified on the blockchain before database updates.