Confidex – Confidential Trading, Uncompromised Privacy

Confidex is a fully confidential, MEV-resistant decentralized exchange that integrates secure computing, confidential ERC20, and blockchain-based attestation logic to deliver a seamless and private trading experience. Built using Inco’s Fully Homomorphic Encryption (FHE) stack and deployed on Base Sepolia, Confidex enables fair and tamper-proof swaps without revealing user balances or trading intents.

We have 3 submodules:

• confidex-contract: Smart contracts using Inco FHE on Base Sepolia.
• confidex-next: Frontend built with Next.js, Wagmi, and integrated with @inco/js.
• confidex-tee: NestJS-based backend running inside a Marlin Trusted Execution Environment (TEE).

🔑 Key Features

• 🫣 Confidential Trading - Supported by Inco's FHE capabalities
• 🕵️‍♂️ Confidential ERC20 Support – Encrypted tokens using @inco/lightning standard.
• 🔐 End-to-End Encrypted Intents – All trades are FHE-encrypted before submission.
• 🛡️ No MEV or Frontrunning – Mempool obfuscation via encrypted off-chain intent matching.
• ⚡ Low On-chain Footprint – Merkle trees compress state updates.

🛠️ How Confidex Is Built

Confidex extends SoloPatty by introducing confidential token support and encrypted matching logic for fully private trading.

🧠 Secure Execution & Order Matching

• Marlin TEE + NestJS – The backend listens to encrypted deposit events, decrypts using @inco/js within a TEE, matches trades, and signs off-chain updates.
  • Job ID: 0x0000000000000000000000000000000000000000000000000000000000000bca
  • IP Address: 43.204.7.162

🔗 Smart Contracts

• Solidity on Base Sepolia

  • Built using @inco/lightning and Inco’s ConfidentialERC20 standard
  • Manages encrypted token deposits, off-chain balance sync, and attested withdrawals

• OpenZeppelin – Leveraged ERC20, ECDSA, and MessageHashUtils

🖥️ Frontend

• Next.js + Wagmi + Viem + ShadCN + TailwindCSS
• Uses @inco/js to:
  • Encrypt amounts before deposit
  • Decrypt balances client-side for rendering
  • Handle encrypted withdrawal payloads

📜 Contracts Deployed

🔐 cUSDC Token

• Address: 0x1bc80bcc4fbb107fcf65d09e84d4c6ff5e0b9e7b
• BaseScan: https://sepolia.basescan.org/address/0x1bc80bcc4fbb107fcf65d09e84d4c6ff5e0b9e7b#code
• Description: ERC20 token with encrypted balances powered by Inco FHE

🔐 cCMF Token

• Address: 0x144481927c78798b5c38890c2e8e777de27dfc97
• BaseScan: https://sepolia.basescan.org/address/0x144481927c78798b5c38890c2e8e777de27dfc97#code
• Description: ERC20 token with encrypted balances powered by Inco FHE

🔄 Confidex Contract

• Address: 0x571f608851abf768f332233a43b6d54240cda01e
• BaseScan: https://sepolia.basescan.org/address/0x571f608851abf768f332233a43b6d54240cda01e#code
• Description: Orchestrates encrypted deposits, state attestations, and secure withdrawals with FHE

⚙️ How Confidex Works

1. User encrypts deposit amount via @inco/js and sends to smart contract
2. TEE decrypts using @inco/js, updates Merkle balance state
3. Users submit FHE-encrypted trade intents
4. TEE batch decrypts intents → matches via CoW algorithm → signs state root
5. User withdraws → encrypted withdrawal amount signed by TEE → contract verifies and releases tokens

🚫 Preventing MEV & Frontrunning

• 🔐 Encrypted Intents – No visibility to bots or external observers
• 🧠 TEE Matching – Private, deterministic, and tamper-resistant execution
• ✅ Attested Withdrawals – Enforces correctness with cryptographic proof

🧪 Hacky & Cool Innovations

• 🧬 First use of Inco’s ConfidentialERC20 in a working DEX
• 🔄 FHE Decryption/Encryption inside TEE using @inco/js
• 🌲 Merkle Tree compression of balance states
• 🔒 True full-stack encrypted DeFi system: UI → TEE → Chain

🚀 Getting Started

See individual submodule READMEs for setup and deployment instructions.

🤝 Contributing

We welcome contributions! Check out CONTRIBUTING.md for details.

📄 License

MIT – See LICENSE

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This project is under active development. Expect updates, enhancements, and cool new privacy features!