Bridge Aggregator

1. Introduction

HyperFlow’s Aggregator Bridge is an advanced cross-chain interoperability solution that enables seamless asset and data transfers across multiple blockchain networks. By integrating LayerZero (an omnichain messaging protocol) and Unit (assumed to be a Layer-0 or interoperability protocol), HyperFlow provides users and decentralized applications (dApps) with optimized routes for cross-chain transactions, prioritizing competitive rates, rapid delivery, and robust security. The aggregator bridge simplifies the complexity of interacting with various bridges, offering a unified interface for developers and end-users

1.1 Purpose:

The HyperFlow Aggregator Bridge addresses the challenges of blockchain fragmentation, including liquidity silos, high fees, and slow transaction times. By aggregating routes from LayerZero and Unit, HyperFlow ensures:

• Efficiency: Optimal routing based on cost, speed, and slippage.

• Scalability: Support for EVM and non-EVM chains, including Ethereum, Solana, and.

• Security: Robust validation mechanisms leveraging decentralized verifiers and immutable contracts.

• User Experience: A single interface for cross-chain swaps and transfers, reducing manual bridging steps.

1.2 Scope

This document covers:

• System architecture and components.

• Integration with LayerZero and Unit protocols.

• Transaction lifecycle for cross-chain transfers.

• Security and risk mitigation strategies.

• Developer integration guidelines.

• Example use cases and code snippets.

2. System Architecture:

HyperFlow’s Aggregator Bridge operates as a meta-layer that aggregates cross-chain routes from LayerZero and Unit, combining their strengths to provide a superior bridging experience. The architecture consists of off-chain and on-chain components, ensuring scalability and efficiency.

2.1 High-Level Architecture

User --> HyperFlow Contract --> LayerZero --> HyperFlow Contract --> User
          (Blockchain A)                       (HyperEVM)

User --> HyperFlow Contract --> Unit  --> HyperCore --> HyperEVM --> User
           (Other Chains)

User --> HyperFlow Contract --> HyperCore --> Unit --> User (Other Chains)
           (HyperEVM)

• User/dApp: Interacts with HyperFlow via a wallet (e.g., MetaMask) or API.

• HyperFlow Smart Contracts: On-chain logic for routing, execution, and settlement.

• LayerZero Routes: Leverages LayerZero’s omnichain messaging for fungible (OFT), non-fungible (ONFT), and arbitrary data (OApp) transfers.

• Unit Routes: Assumed to provide custom messaging or asset transfer capabilities, similar to LayerZero but with unique validation or chain support.

• Blockchains A & Other Chains: Source chains (e.g., Ethereum, Optimism, Base).

2.2 Components

2.2.1 Off-Chain Components

• Routing Engine: An off-chain algorithm that queries LayerZero and Unit routes, evaluating:

  • Cost: Gas fees and bridge fees.

  • Speed: Transaction finality time.

  • Slippage: Liquidity pool efficiency for swaps.

  • Security: Validator reliability and audit status. The engine returns a ranked list of routes, prioritizing user preferences (e.g., lowest cost or fastest delivery).

• Quote API: Provides real-time quotes for cross-chain transfers, accessible via REST or WebSocket.

• Monitoring Service: Tracks transaction status across LayerZero and Unit, ensuring reliability and fallback options.

2.2.2 On-Chain Components

• HyperFlow Aggregator Contract: The main smart contract that:

  • Receives user requests for cross-chain transfers.

  • Interacts with LayerZero Endpoints and Unit messaging contracts.

  • Executes multi-hop transactions (e.g., bridge + swap).

• Token Adapter Contracts: Handle token standards (e.g., ERC-20, OFT, HTS) for compatibility across chains.

• Fallback Contract: Manages failed transactions, allowing manual claiming of assets on the destination chain.

2.2.3 External Dependencies

• LayerZero Endpoints: Immutable smart contracts on each supported chain, handling message passing and validation.

• Unit Messaging Contracts: Assumed to be similar to LayerZero Endpoints, deployed on supported chains for custom message or asset transfers.

2.3 Supported Chains

HyperFlow supports multiple blockchain networks, including:

• EVM-Compatible: Ethereum, Arbitrum.

• Layer-2s and App-Chains: Optimism, Base, Hyperliquid (via LayerZero’s Hyperbridge).

3. Integration with LayerZero and Unit

3.1 LayerZero Integration

LayerZero is a permissionless, immutable messaging protocol that enables omnichain applications. HyperFlow leverages LayerZero’s core primitives:

• Omnichain Fungible Tokens (OFT): Allows fungible tokens (e.g., USDC, WETH) to move across chains with a unified supply via burn/mint or lock/unlock mechanisms.

• LzCompose function executes a composed message from the sender to the receiver. It provides the execution context (caller and extraData) to the receiver, allowing for additional validation.

How HyperFlow Uses LayerZero

• Swap (if needed) then

• Using OFT contracts to bridge tokens like USDT or WETH, ensuring seamless transfers.

• Use LzCompose to execute swap on destination chain

3.2 Unit Integration

Since "Unit" is not explicitly defined, the explanation assumes it refers to a Layer-0 or interoperability protocol with capabilities similar to LayerZero, potentially offering:

• Custom messaging for asset or data transfers.

• Support for unique chains or token standards not covered by LayerZero.

• Alternative validation mechanisms (e.g., hybrid or centralized validators).

Hypothetical Unit Features

• Messaging Contracts: Deployed on supported chains, similar to LayerZero Endpoints, for sending/receiving cross-chain messages.

• Validation Layer: Uses a hybrid model combining decentralized and centralized validators for cost efficiency.

• Token Standards: Supports custom token formats, potentially bridging non-standard assets (e.g., Cosmos-based tokens via IBC).

• Chain Support: Extends to niche or non-EVM chains not fully supported by LayerZero.

How HyperFlow Uses Unit

• Hybrid Validation: Unit’s validators provide an alternative to LayerZero’s DVNs, offering lower-cost options for low-value transfers.

• Token Bridging: HyperFlow uses Unit’s token transfer mechanisms for assets like IBC tokens or proprietary tokens. (e.g. UETH, UBTC, USOL (like LayerZero’s OFT)).

4. Transaction Lifecycle

The following describes the lifecycle of a cross-chain transfer using HyperFlow’s Aggregator Bridge, e.g., transferring 100 USDC from Ethereum to HyperEVM.

4.1 Steps

User Initiates Transfer:

• User connects a wallet (e.g., MetaMask) to HyperFlow’s UI.

• Specifies source chain (Ethereum), destination chain (HyperEVM), asset (USDC), and amount (100).

• Optionally sets preferences (e.g., prioritize speed).

Routing Engine Queries Routes:

• Queries LayerZero for OFT-based USDC transfer.

• Queries Unit for alternative USDC transfer routes.

• Returns options, e.g.:

  • LayerZero Route: $0.50 fee, 30s finality, high security.

  • Unit Route: $0.30 fee, 45s finality, medium security.

User Selects Route:

• User selects LayerZero route for higher security.

• HyperFlow’s UI generates a transaction payload.

1. Transaction Execution:

   • User signs a transaction to approve USDC spending for HyperFlow’s Aggregator Contract.

   • The contract calls LayerZero’s Endpoint to lock 100 USDC on Ethereum.

   • LayerZero’s Oracle and Relayer transmit the message to HyperEVM’s Endpoint.

   • DVNs validate the message, confirming the lock on Ethereum.

   • HyperEVM’s Endpoint mints 100 USDC (OFT) to the user’s wallet.

2. Settlement and Confirmation:

   • HyperFlow’s monitoring service tracks the transaction via LayerZero Scan.

   • User receives 100 USDC on HyperEVM within ~30 seconds.

5. Security Considerations

5.1 Security Features

• Immutable Contracts: HyperFlow’s core contracts, like LayerZero’s Endpoints, are non-upgradeable, reducing attack vectors.

• Security Inheritance: HyperFlow inherits robust security mechanisms from both LayerZero’s Decentralized Verifier Networks (DVNs) and Unit’s Guardian, ensuring decentralized and reliable transaction validation. DVNs are specifically utilized for LayerZero’s message verification, allowing configurable security per transaction, such as selecting multiple verifiers for high-value transfers.

• Decentralized Validation: LayerZero’s Relayers and Oracles operate independently, preventing collusion unless explicitly configured.

• Audits: HyperFlow is set to undergo audits by leading firms such as Trail of Bits, OpenZeppelin, or CertiK to ensure the highest security standards.

5.2 Risks and Mitigations

• Smart Contract Bugs:

  • Risk: Vulnerabilities in HyperFlow or integrated contracts.

  • Mitigation: Rigorous audits, bug bounties, and testnet deployments.

• Bridge Hacks:

  • Risk: Historical bridge exploits (e.g., Wormhole, Nomad) highlight vulnerabilities.

  • Mitigation: Use audited protocols (LayerZero, Unit) and diversify routes.

• Collusion in Unit’s Hybrid Validation:

  • Risk: If Unit uses centralized validators, collusion is possible.

  • Mitigation: Prioritize LayerZero for high-value transfers; limit Unit to low-risk transactions.

• Multi-Hop Failures:

  • Risk: Complex routes (e.g., bridge + swap) may fail mid-process.

  • Mitigation: Implement Fallback Contract for manual asset recovery.

6. Developer Integration (Coming soon)

7. Future Enhancements

• Sub-5-Second Finality: Collaborate with LayerZero and Unit to reduce cross-chain latency.

• More Chain Support: Expand to emerging chains

• Unified Liquidity Pools: Integrate with protocols like Stargate for deeper liquidity.

• AI-Powered Routing: Enhance the routing engine with machine learning for predictive optimization.

8. Conclusion

HyperFlow’s Aggregator Bridge, built on LayerZero and Unit, redefines cross-chain interoperability by offering unparalleled efficiency, security, and user experience. By aggregating routes from two robust protocols, HyperFlow ensures developers and users can navigate the fragmented blockchain ecosystem with ease. Whether bridging tokens, NFTs, or arbitrary data, HyperFlow delivers the best rates and fastest delivery, positioning itself as a leader in the Web3 interoperability landscape.