Onyx, also referred to as the XCN Ledger, is a highly scalable Layer 3 blockchain network that is architected for performance, security, and cost efficiency. It is deployed using the Arbitrum Orbit stack and benefits from the robust security foundation of Coinbase’s Base Layer 2 blockchain. This unique architecture enables Onyx to inherit the modular scalability of Arbitrum while maintaining the security assurances provided by Base, offering an optimized environment for developers building next-generation decentralized applications (dApps).

Onyx is fully Ethereum Virtual Machine (EVM) compatible, allowing seamless deployment of smart contracts and interoperability with existing Ethereum-based applications and tooling. Developers can build and deploy decentralized finance (DeFi) protocols, payment solutions, governance frameworks, and other blockchain-based services while leveraging Onyx’s high throughput and low transaction costs.

With an institutional-grade infrastructure, Onyx is designed to support large-scale applications and enterprise adoption, ensuring high availability, robust security mechanisms, and scalability optimizations.

The Onyx Documentation Hub is the central resource for institutions and developers looking to build, integrate, and leverage the full potential of Onyx This comprehensive documentation provides in-depth technical details, architecture specifications, and implementation guidelines for developers aiming to utilize Onyx’s blockchain infrastructure efficiently.

Beyond just technical references, this hub serves as a developer-centric knowledge base, offering code samples, API references, SDK integration guides, and best practices for optimizing smart contract deployments and blockchain interactions. Whether you are designing custom dApps, implementing scalable payment systems, or integrating Onyx into multi-chain architectures, the documentation provides a structured approach to understanding transaction finality, network security, gas optimizations, and governance mechanisms within the Onyx ecosystem.

By leveraging the resources provided, institutions and developers can streamline development workflows, enhance security practices, and maximize the performance of their blockchain-based applications on Onyx.

Quick Start Below:

This section provides essential technical details regarding Onyx’s publicly available Remote Procedure Call (RPC) endpoints, allowing developers to interact with the Onyx blockchain network. These RPC endpoints facilitate smart contract deployments, transaction broadcasting, data querying, and state synchronization with the Onyx blockchain. Developers and infrastructure providers can integrate these endpoints into their applications, wallets, or blockchain indexing services to ensure seamless interaction with the Onyx network.

Public RPC Endpoints

Onyx provides both HTTPS and WebSocket (WSS) RPC endpoints, enabling developers to connect to the network for executing transactions and retrieving blockchain state data. The WebSocket endpoint is particularly useful for applications requiring real-time event subscriptions, such as monitoring contract events or transaction confirmations. The available endpoints are:

Additional Network Resources

To enhance blockchain interaction and facilitate development on Onyx, the following key resources are available:

Network Parameters

Below are the specific network parameters for Onyx:

The following smart contract addresses are integral to the Onyx blockchain infrastructure. These addresses correspond to core protocol contracts and token bridge contracts, which facilitate transaction processing, cross-chain interoperability, and protocol governance. Developers building on Onyx should reference these addresses for contract interactions, cross-chain asset transfers, and network-specific implementations.

Layer 1 Governance & Staking

The smart contracts for Onyx on Ethereum are below:

Layer 3 Core Protocol Contracts

The core smart contracts of Onyx define the network’s fundamental operations, including transaction finalization, message passing, and state synchronization.

Token Bridge Contracts

The Token Bridge Contracts enable seamless asset transfers between Onyx and external networks. These contracts are responsible for asset locking, minting, and validation in both Layer 2 (L2) and Layer 3 (L3) environments.

L2 Token Bridge Contracts:

L3 Token Bridge Contracts