Architecture Overview: System Chain Standard

Understand the modular architecture and design principles behind Apex SDK as the System Chain Standard Library for Polkadot Asset Hub, Revive, and PolkaVM/Solidity.

System Design

Apex SDK is a modular, protocol-agnostic library for building system chain applications. The design prioritizes:

• High-level Asset Hub APIs (assets, NFTs, balances)
• Native Revive protocol integration
• PolkaVM/Solidity contract management
• Unified account, transaction, and chain operations

High-Level Architecture

graph TB
    subgraph "Application Layer"
        A[System Chain dApp]
        B[CLI Tools]
        C[Web Frontend]
    end
    subgraph "Apex SDK Core"
        D[AssetManager]
        E[ReviveAdapter]
        F[ContractManager]
        G[Account]
    end
    subgraph "Chain Integrations"
        H[Asset Hub]
        I[Revive Protocol]
        J[PolkaVM/Solidity]
    end
    A --> D
    A --> E
    A --> F
    D --> H
    E --> I
    F --> J

Core Components

• AssetManager — Asset Hub API (assets, NFTs, balances)
• ReviveAdapter — Revive protocol integration
• ContractManager — PolkaVM/Solidity contract deployment/calls
• Account — Unified account abstraction

Transaction Management

Unified transaction API for assets, NFTs, and contracts:

let tx_hash = asset_mgr.transfer(asset_id, from, to, amount).await?;
let contract_result = contract.call_method("transfer", &[recipient, amount]).await?;

Revive Protocol

Native asset recovery and migration:

let result = revive.recover_asset(account_id, asset_id).await?;

PolkaVM/Solidity Contracts

Deploy and interact with Solidity contracts on Asset Hub:

let contract = ContractManager::deploy(&bytecode, ContractConfig::default(), &deployer_account).await?;
let result = contract.call_method("transfer", &[recipient, amount]).await?;

Best Practices

• Use async/await for all chain operations
• Modularize dApp logic using AssetManager, ReviveAdapter, ContractManager
• Follow Security Recommendations for key management

Next Steps

• Quick Start
• API Reference
• Revive & PolkaVM Guide
• Installation Guide

Ready to build the future of system chain applications?