Chain Adapters

OnlyFence uses a chain adapter pattern to support multiple blockchains. Each adapter implements a common interface, making the core code chain-agnostic.

Interface

interface ChainAdapter {
  chain: string;
  getBalance(address: string): Promise<BalanceResult>;
  getTokenPrice(token: string): Promise<PriceResult>;
  getSwapQuote(params: SwapParams): Promise<SwapQuote>;
  buildSwapTx(quote: SwapQuote): Promise<TransactionData>;
  simulateTx(txData: TransactionData): Promise<SimulationResult>;
  signAndSubmit(txData: TransactionData, signer: Signer): Promise<TxResult>;
}

Sui Adapter

The Sui adapter is the current production adapter. It integrates with:

Component	Provider
Swap routing	7K Aggregator (best price across Cetus, DeepBook, Bluefin, FlowX, Turbos)
Lending	AlphaLend SDK
Price data	LP Pro
RPC	Sui fullnode
Key derivation	Ed25519 via m/44'/784'/0'/0'/0'

Planned Adapters

Chain	Key Derivation	DEX Integration
EVM (Ethereum, Base, Arbitrum)	secp256k1 m/44'/60'/0'/0/0	1inch, 0x
Solana	Ed25519 m/44'/501'/0'/0'	Jupiter

Design Principles

All code outside src/chain/ is chain-agnostic. This means:

• The policy engine, config system, CLI, TUI, and database work identically regardless of chain
• Adding a new chain requires implementing the ChainAdapter interface — no changes to core code
• Each adapter lives in its own directory under src/chain/

src/
  chain/
    sui/       # Sui adapter implementation
    evm/       # Future EVM adapter
    solana/    # Future Solana adapter
  core/        # Chain-agnostic pipeline
  policy/      # Chain-agnostic policy engine
  ...