Unified Cross-Exchange Execution Layer¶

33.1 System Overview¶

The Unified Cross-Exchange Execution Layer enables true multi-account, multi-exchange, and cross-market trading from a single unified entry point. It provides professional-grade execution, intelligent order routing, synchronized trading, and risk management across all connected accounts and exchanges—empowering advanced arbitrage, hedging, and asset management strategies.

33.1.1 Core Objectives¶

• Unified Entry: Manage multiple accounts (e.g., multiple Binance, IB, HK brokers) and exchanges from one interface
• Intelligent Routing: Route orders to the optimal exchange based on fees, depth, and latency
• Synchronized Trading: Execute the same strategy across multiple accounts/exchanges in sync
• Position & Fund Sync: Synchronize balances, open orders, and positions across accounts
• Cross-Market Arbitrage: Enable true cross-market, cross-account arbitrage and risk management
• Professional Risk Control: Per-account and unified risk management

33.2 Architecture Design¶

33.2.1 Microservice Architecture¶

Unified Execution Center Service:

services/unified-execution-center/
├── src/
│   ├── main.py
│   ├── account/
│   │   ├── account_manager.py
│   ├── market/
│   │   ├── market_snapshot.py
│   ├── router/
│   │   ├── smart_order_router.py
│   ├── synchronizer/
│   │   ├── trade_synchronizer.py
│   ├── risk/
│   │   ├── account_risk_manager.py
│   ├── api/
│   │   ├── execution_api.py
│   ├── config.py
│   ├── requirements.txt
├── Dockerfile

33.2.2 Core Components¶

• Account Manager: Manages all exchange/broker connections and account states
• Market Snapshot Synchronizer: Standardizes and synchronizes market data from all exchanges
• Smart Order Router: Routes orders to the best venue based on cost, depth, and speed
• Trade Synchronizer: Ensures position and order sync across accounts after execution
• Account Risk Manager: Per-account and unified risk checks
• API Interface: Unified endpoints for order, cancel, amend, and sync
• Frontend Dashboard: Unified trading panel for all accounts and exchanges

33.3 Module Design¶

33.3.1 Account Manager (account_manager.py)¶

• Maintains all API connections and account states
• Supports crypto, US/HK stocks, and other brokers

class AccountManager:
    def __init__(self):
        self.accounts = {}
    def add_account(self, exchange_name, account_id, api_key, api_secret):
        self.accounts[(exchange_name, account_id)] = {
            "api_key": api_key,
            "api_secret": api_secret
        }
    def get_account(self, exchange_name, account_id):
        return self.accounts.get((exchange_name, account_id))

33.3.2 Market Snapshot Synchronizer (market_snapshot.py)¶

• Standardizes market data from all exchanges
• Provides unified snapshot interface

class MarketSnapshot:
    def fetch_snapshot(self, exchange_name, symbol):
        if exchange_name == "binance":
            return fetch_binance_snapshot(symbol)
        elif exchange_name == "okx":
            return fetch_okx_snapshot(symbol)
        elif exchange_name == "ib":
            return fetch_ib_snapshot(symbol)
        # ...

33.3.3 Smart Order Router (smart_order_router.py)¶

• Selects the best exchange for order execution based on cost, depth, and speed

class SmartOrderRouter:
    def route_order(self, symbol, side, quantity):
        candidates = fetch_all_exchange_snapshots(symbol)
        best_exchange = choose_best(candidates, side, quantity)
        return best_exchange

33.3.4 Trade Synchronizer (trade_synchronizer.py)¶

• Synchronizes positions and orders across accounts after execution

class TradeSynchronizer:
    def synchronize_trades(self, origin_account, target_accounts, executed_order):
        for acc in target_accounts:
            if acc != origin_account:
                self.replicate_order(acc, executed_order)

33.3.5 Account Risk Manager (account_risk_manager.py)¶

• Per-account and unified risk checks

class AccountRiskManager:
    def check_order_risk(self, account_id, order):
        # Check for over-leverage, forbidden trades, etc.
        ...

33.3.6 API Interface (execution_api.py)¶

• FastAPI endpoints for unified order, cancel, amend, and sync

from fastapi import APIRouter
router = APIRouter()
@router.post("/execution/unified_order")
async def unified_order(symbol: str, side: str, quantity: float):
    best_exchange = smart_router.route_order(symbol, side, quantity)
    return await order_service.place_order(best_exchange, symbol, side, quantity)

33.3.7 Frontend Dashboard¶

• Unified trading panel for all accounts and exchanges
• Shows balances, positions, order status, execution path, and cost optimization

33.4 Execution Flow Example¶

1. Strategy issues trade instruction → unified-execution-center routes to optimal exchange
2. Order executed on selected account/exchange
3. TradeSynchronizer updates other accounts for position sync
4. Unified risk and order management across all venues

33.5 Technology Stack¶

• Python (FastAPI, asyncio): Service implementation
• Exchange SDKs/APIs: Binance, OKX, IB, HK brokers, etc.
• Docker: Containerization
• React/TypeScript: Frontend dashboard
• Redis/Postgres: State and sync storage

33.6 API Design¶

• POST /execution/unified_order: Unified order placement
• POST /execution/unified_cancel: Unified cancel
• POST /execution/unified_amend: Unified amend
• GET /execution/account_status: Query account and position status
• GET /execution/sync_status: Query sync status

33.7 Frontend Integration¶

• Unified trading panel for all accounts and exchanges
• Real-time sync of balances, positions, and order status
• Visualization of execution path and cost optimization

33.8 Implementation Roadmap¶

• Phase 1: Account manager, market snapshot, basic order routing
• Phase 2: Trade synchronizer, risk manager, unified API
• Phase 3: Advanced sync, cross-market arbitrage, frontend dashboard

33.9 Integration with Existing System¶

• Integrates with strategy engine, risk center, and portfolio service
• Provides unified execution for all strategies and accounts

33.10 Business Value¶