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stock-bot/docs/execution-services/broker-gateway/README.md

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Broker Gateway

Overview

The Broker Gateway service will provide a unified interface for connecting to multiple broker APIs and trading venues within the stock-bot platform. It will abstract the complexities of different broker systems, providing a standardized way to route orders, receive executions, and manage account information across multiple execution venues.

Planned Features

Broker Integration

  • Multi-broker Support: Connectivity to multiple brokerage platforms
  • Unified API: Standardized interface across different brokers
  • Credential Management: Secure handling of broker authentication
  • Connection Management: Monitoring and maintenance of broker connections
  • Error Handling: Standardized error processing across providers

Order Routing

  • Smart Routing: Intelligent selection of optimal execution venues
  • Route Optimization: Cost and execution quality-based routing decisions
  • Failover Routing: Automatic rerouting in case of broker issues
  • Split Orders: Distribution of large orders across multiple venues
  • Order Translation: Mapping platform orders to broker-specific formats

Account Management

  • Balance Tracking: Real-time account balance monitoring
  • Position Reconciliation: Verification of position data with brokers
  • Margin Calculation: Standardized margin requirement calculation
  • Account Limits: Enforcement of account-level trading restrictions
  • Multi-account Support: Management of multiple trading accounts

Market Access

  • Market Data Proxying: Standardized access to broker market data
  • Instrument Coverage: Management of tradable instrument universe
  • Trading Hours: Handling of exchange trading calendars
  • Fee Structure: Tracking of broker-specific fee models
  • Corporate Actions: Processing of splits, dividends, and other events

Planned Integration Points

Upstream Connections

  • Order Management System (for order routing)
  • Risk Guardian (for account risk monitoring)
  • Authentication Service (for user permissions)

Downstream Connections

  • External Broker APIs (e.g., Alpaca, Interactive Brokers)
  • Market Data Providers
  • Clearing Systems

Planned Technical Implementation

Technology Stack

  • Runtime: Node.js with TypeScript
  • Database: Fast key-value store for state management
  • Messaging: Message bus for order events
  • Authentication: Secure credential vault
  • Monitoring: Real-time connection monitoring

Architecture Pattern

  • Adapter pattern for broker integrations
  • Circuit breaker for fault tolerance
  • Rate limiting for API compliance
  • Idempotent operations for reliability

Development Guidelines

Broker Integration

  • API implementation requirements
  • Authentication methods
  • Error mapping standards
  • Testing requirements

Performance Considerations

  • Latency expectations
  • Throughput requirements
  • Resource utilization guidelines
  • Connection pooling recommendations

Reliability Measures

  • Retry strategies
  • Circuit breaker configurations
  • Monitoring requirements
  • Failover procedures

Implementation Roadmap

  1. Core integration with primary broker (Alpaca)
  2. Order routing and execution tracking
  3. Account management and position reconciliation
  4. Additional broker integrations
  5. Smart routing and optimization features