Interactive Brokers Algotrading

Knowledge base for building production-grade algorithmic trading systems with Interactive Brokers TWS API and ib_async in Python.

When to Use

Connecting to TWS or IB Gateway with ib_async
Implementing real-time market data subscriptions
Designing order execution logic (bracket orders, order lifecycle)
Handling pacing violations for historical data requests
Building reconnection resilience for 24/7 production bots
Deploying IB trading systems on Windows with IBC + Task Scheduler
Debugging TWS API error codes (110, 135, 162, 200, 201, 354, 366, 1100-1102)
Translating FX/metals symbols into the right contract type (spot vs CFD) for the account's entity
Sizing orders from prices without the NaN/0.0/unit/tick traps that silently mis-size or reject