System Availability | Interactive Brokers

Service Type	Downtime
Client Registration and Account Maintenance /gw/api/v1/accounts* /gw/api/v1/statements* /gw/api/v1/tax-documents* /gw/api/v1/enumerations*	Daily between 6pm ET–6:01pm ET. Sundays and Tuesdays between 6pm ET to 6:30pm ET
Funds and Banking /gw/api/v1/bank-instructions* /gw/api/v1/client-instructions* /gw/api/v1/instruction* /gw/api/v1/external-asset-transfers* /gw/api/v1/external-cash-transfers* /gw/api/v1/internal*	Daily between 11:45pm ET-12:30am ET Saturdays (any time), Sundays before 3PM ET

System Status: https://www.interactivebrokers.com/en/software/systemStatus.php

Rate Limiting

Interactive Brokers enforces a global request rate limit for the Account Management Web API:

10 requests per second per endpoint
600 requests per minute per master account (10 requests × 60 seconds)

Authentication Scope

Authentication for the Account Management API operates at the master account level, distinguishing it from the trading API’s user-level authentication structure.

Exceeding Rate Limits

If your application exceeds these established rate limits, the API will respond with a 429 HTTP status code (Too Many Requests).