Pacing Limitations
Interactive Brokers currently enforces a global request rate limit of 10 requests per second for each authenticated username — that is, each Web API session.
Additionally, some endpoints are also subject to their own pacing limits as described in the table below.
When a rate limit is exceeded, the Web API will return a 429 Too Many Requests status code.
Violator IP addresses may be put in a penalty box for 10 minutes. After this period, the IP address is removed from the penalty box. Repeat violator IP addresses may be permanently blocked until the issue is resolved.