Although Interactive Brokers offers our clients high quality market data, IB is not a specialised market data provider and as such it is forced to put in place severe restrictions to limit traffic which is not directly associated to trading. A Pacing Violation1 occurs whenever one or more of the following restrictions is not observed:
Note that when BID_ASK historical data is requested, each request is counted twice. In a nutshell, the information above can simply be put as "do not request too much data too quick".
Important: the above limitations apply to all our clients and it is not possible to overcome them. If your trading strategy's market data requirements are not met by our market data services please consider contacting a specialised provider.
A step size is defined as the ratio between the historical data request's duration period and its granularity (i.e. bar size). Historical Data requests need to be assembled in such a way that only a few thousand bars are returned at a time. The following table exemplifies this concept:
|Duration||Allowed Bar Sizes|
|60 S||1 sec - 1 mins|
|120 S||1 sec - 2 mins|
|1800 S (30 mins)||1 sec - 30 mins|
|3600 S (1 hr)||5 secs - 1 hr|
|14400 S (4hr)||10 secs - 3 hrs|
|28800 S (8 hrs)||30 secs - 8 hrs|
|1 D||1 min - 1 day|
|2 D||2 mins - 1 day|
|1 W||3 mins - 1 week|
|1 M||30 mins - 1 month|
|1 Y||1 day - 1 month|
The minimum expected historical data availability for stocks is one year, and depends on the user's maximum Market Data Lines :
|Years of Historical Data||Lines required||Required monthly commissions||Required monthly equity||Booster packs|
|One year||0 - 499||Less than USD 4000||Less Then USD 5,000,000||0|
|Two years||500 - 749||USD 4,000||USD 5,000,000||4|
|Three years||750 - 999||USD 6,000||USD 7,500,000||7|
|Four years||1000 - 1249||USD 8,000||USD 10,000,000||9|
|Five years||1250 - 1499||USD 10,000||USD 12,500,000||N/A (1)|
(1) The maximum number of Quote Booster packs per user name is 10.
1. At this time Historical Data Limitations for barSize = "1 mins" and greater have been lifted. However, please use caution when requesting large amounts of historical data or sending historical data requests too frequently. Though IB has lifted the "hard" limit, we still implement a "soft" slow to load-balance client requests vs. server response. Requesting too much historical data can lead to throttling and eventual disconnect of the API client.