Changelog

• P&L information updated to include references to “Core” as a modelCode.

• SettledCashByDate has been added.

The TWS API content has been massively updated:

• Request, receive, and cancellation methods for the same behavior are now condensed to the same page.
• Guides have been updated to better indicate modern installation platforms
• Many URL paths have been shortened and clarified.
• “Introduction” sections have been renamed for clearer distinction. These were largely combined with limitations pages for clearer consolidation.
• Error Codes 2113 through 2189 have been added with descriptions of the error code.

• Updating the Python Interpreter has been consolidated to a single page
• Content in Updating the Python Interpreter has been updated with new media to better reflect the 1050.01+ install process.
• Install the TWS API on Windows has been updated to reflect the new 1050.01+ install process.

• The TWS API Event Trading section has been consolidated and streamlined for improved readability.
• Update to CME Event Contracts to reflect 0.01 USD increment of CME contracts.
• Update to our Avaialble Tick Types removing ticks 97 and 98 (ETF Nav High/ETF Nav Low).
• Updated detail of tick 99 indicating it is unique for NASDAQ ETFs rather than ETFs generally.

• The “Market Data: Delayed” section has been removed.
• The “Market Data: Historical” section has been removed.
• The “Market Data: Live” section has been removed.
• All TWS API market data content has been consolidated within the new “Market Data” section.
• Historical Date Format has been migrated to the TWS Settings section.

• A new Contract Reference tab has been added to the TWS API documentation. This section defines contract object structures for an array of security types and should be used as a reference for contract discovery.
• Update links on Request Watchlist Data
• Removed legacy “cancel” requirements for WhatIf documentation.

• All references to the legacy installers in interactivebrokers.github.io/ have been updated to reflect our new install page, https://download2.interactivebrokers.com/installers/tws-api/index.html
• The Sync API Documentation has been split from the API Documentation section. This change provides better clarity of behavior and function definitions.

• The TWS API Limitations page(s) have been updated to consolidate information and improve clarity in how the TWS and TWS API are related.
• The link to Trade Conditions has been removed from the Receive Tick By Tick Data page while the content is under internal review.
• Error Codes has been updated to include error code 0 and error code 10213 and their affiliated descriptions.
• Event Contract Example has been updated to include references for FORECASTX, KALSHI, and CME.
• Overnight Orders has been updated to better reflect trading the OVERNIGHT and OVERNIGHT+DAY trading sessions.
• Combo orders in Trigger Methods have been updated to use Bid/ask trigger type instead of Last as the default.

TWS API 10.49 has been released.

• TWS API 10.49+ is released under the GNU General Public License (GPL).
• While operating with Trader Workstation or IB Gateway 10.49.01 or greater, Settlement Type will be included in Contract Details.

A new update will be releasing a new TWS and API version on 2026-02-23. This update will contain a change where the Delayed_Last_Size (tick type 71) and Last_Size (tick type 5) returned to tickSize will now return a the size argument as a Decimal value rather than an Integer value as it had historically. This change is only going to roll out to users on the 10.44 and higher API version. Implementations below 10.44 will not observe any change.

TWS API 10.34.01 Release Notes:

• A new EClient.reqCurrentTimeInMillis() function has been added, allowing clients to request the current epoch timestamp reflected from Trader Workstation. This value will return over EWrapper.currentTimeInMillis() containing the integer, timeInMillis.
• The Order and Execution object now contains a “Submitter” field. The Submitter field returns the username that submitted a given order.

The TWS API has been updated to accommodate higher pacing limitations. As noted in our refreshed [Pacing Limitations]/(tws-api/doc/pacing-limitations/introduction) section, your maximum requests per second are now based on your Market Data Lines divided by 2.

Please be aware that Interactive Brokers will be increasing the minimum supported version of Trader Workstation and IB Gateway to 10.30 starting in March 20, 2025. Clients using lower versions will likely experience prompts to upgrade their machines or they will otherwise be restricted from access.

The Stable and Latest releases of TWS can be found on our website here.

TWS API 10.33 has several additional changes that should be reflected in coming upgrades:

• The [EWrapper.Error()]/(tws-api/doc/error-handling/receiving-error-messages) function has been updated in include a new parameter as the second argument, “errorTime”. This variable is a long value denoting the epoch timestamp of when the error was returned.
• The Order State source file now contains a new class object, [OrderAllocation]. The class includes information about client allocation for a given order and declares the position change for a client.
• The [OrderState] class has updated the margin fields to clarify “initMarginBeforeOutsideRth” or similar updates to the other fields to reflect changes based on market close. New values such as “rejectReason”, “orderAllocations” and “suggestedSize” are included to improve transparency.
• All instances referring to “commissions” have been updated to “commissionAndFees”
• The EClient.cancelOrder() function’s second argument is now an [OrderCancel object] in place of a string. This object takes an extOperator, manualOrderIndicator, and manualOrderCancelTime parameters.

Unique changelog pages have been created for each major section of the IBKR Campus API Documentation.

The ManualOrderIndicator fields have been added to the TWS API to comply with CME Rule 576.

Clearing members trading through CME must submit orders using these fields in order to maintain compliance with the exchange. Please be aware that Interactive Brokers cannot provide legal assistance with respect to which clients would or would not require this field.

Please be aware that endDateTime must be left as an empty string when requesting continuous futures contracts when using the TWS API with Trader Workstation or IB Gateway releases of 10.30 and above.

The TWS Settings Best Practices: Configure TWS / IB Gateway section has been added. This includes numerous quality of life settings applicable for the TWS or IB gateway that should be reviewed by regular users to potential help improve day-to-day trading.

ND Omni Accounts are now supported for use with the Trader Workstation/IB Gateway and TWS API along with the Web API.