API Update: Introducing execCommCcy in executions
At BitMEX, we are committed to continually improving our platform and its infrastructure to support advanced trading capabilities for our users. As part of this ongoing effort, we are announcing an update to our REST and WebSocket APIs.
From 27 January 2026, a new field, execCommCcy, will be added to the BitMEX Execution response.
Effective Date and Time: 27 January 2026 at 06:00 – 09:00 UTC
What is changing?
A new field, execCommCcy, will be added to the Execution response (available via the /execution and /order REST API endpoint and WebSocket API). It will explicitly show the currency the execComm is denominated in.
Please refer to a snippet example in the REST API or WebSocket API below:
/execution
"execID":"2e8f42c4-1b86-291b-c371-87a2c503b1a8",
"orderID": "2e8f42c4-1b86-291b-c371-899999999998",
"account": 1234567,
"symbol":"XBTUSDT",
"execComm":1800,
"execCommCcy":"XBt"
Why are we making this change?
We are adding an explicit field to provide future flexibility for the fee settlement system.
This is an additive change, meaning it introduces a new field without removing any existing data. Most integrations should be unaffected.
If you have any questions about these upcoming changes, please contact Support.
To be the first to know about our new listings, product launches, giveaways and more, we invite you to join one of our online communities and connect with other traders. For the absolute latest, you can also follow us on Twitter, or read our blog and site announcements.
BitMEX Blog
