API Update: Introducing the 'minPrice' Field to the Instrument Endpoint

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, minPrice, will be added to the BitMEX Instrument table/endpoint. 

Effective Date and Time: 27 January 2026 at 06:00 - 09:00 UTC

What is changing?

A new field, minPrice, will be added to the response of the Instrument table (available via the /instrument REST API endpoint and WebSocket API).

For all current instruments, this field will be populated with the instrument's tickSize value, representing the smallest valid price for that contract.

Please refer to a snippet example of instrument in REST API or WebSocket API below:

"symbol": "XBTUSD",

"maxOrderQty": 10000000,

"minPrice": 0.1,

"maxPrice": 1000000.0,

"lotSize": 100,

"tickSize": 0.1

Why are we making this change?

The addition of the minPrice field complements the existing maxPrice field, providing a complete price range specification for contracts.

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.

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