Changes to maximum order size for limit and market orders

We’re updating the rules for maximum order sizes on Spot and Margin trades. Right now, limit and market orders share the same limits. Starting Oct 16, 2025, new rules will take effect to improve trading efficiency and support more flexible strategies:

- Removing the maximum order value limit

- Separating the maximum order size for limit and market orders

Limit and market orders within the same Spot and Margin pair will have independent maximum sizes:

- The maximum size for limit orders will stay the same, which is the same as the current maximum order size

- The maximum size for market orders will be set at half of the limit order size

For post-only and retail price improvement (RPI) orders, the maximum size will be 5 times the limit order size.

API updates

Orders that exceed the maximum size will return new error codes “170381” and “170382”. The previous error code “kEcSpotQtyTooHigh = 170135” will no longer apply.

To check order limits, use get/v5/market/instruments info and set “Spot” as the category. The affected fields are maxOrderQty and maxOrderAmt.

For detailed parameters of each trading pair, please refer to the [Spot trading rules](https://www.bybit.com/en/announcement-info/spot-trading-rules).

What you can do

To avoid potential issues with placing or executing orders under the updated rules, we recommend all users review these changes and adjust their trading strategies before Oct 16, 2025.