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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:

- 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.

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

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

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

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.

Changes to maximum order size for limit and market orders

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