Spot

To enhance trading flexibility and improve transparency for Post-only and Retail Price Improvement (RPI) orders, Bybit is updating Spot Trading Rules with the introduction of a new configuration field: PostOnlyMaxLimitOrderSize.

Previously, Post-only and RPI orders were identified using a fixed 5x multiplier applied to the maximum limit order size. This fixed rule has now been replaced with a more precise, trading-pair-specific configuration.

- Each trading pair will now have its own defined PostOnlyMaxLimitOrderSize, replacing the universal 5x multiplier.

- This enhancement allows for more accurate control of liquidity provision across different markets.

- Endpoint Updated: GET /v5/market/instruments-info and GET /v5/account/instruments-info ,set “Spot” as the category

- The response now includes a new field, PostOnlyMaxLimitOrderSize, which enables API users to query Post-only size limits for each trading pair.

[Spot Trading Rules](https://www.bybit.com/en/announcement-info/spot-trading-rules/)

[Help Center – Spot Trading Rules](https://www.bybit.com/en/help-center/article/Bybit-Spot-Trading-Rules#B)

[API Documentation](https://bybit-exchange.github.io/docs/v5/error)

Introduction of PostOnlyMaxLimitOrderSize for Spot Trading Rules

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