OKX Perpetual Futures Orders Must Match the Contract Lot Size

Summary

This short forum post reports that OKX simulated API v5 perpetual futures orders were rejected when submitted with fractional quantities such as 0.126. The exchange response indicated that order quantity must be an integer multiple of the instrument’s lot size, explaining why the attempted orders failed.

The practical lesson is to check each contract’s lot-size rules and submit quantities that conform to them; a fractional amount is not necessarily a valid order increment. The post gives no instrument details, API documentation, or steps for retrieving the applicable lot size, so it does not establish that every OKX perpetual contract uses whole-number quantities. Verify the rule for the specific instrument and API environment before placing orders.

Key ideas

• OKX rejected the reported perpetual futures orders because their quantities did not meet the lot-size increment.
• The post describes the issue in a simulated API v5 environment.
• Order quantity increments may depend on the specific contract, so traders should verify the instrument’s lot-size rules.

Tags

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.