Every trading pair enforces a set of "trading parameters" when you place an order — for example, price and quantity precision. Understanding these parameters helps explain why some orders fail to submit, or why the system automatically "rounds" the price or quantity you entered to a different number.
What Are Trading Parameters
"Trading parameters" are a set of rules that every trading pair (e.g., BTC/USDT) must follow when placing an order. These rules aren't set arbitrarily by the platform — they're determined by the market rules of that specific trading pair. Different trading pairs and different markets may have different parameters, and these can change over time based on market conditions.
In short, trading parameters determine:
・The minimum quantity or amount you can buy or sell
・The maximum number of decimal places allowed for the price and quantity you enter
If an order doesn't comply with these rules, it's usually rejected outright rather than being matched in the market.
Common Trading Parameter Fields
Field | Meaning |
Quantity Precision | Limits the number of decimal places for the order quantity (must be an integer multiple of the smallest unit) |
Price Precision | Limits the number of decimal places for the order price (must be an integer multiple of the smallest unit) |
Note: Quantity and price precision may vary by trading pair — refer to what's actually displayed on your order page.
Why Trading Parameters Matter
Trading parameters directly determine whether an order can be successfully submitted:
・Amount too small: If your order amount is below the minimum order amount for that trading pair, the order cannot be submitted.
・Incorrect quantity or price precision: If the number of decimal places you entered exceeds what the system allows, it may automatically adjust the value (rounding up or down), or reject the order outright.
・Exceeding the limit: A small number of trading pairs impose a maximum quantity or amount per order; exceeding this also prevents submission.
This is also why the price or quantity you calculated may end up slightly different from the final result shown on screen after submission — the system is automatically adjusting the value according to that trading pair's precision rules, not making an error.
Common Scenarios Explained
・Order shows "quantity too small" / "insufficient amount":
Your order doesn't meet the minimum order quantity or minimum order amount for that trading pair. Try increasing the quantity or amount and resubmitting.
・The price or quantity you entered was automatically changed:
The number of decimal places you entered exceeded the precision allowed for that trading pair, so the system adjusted it automatically according to the rules.
・Limits differ across trading pairs:
This is normal — each trading pair's parameters are set independently and aren't standardized.