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Every spot order is checked against the rules of its market before it’s accepted. An order that breaks any rule is not created — the platform blocks it at submission, so it never enters the order book or your Order History. If you’re unable to place an order, one of the rules below is the most likely reason. This page lists the rules and the current values for each spot market.

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Order Validation Rules

Market orders aren’t subject to a placement rule for slippage — they execute immediately, with a protective cap on spend. See Market-order slippage tolerance below.

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Spot Market Specifications

Prices and amounts accept up to 8 decimal places, but must still align to the tick size (price) and step size (amount) below.
All spot markets currently apply a ±25% price band on limit and trigger orders — the price must stay within 25% of the current market price, so the allowed range moves with the market.

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Market-order slippage tolerance

A market order executes immediately at the best available prices, so its average fill price can differ from the submission price. A market buy keeps your total spend within about 5% of the expected amount; if the price moves further, the order fills only up to that limit. Market sells are unaffected, since they lock the exact amount you’re selling.

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Worked Examples

You place a limit buy on ETHUSDT at 2,000.005. The tick size is 0.01, so the price must end at a multiple of 0.01 (e.g. 2,000.00 or 2,000.01). You won’t be able to place it — round your price to the tick size and try again.
You try to sell 0.0005 ETH. The minimum order size on ETHUSDT is 0.001 and the step size is 0.001, so 0.0005 is both too small and not a valid increment. Use 0.001, 0.002, and so on.
You place a buy on YELLOWUSDT for 3 YELLOW at 0.50 USDT — an order value of 1.5 USDT. The minimum notional is 5 USDT, so the order can’t be placed. Increase the amount or price so the total value is at least 5 USDT.
With ETH trading around 3,000 USDT, you place a limit buy at 2,200. That’s more than 25% below the reference price (the floor is 3,000 × 0.75 = 2,250), so it’s blocked. Place your limit price within 25% of the current price — between 2,250 and 3,750 in this example.