Order Limits and Price Bands


Order Limits

  1. Can’t send orders more than 2% (for futures markets) or 25% (for spot markets) through opposite side of the book 
    1. Orders too far through the book get their prices capped at the limit price
    2. Market orders have the same price cap applied -- this means that it's possible to get partially filled on a market order if liquidity is low relative to the size of the order
  2. Sum of open order sizes per side can’t be greater than max($1m, 1% of an ADV of the underlying coin) x (5 if the future is a perpetual, else 1).
  3. Can’t increase position if OMF < IMF after the order is placed
  4. Can’t send any orders (including orders that would decrease position) if account is below MMF (maintenance margin fraction)


Price Bands

  1. FTX also has price bands.  On derivative markets users can’t send orders if either:
    1. Price is more than:
      • 10% from the mean Mark Price (MP) over the past 5 minutes if the futures' underlying is one of BTC, ETH, USDT, EOS, BCH, XRP, BNB, BSV, LEO, TRX, or ALT.
      • 20% from the mean Mark Price (MP) over the past 5 minutes otherwise
    2. Absolute value of premium is more than 5% above the absolute value of the mean premium over the past 5 minutes
  2. For spot markets, users will not be able to submit an order if the price is more than 20% from our approximate fair value, defined as (base currency / quote currency) using the prices from our index when applicable. Cryptocurrencies that we do not maintain an index for, the relevant FTX market price (median of bid, ask, last) will be used. 


ADV: 30-day volume / 30 24h before the contract first trades


Minimum Size

Minimum BTC-PERP Provide Size:

The minimum provide (maker) size for BTC-Perp is 0.01, this only applies when you make more than 10 orders per hour smaller than 0.01. 

Minimum RUNE-PERP Provide Size:

The minimum provide (maker) size for RUNE-Perp is 1, this only applies when you make more than 10 orders per hour smaller than 0.01. 

Limit orders sent that are larger than the market's quantity step but smaller than its minimum provide size are automatically turned into IOC orders.

This restriction is only applied at placement time, and only for the first 10 orders per hour (rolling). If a limit order is successfully placed, and then gets partially filled such that some amount under the minimum provide size is left, then that order remains out; the rest doesn't get cancelled.

If an account has a position whose size is smaller than the minimum provide size, reduce-only limit orders will still be rounded down to that size and successfully placed.


Clamping to step sizes

If an input size or price is not divisible by the market's size step or tick size, respectively, then we do not reject the order: we round the input, conservatively:

- Size gets rounded down to the nearest size step increment

- Price gets rounded up (if selling) or down (of buying) to the nearest price increment





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