The minimum order size goes by base currency (base currency is the left currency in each pair - e.g. XBT is the base currency in the pair XBT/USD). The order minimums for each base currency are as follows:
- Augur (REP): 0.3
- Bitcoin (XBT): 0.002
- Bitcoin Cash (BCH): 0.002
- Dash (DASH): 0.03
- Dogecoin (DOGE): 3000
- EOS (EOS): 3
- Ethereum (ETH): 0.02
- Ethereum Classic (ETC): 0.3
- Gnosis (GNO): 0.03
- Iconomi (ICN): 2
- Litecoin (LTC): 0.1
- Melon (MLN): 0.1
- Monero (XMR): 0.1
- Ripple (XRP): 30
- Stellar Lumens (XLM): 300
- Zcash (ZEC): 0.03
- Tether (USDT): 5
Examples: If you are trading XBT the volume of the order must be at least 0.002 XBT or larger. If you are trading ETH the volume of the order must be at least 0.02 ETH or larger.