I trade futures in a different country. I pay $1.5 for 1 contract of corns, and 1 contract=10tons of corns. I will only pay 1 way fee, if I close the trade within 1 day. I wonder if 1 contract in US or UK market is 10 tons or 100 tons. It seems Agriculture (Pit/Floor Traded) USD 6.00 USD 6.00 USD 12.00 by IB is much higher than what I got.