Currency options, just as its name implies, it refers to the holders enjoy the COINS rights and interests of a certain period, namely a currency options=1 BTC, but its cost is lower than the spot price a lot, a options need only twenty or thirty dollars, but it with a currency spot to enjoy the rights and interests is consistent,

For example, in the currency when $16000
Buy a BTC spot, cost $16000
Buy one currency call option, the cost $20

When the currency from $16000 to $17000 more than
1 spot BTC earned $1000
One option is still earned $1000

Both earnings, but as long as the option comes at a cost to the $20, 800 points is a currency spot, one of which is option, asymmetric risk is limited, gains the characteristics of the infinite, but it is important to note that the option characteristic of BitOffer American options here, its zero fees, zero margin, without blowing up mechanism, can be liquidated at any time, and not as a European option, only due to unwind,