50% of trading fees paid on Ethfinex go into a pool for the holders of Nectar tokens (NEC).
By adding limit orders onto the order book, which are later matched and executed, you earn NEC tokens, distributed every 30 days.
The total number of NEC created each period depends on the amount of trading fees paid during that month. Each period the rate decreases according to the equation:
issued_nectar = fees_paid * 1000 * (2 - totalSupply / initialSupply) ^ 2
Each 30-days as the totalSupply increases the rate therefore decreases.
Find out more on the Ethfinex blog at blog.ethfinex.com or log into your account at ethfinex.com/nectar
More information to monitor statistics about the Nectar token are available at https://nectar.community