A grade is the said value of a Nexon customer, and is measured by how much NX you have purchased. This grade acts as a restriction to who may enter the Black Market Server at any one time. This restriction is subject to change. The grade changes as the player buys more and more NX. The grade is based on a cumulative amount of NX purchased by the player.
Common Grade (The Player has not bought NX)
Copper Grade (The Player has bought any amount of NX under $50)
Bronze Grade (The Player has bought limited amounts of NX. It takes at least $50 to reach this grade.)
Silver Grade (The Player has bought a moderate amount of NX. It takes $100 to reach this grade.)
Gold Grade (The Player has bought $500 worth of NX.)
Platinum Grade (The Player has bought at least $700 worth of NX)
Diamond Grade (The Player has bought at least $5000 worth of NX)