The only NFT Currency rarities that can be upgraded are Epics and Legendaries! Common, Uncommon and Rares cannot be upgraded but can be merged to form universal NFTs.

FXBOX traders can upgrade their NFT Currencies to increase the mining power rate and add bonus mining power with stars. All NFTs used up in the upgrading process are burnt as they are fed to the upgraded NFT Currency to increase stats. Read all about it below 

All NFT Currencies opened from boxes start at LVL 1. NFT Currencies can be leveled up to LVL 50 however, the current max level an NFT can reach is LVL 30. When upgrading your NFT Currencies, star bonuses can be acquired which generate a boost to your total mining power (without the star bonus).