MX is the proof of rights and interests of MXC trading platform itself. Its total circulation is 3 billion constantly and never be added. MX holders can enjoy a series of rights and interests including asset appreciation, rebates on platform revenue, supervision, voting, etc. MX can be obtained in two ways: mining and buying.
The SALT platform is meant to facilitate getting a loan, where the company holds your cryptocoins as collateral while you don't pay back the loan.