The base rate for trading fees on Metal Pay is 2% for all sales, and purchases of coins other than BTC, MTL, XPR and USDC.
BTC has a 1% fee for buying.
MTL, XPR and USDC have 0% fees for buying.
Holding Metal (MTL) gives you a fee reduction when buying and selling cryptocurrency in proportion to your in-app MTL balance:
If you hold 2,500 MTL you'll get a 0.25% trading fee discount.
If you hold 5,000 MTL you'll get a 0.50% trading fee discount.
If you hold 10,000 MTL you'll pay 0% trade fees.