BMX is an ERC20 based token issued by BitMart Exchange with total volume of 1,000,000,000. First issued as BMC in December 2017, BitMart changed the name of the token in January 2018 as BMX. You may find that the symbol name displayed in the smart contract and block explorer as BMC, but the actual symbol name we use is BMX. The reason is: our toke was named BMC, but then we find that 'BMC' has been used by another project, so we have to change the symbol name of our token to 'BMX'.
Plutons are digital tokens issued to users on the Ethereum blockchain, these are native to the Plutus app. To provide an analogy, these tokens are similar to cash back or frequent flier miles. As a user, you will automatically be rewarded with a 3%* rebate in Plutons for every Bitcoin deposit you make towards a purchase. Plutons can be used within the Plutus app in the same way as Bitcoins. This means that you can use Plutons to charge your contactless balance just as you would with BTC, with the added benefit of zero fees and instant conversions.