EXMR is the official token of GetCryptoPayments® gateway, and its main function of this payment gateway will be to integrate a wide universe of currencies and tokens through a competition, with the acquisition of Ethereum Monero for that purpose. The online merchants and the local store can receive payments on most cryptocurrencies, safely and quickly with a low rate. This payment gateway will allow retailers worldwide to accept payments in Ethereum Monero, Bitcoin, Ethereum, Litecoin, and altcoins. There will be no fees for payments made in EXMR.
ARPA is a Secure Computation Network Compatible With Blockchains They propose a blockchain-based secure computation network of Multi-party Computation (MPC). ARPA cryptographically enables private smart contract, unprecedented data-at-use privacy protection, as well as scalable computational sharding.