You can also integrate CryptoNote with Ethereum or Tron blockchains natively, because CryptoNote and Tron use compatible address coding derived from Bitcoin and ERC20 is largely compatible with TRC20, but that doesn't mean there is no extra fees... As long as you use more than one blockchain, there is always a fee, if the blockchain itself has a transaction or node fee. Some blockchains allocate "resources", but those are just "prepaid" fees...