We are working on the ability to support using OMG tokens to pay for gas on OMGX. Currently, it is still ETH and it takes work to make that change, but we’re working on it. In terms of whether you can call other contracts. Absolutely! OMGX is just a modified version of Ethereum. What you can do on L1, you can do on L2 as well. There are just a few opcodes that are not readily supported because those opcodes don’t have the equivalent concept on L2. But those changes are minor and they are covered by the porting guide that we have published on Github.