MXC now supports users to claim DOT mainnet asset, but mannual operation is required. The following is the tutorial on how to claim DOT: How to claim DOT on MXC
When the claim complete, the DOT asset will be arrived in your MXC account and trading is available. When the withdrawal service effective, users can withdraw the DOT asset, or choose to participate in Polkadot Staking for stable yield in the later stage.
Besides, MXC fully supports project with underlying technology. Polkadot is the representive of the cross-chain underlying infrastructure. MXC will apply to be one of the Polkadot node and initiate PoS Staking service in near future.