HydraDX is a coin of cross-chain liquidity protocol built on substrate. HydraDX lives in a HydraDX blockchain in Polkadot ecosystem (parachain). The protocol's solution resolve liquidity issues. The total supply of HDX coins depends on liquidity provisioned.
You can find a ways how to get HydraDX (HDX) coins here:
You can stake HydraDX coin to gain passive income. The current APR is ~50%.