Roadmaps are for corporations or scams. Denarius does not have a roadmap, though I do provide updates



Denarius uses the original Satoshi Bitcoin JSON RPC API. You can interface with denariusd with the RPC API. Any typical guide on Bitcoin RPC should give you a general idea of Denarius's RPC.

Some of the block explorers and coinmarketcap, etc. all offer APIs as well for market data etc.

I will eventually get a nicely written out guide of all the current commands, there are a few that Bitcoin does not support that Denarius does have such as smsg commands, stealth address commands, multisig commands, etc.