Hey there, almost a year, it took me a moment to remember the thread :) I've not looked at Ethereum support (Etherdelta has an API for trading), however many coins/blockchains are very similar. I wrote a quick block explorer for one coin, just for fun, in Mojolicious::Lite and Bitcoin::RPC::Client. It was limited to purely read only functionality (check address, transaction, block... display info)m ut there's nothing to stop you from full interaction. If I get time I'll tidy it up and post it. It still seems like you want some functionality a blockchain offers, without having to rely on the requirements of a crypto token. This seems possible, though the reality of running such a system could be cumbersome, depending on exactly what you wanted to do.