Hi Spin,

direct market access is good, but alt coins have much and quick volatility therefore you should be on 24/7.
Because of lesser time and because of my non existing skills of manual trading I hoped for Zorro.

Poloniex has an API
https://poloniex.com/support/api/
(BTW: I have found some bots which trade on poloniex or other exchanges (gunbot, hassobot).)

crypto/crypto vs. crypto/fiat - because I live in the same country as you I need EUR in the end to pay my bills.

But on the other side I want to trade with the newer and smaller altcoins because the have more potential as the older and bigger ones. So I have no other choice as crypto/crypto.

Kind regards, Peter