Where do I even begin with Arbiquant (spiegel-de.com)? since the beginning of the year of broken promises, unanswered tickets, and a platform that feels like it was built in 2010. They spend more on marketing than on actually improving their service. Stay away from this company.
Pros: API access|Dedicated account manager|Risk management tools|Copy trading available
Cons: Wait times can be long during peak hours