IG is offering an interesting REST API and a huge variety of instruments (https://labs.ig.com/)

Well, IG? Many, on internet report issues with them...
http://www.forexpeacearmy.com/forex-reviews/109/www.ig.com

I have no own experience with IG and I am not affiliated with them, so I cannot and do not want to comment on their quality/integrity - but the API and the # of tradable instruments seem interesting for automation. They also have binary options and might be at least one of the less dubious binary options brokers out there that could be used for the system described by jcl (http://www.financial-hacker.com/binary-options-scam-or-opportunity/).

If you have difficulties withdrawing your money, all the positive things you mentioned should be put under a different light. Do not you think so?

I would like to see this as well.

I have an IG account and I've never had any issues with them. The few times I've been in contact with their support they´ve been really quick to answer. I've played around a bit with the API and I find it to be pretty easy to use. Only used it through their Java client though.