You can use iq option ; http://iqoptions.co.uk
They have options for bitcoin prices as well if that's what you're looking for.
I think this and https://iqoption.com/ this are differents but found that iqoptions.co.uk doesn't have ssl certificate. They have options for bitcoin prices as well if that's what you're looking for.
I think better to try https://iqoption.com/ as i have heard this before also but haven't tried as i am not interested.
Found this : http://blog.iqoption.com/en/bitcoin-binary-options-trading-on-iq-option/
so yes they have bitcoin option also.
Yeah i think the one you linked is the correct one. Not to sure about the web based version because im using the Android based platform : https://play.google.com/store/apps/details?id=com.iqoption&hl=en
They're having some really bad reviews lately though but i didnt make any deposits so no harm done
