OKAPI is not online at oc.de for 2 reasons:
1) We need PHP 5.3. I prepared a new webserver to move some of the old content. However, until all runs from that new server, it will take some time. Maybe i can run OKAPI before migration is finished at all.
2) OKAPI requires some modifications to work with OC.de/OC.se/OC.nl code. My progress in this point is not very good, but solar22 also tries do work with OKAPI-code.