Hey, I don't have too much experience in this field, but there is one company that came to my mind when I was reading your post. I came across this company few months back, it is called iqonic lab. It is German based, namely in Frankfurt (great location for crypto startup accelerator, as Frankfurt is touted as one of the major financial centres of Europe). Here is link, looks promising, you would have to see if it is what you are looking for. Good luck with that
https://iconiqlab.com/startups/