I started playing around with the youtube api to find just that. They only give you so many free search credits so you have to be careful with which calls you make. And in what order. I found the best way is to search for keywords like:

https://github.com/andrewarrow/many-possible-worlds/blob/mai...

then call get channel from the channel_id returned in the search:

https://github.com/andrewarrow/many-possible-worlds/blob/mai...