I have been a mentor at all 4 online UX boot camps (I have also taught at a few in-person boot camps). Below is a quick rundown of the different online programs as a mentor. Feel free to comment or send me a message if you have questions.
CareerFoundry (HQ in Berlin, Germany) - 10-month program online. As a mentor, you meet with students 1 to 3 times a week. You can mentor as little or as many people as you want. Mentor sessions are usually an hour and mentees are from all over the world. CareerFoundry has the students go in depth with the UX process with one project. After 6 months they can do 1-month specializations and then 3-months career prep. You only do the mentoring for the UX specific portion. There are also tutors who help with day-to-day questions in the Slack channel.
To be a mentor, you must have 5+ years of experience. Apply.
DesignLab's UX Academy (HQ in SF) - Offers a part-time program (7-months) and a full-time program (4-months).
They also do 4-week one-off classes, which is a good way to get your feet wet and try out the material. Meet with mentees one hour a week and review homework in-between. The homework has a rubric to work with. Can do as many or as few people as you want. The curriculum is based off of content from Stanford. Students do 3 to 4 projects after 3 months of the core curriculum. There are 6 briefs and they pick 4. The students do the full design process from research to visual design.
To be a mentor, you must have 3+ years of experience. Apply.
Bloc.io (HQ in SF) - 6-month online program, part-time for the students. The program includes UX, Visual Design, and front-end coding. You meet with mentees 1 hour a week. You can have as many or few as you want. You discuss questions about the work and curriculum. Bloc has Mentors, Graders, and Technical Coaches.
To be a mentor, you must have 1+ years of experience. Apply.
Springboard (HQ in SF) - 3-month online program. One project. Meet with mentees weekly for 30-minutes. Review homework and discuss curriculum during this time. You can have as many or as few mentees as you want.
To be a mentor, you must have 2+ years of experience. Apply.
Most places pay around $20/hr for mentoring.