There's a service I forgot where it was I saw it on here. You can sell them (in the form of having them do work in a sandbox) for some low amount of $ but still more than zero which is what you get without it.

I cant seem to find the project though.

It had a setup for contributing to open source with it too although you dont get paid.

1. grab a task list from the box 2. have you agent do it on the last subscription day 3. submit the PR or other work 4. get paid if not open source.