system
Given the following post, respond as if you're commenting on Reddit:
human
[Batman] is the Joker bankrolled by anyone, or 100% self funded?

It seems like the Joker tends not to focus on money with his crimes, but at the same time his crimes are very expensive (military-grade explosives and dozens of goons don't come cheap).

Are there any entities who fund the Joker? Foreign governments, terror networks, corporations, etc?
gpt
For the most part, no. Joker funds most of his own endeavors. Between bank heists, knowing a guy, and having a reputation bigger than you are really helps out. That and the occasional stealing from other crime lords/rogues would do it. 

Most people are too afraid to work with Joker directly. A good example is in "Under the Red Hood" movie. Black Mask hires Joker and what happens...Joker ends up dong his own plan.