The Universal Token is a coin that has the ability to turn into any value of any currency that the user wants. Princess B'Onangutan gives it to Finn in the episode "Water Park Prank" after he saves her from a cluster of Daddy Sad Heads. Finn decides to try and use it in the Wet Pipes Water Park locker room for his locker, but it ends up hitting a drain, splitting into a handful of various coins, and then falling through the cracks.
It appears to be a black hexagon with a hallow question mark in the middle. It has glowing red and blue stripes all over it's sides.
- This coin is used as a comic relief scenario in the episode because the coin has the power to be any value and yet Finn chooses to make it worth a cent, even though he doesn't have to, as Jake had brought two regular coins.