This came up elsewhere in a thread where it was off topic so I thought I’d post this separately. It will also make it easier to find for anyone who is curious in the future.
I think I’ve worked out how the coin distribution works. There is a formula and I think it works off of the same logic that dictates how many ticks you get in offline Challenge missions. I’m pretty sure it works like this:
80% / 20% split (equivalent to Gold tick) You win and all your toons survive.
75% / 25% split (equivalent to Silver tick) You win, lose at least one toon but your team health is still >50%.
66% / 33% split (equivalent to Bronze tick) You win but don’t meet the criteria for Silver or Gold.
It is also possible to have a 50% / 50% split if you wipe each other out on the same turn; basically you kill the last enemy toon but then your last toon(s) die to a DoT.