Prediction market on manifold. If AI wipes out humanity, this resolves YES if mana still has any value, and NO if it doesn't. Since by definition I won't be around to handle resolution, I'll leave the details of determining that to whoever is, but one suggested procedure could be to attempt to barter mana for resources/social status and resolve YES if any successful trade is made (no matter how poor the exchange rate). I volunteer any remaining mana in my account to be used for this purpose, if needed. If AI doesn't wipe out humanity, this resolves N/A at close. To the haters who say "if this resolves NO then by definition it will be worthless to the winners"... well, let's just not think about that too hard.
Liquidity: $1,000. Resolves: 1/2/2040.