We're up to vault #8 on HiveHeist and the jackpot hasn't gone off yet, so we've started incrementally topping up the vault with supplemental Hive until it inevitably is won by someone.
Each guess is still 0.500 HIVE to enter and guess the 4 digit combination. Remember if you partially match the combination you can win back your entry amount in HIVE with payouts for different levels of combination guess.
Go enter vault #8 on HiveHeist, you might finally win it.