Spank Bank slot: RTP and max win
Spank Bank is a high-volatility slot by After Hours Studios on Stake Engine, released 13 Oct 2026. Its base game returns 96.70%, above the median Engine slot (96.02%) and higher than 86% of them. The top payout is 25,000× the bet, bigger than 81% of Engine slots; from a base spin it lands about once every 3,117,912 spins. It has 5 bonus buys priced at 100× to 2,000× the bet; the best returns 96.70%, so each buy costs 3.30× the bet on average over the long run. It is the No. 368 most played Engine slot over the last 30 days.
Every mode, side by side
Costs are multiples of the base bet. Odds come from the published outcome table for v4. "Returns the cost" counts rounds that pay back at least what the mode cost. Expected cost is cost × (1 − RTP): the average amount lost per round over the long run.
| Mode | Type | Cost | RTP | Max win | Max win odds | Pays anything | Returns the cost | Expected cost per round | |
|---|---|---|---|---|---|---|---|---|---|
| Base | Base spin | 1.00× | 96.70% | 25,000× | 1 in 3,117,912 | 1 in 3.00 | 1 in 7.67 | 0.03× base | Simulate |
| Bonus Enhancer | Boosted spin | 3.00× | 96.70% | 25,000× | 1 in 747,960 | 1 in 2.91 | 1 in 24 | 0.10× base | Simulate |
| Thick And Rich | Bonus buy | 100× | 96.70% | 25,000× | 1 in 39,841 | every round | 1 in 5.38 | 3.30× base | Simulate |
| Coin Shot | Bonus buy | 300× | 96.70% | 25,000× | 1 in 1,500 | 1 in 5.00 | 1 in 7.41 | 9.90× base | Simulate |
| Dirty Coins | Bonus buy | 300× | 96.70% | 25,000× | 1 in 12,453 | every round | 1 in 4.40 | 9.90× base | Simulate |
| Mystery | Bonus buy | 500× | 96.70% | 25,000× | 1 in 750 | 1 in 2.50 | 1 in 7.48 | 16.50× base | Simulate |
| Max Win Spins | Bonus buy | 2,000× | 96.70% | 25,000× | 1 in 13 | 1 in 13 | 1 in 13 | 66.00× base | Simulate |
Version history
Base-mode RTP per published math version. Older versions stay public in the fairness API, so changes can be checked.
| Version | Base RTP | |
|---|---|---|
| v4 | 96.700% | Active |
Frequently asked
What is the RTP of Spank Bank?
Base spins return 96.70% of the amount wagered over the long run, from the published outcome table for version 4. All 5 of its bonus buys return 96.70%.
What is the max win in Spank Bank and how likely is it?
The top payout is 25,000× the base bet. On a base spin it lands 1 in 3,117,912 spins. In the Thick And Rich buy (100×) 25,000× lands 1 in 39,841 buys.
Does Spank Bank have a bonus buy, and what does it cost?
Yes, 5 buy modes. Thick And Rich: 100× the base bet, 96.70% RTP, an expected cost of 3.30× the base bet per buy. Coin Shot: 300× the base bet, 96.70% RTP, an expected cost of 9.90× the base bet per buy. Dirty Coins: 300× the base bet, 96.70% RTP, an expected cost of 9.90× the base bet per buy. Mystery: 500× the base bet, 96.70% RTP, an expected cost of 16.50× the base bet per buy. Max Win Spins: 2,000× the base bet, 96.70% RTP, an expected cost of 66.00× the base bet per buy.
Is Spank Bank high or low volatility?
High. Its base-mode standard deviation is 31.9× the bet, which puts it in the highest third of Engine games. What volatility means.
Can I check that a result was fair?
Yes. Engine games use provably fair seeds. Once your server seed is revealed you can replay any round against the published outcome table. See how to verify a result.
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