Stake Dice: RTP 99%, House Edge & Martingale Math

Stake Dice is a simple provably fair game: you pick a roll over or under a number (0–100), set a multiplier, and the game draws a random outcome. Win and you get (stake × multiplier); lose and you lose the stake. The house edge is fixed at 1% (RTP 99%), so on average you give back one cent per dollar wagered. Below we break down how that edge works, the maths behind long losing streaks (e.g. for Martingale), and why expected value stays negative no matter how you bet.

RTP 99% and House Edge 1%

RTP (Return to Player) is the long-term percentage of wagered money the game returns. 99% RTP means the house keeps 1% — the house edge. So for every $100 you roll, you expect to lose about $1 in the long run. Your win chance per roll depends on your target: e.g. "roll over 50" gives you about 49% win (50–100 range minus the edge). The multiplier is set so that (win chance × multiplier) = 0.99 — so your expected value per unit staked is −0.01. No matter what target or multiplier you choose, the edge is built in; you cannot get a positive EV.

Losing streaks and Martingale

In Martingale you double the stake after every loss. One win recovers previous losses and gives a small profit — but a long losing streak wipes the bankroll. With a ~49% win chance per roll (typical "over 50" style), the chance of losing n times in a row is about (0.51)^n. So 5 losses in a row: ~3.5%; 10 in a row: ~0.12%; 15 in a row: already in the "once in millions" range. The maths do not care about "I was due" — each roll is independent. Over many sessions, long streaks will happen; when they do, doubling stakes grows exponentially and hits table limits or your balance. Martingale does not change EV: you still lose 1% of total action in expectation; it only changes variance and the risk of a big bust.

Dice — probability of N losses in a row (win chance ~49% per roll)

Losses in a row	Approx. probability	Roughly once per
5	~3.5%	1 in 29 runs
8	~0.33%	1 in 300
10	~0.12%	1 in 830
12	~0.044%	1 in 2,300
15	~0.005%	1 in 20,000

Expected value in the long run: Regardless of strategy (flat bet, Martingale, or any progression), the house edge is 1%. So if you wager $10,000 in total over time, you expect to lose about $100. Progressions can create short-term swings and the illusion of "recovery," but they do not reduce the edge. Play for fun and set a loss limit; do not chase with Martingale thinking it beats the game.

Bottom line

Dice is 99% RTP, 1% house edge. Long losing streaks are rare but certain over enough rolls; Martingale does not fix EV and can bust you fast. Expect to lose about 1% of total wagered in the long run.