Pump

Think of 25 pumps with a set number of pops hidden among them, by difficulty. Each pump has its own number, which decides whether it is one of the pops that are left.

RTP: 98%
Max win: 3.2M×

Verify a Pump round Play Pump

How it works

How a Pump result is made.

Commit
We choose our server seed before you bet and show its fingerprint. This commits us to that seed.
The draw
Your seeds decide whether each pump is safe or pops. The remaining hidden pops determine the chance at each step.
Reveal
Rotate your seed to reveal ours. Use both seeds and the bet number to recheck any past result.

The whole formula

serverSeedOur seed, sealed until you rotate
clientSeedYour seed
nonceBet number, +1 each bet
roundExtra numbers, for games that need more

pump.tsTypeScript

1export function pumpRollFromFloat(float: number, remaining: number): number {
2  const raw = Math.floor(float * remaining);
3  if (!Number.isFinite(raw) || raw < 0) return 0;
4  return raw >= remaining ? remaining - 1 : raw;
5}

What it pays

Every outcome and what it pays.

Difficulty

Easy · 1 of 25 positions pop
Safe pumps	Chance to get there	Pays
1	96.00%	1.02×
2	92.00%	1.07×
3	88.00%	1.11×
4	84.00%	1.17×
5	80.00%	1.23×
6	76.00%	1.29×
7	72.00%	1.36×
8	68.00%	1.44×
9	64.00%	1.53×
10	60.00%	1.63×
11	56.00%	1.75×
12	52.00%	1.88×
13	48.00%	2.04×
14	44.00%	2.23×
15	40.00%	2.45×
16	36.00%	2.72×
17	32.00%	3.06×
18	28.00%	3.5×
19	24.00%	4.08×
20	20.00%	4.9×
21	16.00%	6.13×
22	12.00%	8.17×
23	8.00%	12.25×
24	4.00%	24.5×

RTP

Return to player.

Theoretical RTP: 98%.

The chance of surviving k pumps is:
P = C(25 − pops, k) / C(25, k)
Cashing out after k pumps pays:
multiplier = 0.98 × C(25, k) / C(25 − pops, k)

Test vectors

Fixed inputs, known results.

Reproduce these results with the inputs below.

Verify

Check a Pump round.

1export function pumpRollFromFloat(float: number, remaining: number): number { 2 const raw = Math.floor(float * remaining); 3 if (!Number.isFinite(raw) || raw < 0) return 0; 4 return raw >= remaining ? remaining - 1 : raw; 5}

Easy · 1 of 25 positions pop

Safe pumps

Chance to get there

Pays

96.00%

1.02×

92.00%

1.07×

88.00%

1.11×

84.00%

1.17×

80.00%

1.23×

76.00%

1.29×

72.00%

1.36×

68.00%

1.44×

64.00%

1.53×

60.00%

1.63×

56.00%

1.75×

52.00%

1.88×

48.00%

2.04×

44.00%

2.23×

40.00%

2.45×

36.00%

2.72×

32.00%

3.06×

28.00%

3.5×

24.00%

4.08×

20.00%

4.9×

16.00%

6.13×

12.00%

8.17×

8.00%

12.25×

4.00%

24.5×

How a Pump result is made.

Commit

The draw

Reveal

The whole formula

Every outcome and what it pays.

Return to player.

Fixed inputs, known results.

Vector 1The balloon pops on pump 4, after 3 safe pumps (up to 1.1136×).

Vector 2The balloon pops on pump 18, after 17 safe pumps (up to 40.25×).

Vector 3The balloon pops on pump 1.

Check a Pump round.

How a Pump result is made.

Commit

The draw

Reveal

The whole formula

Every outcome and what it pays.

Return to player.

Fixed inputs, known results.

Vector 1The balloon pops on pump 4, after 3 safe pumps (up to 1.1136×).

Vector 2The balloon pops on pump 18, after 17 safe pumps (up to 40.25×).

Vector 3The balloon pops on pump 1.

Check a Pump round.