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Provably Fair · StakeVerify any Stake Pump round against its seed pair and confirm the pop point was fixed before you cashed out. A free, provably fair Pump verifier that reproduces the exact outcome from your server seed, client seed and nonce, in your browser.
Runs entirely in your browser - your seeds never leave this device.
Provably fair verification lets anyone independently recompute a game's result from its server seed, client seed and nonce - confirming the casino could not have altered the outcome after the bet. Browse all casinos & games
Stake Pump inflates a balloon for a rising multiplier, and you cash out before it pops. The pop point is not decided live - it is fixed from HMAC-SHA256 over your server seed, client seed and nonce before the round, much like Crash, and your difficulty setting changes how aggressively the pop probability rises.
Because the outcome is bound to the seed pair, the round is committed and reproducible. The hashed server seed is the casino's pre-commitment; once revealed on rotation, the pop point can be rebuilt and confirmed.
Higher difficulty means a higher pop chance per pump but bigger multiplier steps, while easier modes pump more often for smaller gains - all with a house edge around 1% and an RTP near 99%. Like Crash, the expected value is the same wherever you cash out; only the variance changes.
| Difficulty | Behaviour |
| Easy | Low pop chance per pump, small steps |
| Medium | Balanced pop chance and steps |
| Hard / Expert | High pop chance, large multiplier steps |
| Each pump | Independent fixed pop probability |
| House edge | ~1% (RTP ~99%) |
Pump is a Crash-style game where every cash-out point shares the same ~1% edge, so a cautious few-pump style and a greedy many-pump style have identical expected value and differ only in variance. The verifier proves a pop point was predetermined; it cannot tell you when the next balloon pops.
If you play, decide a cash-out target in pumps before the round and a session budget, and remember that harder difficulties pop early often. Read the difficulty table above as the real risk and avoid chasing a fast pop with a bigger bet.
Yes. The pop point is committed via HMAC-SHA256 of your seed pair and nonce before the round, and this verifier reproduces it from the revealed server seed.
No. The pop point needs the hidden server seed, so it cannot be known in advance. This tool only verifies completed rounds - any predictor is a scam.
Higher difficulty raises the pop probability per pump but increases the multiplier per step. The ~1% house edge stays the same across difficulties.
About a 1% edge and roughly 99% RTP, the same at every cash-out point - only the variance changes with difficulty.
It wins more often for smaller multipliers, but the expected value is identical to holding longer. Earlier cash-outs lower variance, not the edge.
Rotate seeds to reveal the server seed, paste it with your client seed and nonce above, and compare the reproduced pop point to your round.
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18+ only · Gamble responsibly · This tool verifies past results and cannot predict future outcomes.