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Storm Vault: upgrade your bet in USDC — pick a multiplier, see the chance

Storm Vault is an all-or-nothing game: you choose how many times to multiply your bet (from 1.20× to 1000×) and see the exact chance right away: 96% divided by the multiplier. 2× is 48%, 10× is 9.6%. One click and you have the result. Won? Press Upgrade again and risk the win once more. RTP is 96% at any multiplier.

Play Storm VaultFree demo
Storm Vault game screen in the X3NA app: game field, recent results and bet panel
Storm Vault as it looks in the X3NA app.

How to play

  1. Enter a bet, from $0.10.

  2. Pick a multiplier or an item from the vault: from Spark Shard (1.20×) to the X3NA Crown (500×+). The chance is calculated for you.

  3. Press Upgrade. The reel stops in the win zone or misses; the result takes a couple of seconds.

Odds and payouts

MultiplierChance1 in N upgradesItemRarity
1.20×80.00%1.25Spark ShardSpark
2.00×48.00%2.08Volt DaggerCharge
5.00×19.20%5.21Surge BladeSurge
10.00×9.60%10.4Tempest AxeTempest
50.00×1.92%52.1Thunder HammerThunder
100.00×0.960%104Stormcaller MaskThunder
500.00×0.192%521X3NA CrownMythic

Why it is fair

The server takes a number k: the first 4 bytes of HMAC-SHA256 (key: server seed, message: client seed:nonce:0). You win if k × multiplier × 100 < 96 × 2³². Example: def / abc / 1 → k = 1 849 153 629 → 2.22× wins, 2.23× does not. Check it in the verifier. The formula is in Provably fair.

Chains and risk

Upgrade again stakes the whole win again. The chance of passing a chain of three 2× in a row is 0.48³ = 11%. The longer the chain, the likelier you lose everything. Each upgrade's RTP is 96%; no betting system changes that.

Limits

Bet$0.10 – $12.50
Multiplier1.20× – 1000×
Withdrawalfrom 10 USDC
NetworkBase, USDC

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FAQ

What is a bet upgrade?

You risk your bet for M times the amount. The win chance is 96% / M: the bigger the multiplier, the smaller the chance.

What are items and rarities?

They are the multiplier's skin: from Spark Shard (1.20×) to the X3NA Crown (500×+). The win arrives in USDC on your balance.

What is Upgrade again?

A button after a win: the next upgrade goes straight on the whole amount you just won.

How do I verify a result?

Copy the server seed, client seed and nonce from your bet history and paste them into the verifier. It shows the number k and the outcome.

Can I play for free?

Yes, in the demo with no wallet.

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