FairPlay Vault LogoFairPlay Vault
Commit–reveal on Base — no VRF required

Run provably-fair USDC pools on Base

Create time-boxed pools with flat entry pricing, optional dual-commit sentinel, and instant payouts. Simple for creators, transparent for players.

Create a PoolBrowse PoolsExplore Products & SDKOpen in Coinbase
Network
Base Mainnet
Currency
USDC (6 decimals)
Fairness
Commit–Reveal (+ optional sentinel)

Flat entry, instant payout

Everyone pays the same price per entry; winner is drawn and paid automatically after reveal.

No external VRF

Randomness comes from salts + blockhash. Add a sentinel for greater neutrality.

Clear timing

Entry and reveal windows enforce simple, predictable phases for all participants.

How it works

1
Create
  • Set entry price, windows & fees
  • Commit to a secret salt
  • Optionally add a sentinel
2
Enter
  • Players approve USDC once
  • Buy entries at a flat price
  • Wait for the deadline
3
Reveal & Draw
  • Creator (and sentinel) reveal salts
  • Contract draws a winner on-chain
  • Prize paid instantly
See full instructionsLearn more about Fairplay

Create a Pool

Works with your wallet on Base

Pool settings

Network: Base
Presets:

Basics

Core settings for your pool.
Entry price (USDC)i
Creator bond (USDC)i
Min entries (0 = none)i
Max entries (0 = unlimited)i

Windows

Entry and reveal timing.
Entry window
Selected: 30m
Reveal window (after entries close)
Selected: 10m
Sentinel reveal (if enabled)
Selected: 20m

Fees

These are fixed on the hosted app. SDK users can set their own.
Builder fee 2.00% i
Protocol fee 1.00% i
Prize & Fees Preview
i
Expected entries
Gross collected
50 USDC
Estimated prize (net)
48.5 USDC
Builder fee (200 bps)
1 USDC
Protocol fee (100 bps)
0.5 USDC
Developer? Use the FairplayVault SDK to set your own fee policy on your deployment.

Creator salt

Keep this safe. You’ll need it to reveal.
Secret salti
You can optionally encrypt this with a passphrase when creating the pool; we’ll also offer a local backup file.
Entry price: 1 USDCCreator bond: 50 USDCTotal to approve: 50 USDC
Allowance: 0 USDC
Step 1: Approve lets the vault transfer your bond(s). Step 2: Create submits the pool.
Tip: You can encrypt your creator salt on creation; we also offer a local backup file for safekeeping.

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