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Masayume on your phone

Call it in ten seconds.

Will Bitcoin be higher or lower when the Window closes? Pick a side, pick a stake, and the payout lands in your wallet the moment it settles. Test funds on Somnia testnet, real settlement, and only you can cash out.

  • Web appinstalls from the browser, no store
  • Somnia testnetpractice money, real mechanics
  • Nativenot built — the web app is the product
Masayume on a phone: a Bitcoin Window with the live price, the time left, the Up and Down calls, and the stake.

Connect and go

Any EVM wallet, through RainbowKit. The faucet hands you test collateral, and there is nothing else to install.

Windows all day

New BTC and ETH Windows open every few minutes. Take one on the walk to work, or sit one out.

Paid on the close

Settlement reads the same oracle print you watched. Win and it is yours to claim — nobody else can.

Masayume runs on Somnia testnet while it is in beta, so you are playing with practice funds. Everything else is real: real markets, real settlement, real code.