Getting started
What is Granbay?
Updated 4/29/2026
Granbay is a prediction market platform. You buy and sell shares in real-world outcomes — politics, sports, crypto, culture — and the share price reflects the probability the market assigns to that outcome.
How it works
Each market has two outcomes (YES / NO) priced between 1¢ and 99¢. The price is the implied probability — a YES at 65¢ means the market thinks there's a 65% chance of YES.
When the market resolves, every YES share pays out 100¢ if the outcome happened, 0¢ if it didn't. The same applies to NO in mirror.
Closed beta
Granbay is currently in closed beta on virtual cash. You get a R$1,000 virtual balance at signup. Real-money operations are gated behind the Sprint 11/12 validation gate — see the BETA banner at the top of every page.