Compare · Polymarket
Predict Bay™ and Polymarket are both prediction markets, and they are not competing for the same trade. Polymarket is an event-market venue on Polygon covering elections, sports, macro releases and other real-world questions. Predict Bay is a short-duration price venue on Sui: a strike is set at the open, you pick above or below, and the round resolves against an on-chain price feed.
Pick by the shape of the question first. “Who wins the election” and “where is BTC in an hour” are different instruments with different resolution problems, and no single venue design is good at both.
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Practice mode · no wallet, no deposit, free to start
Compared on design, not on size. The maturity difference in the last row is the one that matters most: Polymarket is live with real money, and Predict Bay is not.
| Dimension | Polymarket | Predict Bay |
|---|---|---|
| Primary market type | Event and outcome markets: elections, sports, macro, plus crypto questions | Short-duration price markets on BTC, ETH, SUI, gold, oil |
| Chain | Polygon | Sui, via DeepBook Predict — the integration targets that protocol’s testnet deployment |
| Instrument | Binary outcome shares under a conditional-token framework, collateralised in USDC | Binary options: an expiry plus a strike as a price tick. Sentinel ticks give one-sided above-X / below-X contracts; a bounded pair gives a range |
| Where the book lives | Central limit order book with off-chain matching and non-custodial on-chain settlement | DeepBook, Sui’s native on-chain CLOB, is the book DeepBook Predict sits alongside. Positions are minted, held and redeemed entirely on-chain |
| Resolution | Optimistic oracle: a proposer asserts the outcome against a bond, a challenge window runs, disputes escalate to a token-holder vote | On-chain oracle price at expiry. Oracle feeds for the underlying, alongside spot, forward and volatility-surface feeds published on Sui |
| Typical duration | Days to months, set by the event | Minutes to a day, on a fixed UTC schedule |
| Onboarding | Crypto wallet | Google sign-in via zkLogin — no seed phrase — with sponsored transactions. Connecting a Sui wallet directly is also supported |
| Live with real money | Yes | No. Sui is testnet and switched off for real funds; Polygon real-money trading is paused. Practice mode is what is tradeable today |
An optimistic oracle is a social mechanism wearing a smart contract. Someone proposes the outcome and posts a bond, a challenge window opens, and if nobody disputes within the window the proposal settles. A dispute escalates to a vote of the oracle's token holders, and whichever side is wrong forfeits its bond. It is elegant because it costs almost nothing in the common case, and it is the only mechanism that can settle a question no data feed publishes — which is exactly why an event venue needs one.
A price-feed oracle inverts every one of those properties. DeepBook Predict settles against its on-chain oracle price at expiry: the contract reads the feed, the payoff is arithmetic, and the holder redeems. Nobody proposes anything, there is no window, and there is no vote. The cost is that it only works when a canonical price exists, and it moves the trust question onto the feed — its update cadence, how it aggregates across publishers, and how the contract handles a stale update at the settlement instant.
The practical consequence is simple: an hourly round can only exist on the second design. A challenge window measured in hours cannot resolve a market measured in hours.
If the question you want to trade is a real-world event, use an event venue — that is what the optimistic-oracle design is for, and Predict Bay does not list those markets. If the question is a short-horizon crypto price, a price-feed venue settles it without an adjudication step, and Predict Bay is built around that one shape.
And if you want to try Predict Bay today, understand what you are trying: practice mode, with simulated balances, on the real markets and the real feeds. The longer version of this comparison is in Predict Bay vs Polymarket.
Practice mode needs no funding and no wallet setup — a round takes about a minute to understand. The home page runs a playable demo before you sign in at all.
Prediction markets carry risk and you can lose the full amount you commit to a position. Nothing on this page is financial advice, and nothing here is an offer to buy or sell anything. See the risk disclaimer and the Terms of Service before trading.
Last updated 2026-07-31.