How to play event contracts? A comparison of experiences across 4 popular platforms

What is an event contract?

An event contract proposes a verifiable question, and pre-defines the result options and settlement conditions. Common structures include:

• Yes/No: for example, “Whether a certain metric reaches the target before a specified date.”

• Higher/Lower: determine whether the expiry price is higher or lower than the entry price.

• Threshold type: determine whether the final value is above, below, or not below a specific number.

• Multiple-result type: the same event sets multiple mutually exclusive outcomes, with each outcome priced separately.

Participants trade the contract outcome. Contract terms typically specify the market question, cutoff time, time zone, official data source, boundary values, how to handle canceled or postponed events, and the payout amount for winning contracts. Markets with similar titles may use different rules.

How do event contracts work?

• 1. Create the market: the platform defines the question, outcomes, trading cutoff time, and settlement source.
• 2. Form quotes: the order book platform uses bids and asks; products using an automated market-making mechanism use an AMM model to form quotes, and display the participation amount and return information before confirmation.
• 3. Establish positions: after a trade matches, participants hold a position in a particular outcome direction. Some platforms allow selling before the market closes; whether a sale can be executed depends on liquidity.
• 4. Stop trading: once the cutoff time, the event start, or other platform-specified conditions are reached, the market stops accepting trades.
• 5. Confirm the result: the platform, exchange, or a pre-specified oracle confirms the result based on the contract terms and data source.
• 6. Complete settlement: binary contracts typically settle the winning side at $1 per contract, and the losing side goes to zero; fixed-payout products compute payouts based on the locked rules at the time of confirmation.

What does a price of 70 cents mean?

In binary contracts priced from $0 to $1, the price is often understood as the market-implied probability. If the “Yes” contract price is $0.70, it means the current market valuation roughly corresponds to a 70% chance of occurrence.

If the final outcome is “Yes,” each contract typically pays out $1, and the gross return (excluding fees and spread) is $0.30. If the outcome is “No,” the value of that contract becomes zero, and the maximum loss is the $0.70 paid in.

Prices are influenced by new information, order book depth, bid-ask spread, and supply and demand from participants. The displayed 70% only reflects the market price at that time; it does not guarantee the real-world probability is exactly 70%. Fixed-payout products using automated market-making mechanisms also form quotes using period, volatility, and risk parameters and display the return rate—participants should check, at the same time, the principal, expected return, and the maximum possible loss.

What settlement rule details should you check?

• Settlement data source: government agencies, event organizers, price indices, exchange data, or oracles can all become the final basis.

• Comparison symbols: “Higher than 100” usually requires strictly greater than 100; “100 or above” includes equality with 100.

• Time and time zone: which time point is used for settlement, which time zone, and whether the price sampling is an instant value, a closing value, or an average over a period.

• Exception handling: how cancellations, postponements, data corrections, price source outages, or cases where the result cannot be determined for a long time are handled.

• Dispute process: who can submit a result, how long the objection period is, and who makes the final decision.

• Fees and payout: trading fees, platform commissions, on-chain fees, and withdrawal costs all affect the actual return.

Platform product reviews

Polymarket: event markets with continuous trading

Polymarket is a prediction market where event probabilities are traded continuously. Prices are formed via the order book, and results are confirmed with UMA oracles.

• Specific products: mainly “Yes/No” outcome shares. Markets cover categories such as political, macro, sports, crypto assets, and cultural events; markets typically run until the event happens and settlement is completed.

• Quotes: uses the order book. The page’s probability usually displays the midpoint between the buy price and the sell price. When the bid-ask spread exceeds $0.10, the page switches to the most recent trade price. The matched pricing for “Yes” and “No” sums to $1.

• Trading and exit: when the market is open and there is a counterparty, you can buy or sell outcome shares through the order book. Limit orders can control the execution price; if liquidity is insufficient, you may not be able to exit at the expected price.

• Settlement: based on the rules announced in advance by the market, handled by UMA optimistic oracles. After a result is proposed, there is a challenge period. The final winning share pays $1 per contract, and losing shares go to zero.

• Fees: the official current note states that for some markets, fees are charged to takers (the ones who take liquidity), while makers (those who post orders) are not charged. Different market categories have different parameters, so you need to check the latest fee schedule before entering.

Review: suitable for users who want to trade continuously changing event probabilities, use limit orders, and care about market depth. The main checks are the rule wording, bid-ask spread, on-chain wallets, oracle dispute process, and regional availability.

Kalshi: standardized Yes/No event contracts

Kalshi is an event market centered on standardized Yes/No contracts, clearly defined market rules, and order book trading.

• Specific products: mainly Yes/No contracts and threshold contracts. Each market lists an explicit rules summary, expiration conditions, and the result validation source.

• Quotes: uses the order book; contract prices are shown in cents. A 70-cent “Yes” contract and a 30-cent “No” contract can combine to form $1. The best bid, best ask, and available tradable quantity directly affect execution.

• Trading and exit: you can use the order book to build positions, and exit via sell orders while the market is still open and liquidity exists. Unfilled posted orders can be canceled.

• Settlement: each contract’s terms specify the information and sources used. After the contract expires, Kalshi confirms the result based on these terms. The official note says settlement confirmation may be completed from one hour to more than twelve hours after the market closes, depending on the data source.

• Fees: trading fees are calculated based on factors such as expected profit, and some markets may also charge makers fees. Canceling unfilled posted orders is not charged; check the actual fees on the market page before confirming an order.

Review: contract terms and validation sources are displayed more clearly, suitable for users who value standardized rules, the order book, and the ability to exit early. You need to verify separately the fee formulas, market liquidity, and local eligibility.

Robinhood: an event contract entry via a familiar interface, accessing partner exchanges

Robinhood is an event contract entry point that connects to partner exchanges through a familiar interface. Actual pricing, settlement, and special rules are determined by the exchange that hosts the contracts.

• Specific products: Robinhood’s derivatives business provides event contracts through KalshiEX, ForecastEX, or Rothera Exchange and Clearing. Common formats include single Yes/No, threshold contracts, and combinations of outcomes.

• Quotes and payouts: the price per contract is typically between $0.01 and $0.99. Correct outcomes settle in $1 cash; incorrect outcomes settle in $0. Before placing an order, the price and applicable fees are displayed.

• Trading and exit: unfilled orders can be canceled; once filled, they cannot be withdrawn. When the market is still open and there is a buyer, you can sell your position at the current market price. If the market closes or liquidity is lacking, you need to hold until settlement.

• Settlement: the final result is determined by the corresponding partner exchange based on the official data source and terms specified in the contract. Robinhood cannot change the exchange’s settlement decision.

• Fees: may involve both exchange fees and Robinhood commissions; the exact amount is shown on the order confirmation page.

Review: suitable for users who already use Robinhood and value a unified操作 interface. When reading the terms, you need to confirm which specific exchange actually hosts the contract, because settlement, fees, and special event rules are determined by the specific contract.

TurboFlow: an on-chain trading ecosystem for retail users

TurboFlow is an on-chain trading ecosystem for global retail users that combines prediction markets with perpetual contracts. On the same platform, it offers perpetual contracts, event contracts, and prediction markets, using transparent execution and professional liquidity to lower the participation threshold for ordinary users.

• Specific products: this section reviews TurboFlow event contracts—i.e., Higher/Lower contracts within a fixed time window. Users choose the market, participation amount, period, and direction. The minimum participation amount is $2, and a round can be completed in as fast as 30 seconds. The real-time parameters follow the product page.

• Quotes and participation: an automated market maker (propAMM) forms quotes based on the market, period, and risk parameters. Before confirmation, it displays the entry price, participation amount, period, direction, return rate, and expected outcome. After confirming an order, the return rate for that contract is locked.

• Settlement: the entry price is the price when your order is accepted, and the settlement price is the price used when the contract expires. If you choose “Higher,” settlement price must be higher than the entry price to match the direction; if you choose “Lower,” it works the opposite way. If both are the same, the principal is returned according to the official rules.

• Position management: after the countdown ends, settlement happens automatically. During the holding period, there is no need to manage margin, funding rate, or liquidation. This mechanism is different from the platform’s perpetual contract products.

Review: TurboFlow targets retail users, lowering the participation threshold for event contracts to a minimum of $2 and as fast as 30 seconds, and integrates perpetual contracts and prediction markets on the same platform. The short-period Higher/Lower contracts are more sensitive to the entry timing, market volatility, and price data.

Key differences

• Price formation: Polymarket and Kalshi mainly rely on the order book; Robinhood shows market quotes from partner exchanges; TurboFlow event contracts use an automated market maker (propAMM) to form quotes and, before confirmation, display entry price, participation amount, period, direction, and the locked return rate.

• Time span: Polymarket, Kalshi, and Robinhood contracts usually run around the event cutoff time; TurboFlow event contracts use a fixed time window, with a cycle completed in as fast as 30 seconds.

• Early exit: for the first three product types, when the market is open and there is liquidity, you can usually sell your position. TurboFlow event contracts’ public process focuses on holding until the countdown ends and automatic settlement.

• Settlement counterparty: Polymarket uses UMA oracles; Kalshi confirms based on its own market terms and specified sources; Robinhood is determined by the partner exchange; TurboFlow event contracts auto-settle based on the pre-disclosed contract rules, using a trusted market data source and entry and settlement prices generated by multiple oracles.

• Applicable scenarios: if you care about continuously changing event probabilities, focus on Polymarket; if you value standardized market rules, consider Kalshi; if you prefer a unified interface on Robinhood, check its partner exchange contracts; if you want to participate with a low threshold in short-period Higher/Lower contracts, consider TurboFlow event contracts.

Main risks

• Principal loss: if your directional judgment is wrong, a single contract may go to zero; fixed-payout products may also lose the participation amount.

• Rule risk: ignoring boundary values, time zones, data sources, or exception clauses can lead to incorrect expectations of settlement outcomes.

• Liquidity and spread: the probabilities shown on the page, tradable prices, and early-exit prices may differ significantly.

• Settlement and data risk: official data delays, corrections, oracle disputes, or abnormal price sources may extend settlement and trigger special rules.

• Fee risk: trading fees, commissions, on-chain network fees, and in/out fees reduce the actual return.

• Technical and compliance risk: account security, smart contracts, platform operations, and regional restrictions can all affect product availability.

Summary

To understand event contracts, you can check through five steps: “question definition—price formation—trading exit—result confirmation—fund settlement.” Polymarket, Kalshi, Robinhood, and TurboFlow event contracts use different product paths. Among them, TurboFlow itself is an on-chain trading ecosystem that merges prediction markets with perpetual contracts, and this article only reviews its event contract product. A platform name cannot replace verifying the terms of a specific contract. What truly determines the outcome is the time, data source, boundary conditions, and exception handling rules written in the contract.