How to Play Event Contracts? Comparison of 4 Popular Platforms

What are Event Contracts?

An event contract poses a verifiable question and specifies the outcome options and settlement conditions in advance. Common structures include:

• Yes/No: For example, "Will a certain metric reach its target before a specified date?"

• Higher/Lower: Determining whether the expiration price is higher or lower than the entry price.

• Threshold: Assessing whether the final value is above, below, or not below a certain value.

• Multiple Outcomes: Setting multiple mutually exclusive outcomes for the same event, each quoted separately.

Participants trade the outcomes of the contracts. The contract terms usually specify the market question, deadline, time zone, official data sources, boundary values, handling of event cancellations or delays, and the payout amount for the winning contract. Markets with similar titles may also adopt different rules.

How Do Event Contracts Work?

• 1. Create Market: The platform defines the question, outcomes, trading deadline, and settlement source.
• 2. Form Quotes: The order book platform allows buyers and sellers to quote; products using automated market-making mechanisms form quotes based on market models, displaying participation amounts and return information before confirmation.
• 3. Establish Position: After an order is executed, participants hold a position in a certain outcome direction. Some platforms allow selling before the market closes, with the ability to execute depending on liquidity.
• 4. Stop Trading: The market stops accepting trades once the deadline is reached, the event starts, or other conditions set by the platform are met.
• 5. Confirm Results: The platform, exchange, or pre-designated oracle confirms the results based on the contract terms and data sources.
• 6. Complete Settlement: Binary contracts typically settle the winning side at $1 per share, while the losing side goes to zero; fixed-return products are calculated according to the rules locked in at confirmation.

What Does a Price of 70 Cents Represent?

In binary contracts priced between $0 and $1, the price is often interpreted as the market's implied probability. A "Yes" contract priced at $0.70 indicates that the current market pricing corresponds to a roughly 70% probability of occurrence.

If the final result is "Yes," each share typically pays out $1, resulting in a gross profit of $0.30 before fees and spreads; if the result is "No," the contract's value goes to zero, with a maximum loss of the invested $0.70.

Prices are influenced by new information, order book depth, bid-ask spreads, and participant supply and demand. The displayed 70% only reflects the market price at that moment and does not guarantee that the actual probability of the event is 70%. Products using automated market-making mechanisms also combine cycles, volatility, and risk parameters to form quotes and display return rates, so participants should check their principal, expected returns, and maximum potential losses simultaneously.

What Details to Look for in Settlement Rules?

• Settlement Data Source: Government agencies, event organizers, price indices, exchange data, or oracles may serve as the final basis.

• Comparison Symbols: "Above 100" usually requires strictly greater than 100; "100 or above" includes equal to 100.

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

• Exception Handling: How to handle event delays, cancellations, data corrections, price source interruptions, or long-term uncertainty of results.

• Dispute Process: Who can propose results, how long the objection period is, and who makes the final decision.

• Fees and Payouts: Transaction fees, platform commissions, on-chain fees, and withdrawal costs can all affect actual returns.

Platform Product Evaluation

Polymarket: Continuous Trading Event Market

Polymarket is a prediction market that continuously trades on event probabilities, forming prices through an order book and involving the UMA oracle in result confirmation.

• Specific Products: Primarily focused on Yes/No outcome shares, covering categories such as politics, macroeconomics, sports, crypto assets, and cultural events; markets usually continue until the event occurs and settlement is completed.

• Quotes: Utilizes an order book. The page probability typically shows the midpoint between the best bid and ask; when the bid-ask spread exceeds $0.10, the page switches to the most recent transaction price. The matching quotes for "Yes" and "No" total $1.

• Trading and Exiting: When the market is open and there are counterparties, results shares can be bought or sold through the order book. Limit orders can control execution prices, but may not exit at expected prices if liquidity is insufficient.

• Settlement: Handled by the UMA optimistic oracle according to the market's pre-announced rules. After results are proposed, there is a challenge period; each winning share pays out $1, while losing shares go to zero.

• Fees: The official current explanation states that some markets charge fees to the taker, while the maker is not charged; different market categories have different parameters, and the latest rates should be checked before entering.

Evaluation: Suitable for users who wish to continuously trade event probabilities, use limit orders, and focus on market depth. Key check items include rule wording, bid-ask spreads, on-chain wallets, oracle dispute processes, and regional availability.

Kalshi: Standardized Yes/No Event Contracts

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

• Specific Products: Primarily Yes/No contracts and threshold contracts, with each market listing clear rule summaries, expiration conditions, and result verification sources.

• Quotes: Utilizes an order book, with contract prices expressed in cents. A 70-cent "Yes" contract and a 30-cent "No" contract can form $1; the best bid, ask, and available quantity directly affect execution.

• Trading and Exiting: Positions can be established using the order book, and participants can exit through sell orders while the market is still open and liquidity exists. Unfilled limit orders can be canceled.

• Settlement: Each contract's terms specify the information and sources used. After expiration, Kalshi confirms results based on these terms; the official explanation states that settlement confirmation may take from one hour to over twelve hours after market close, depending on the data source.

• Fees: Transaction fees are calculated based on expected returns and other factors, and some markets may also charge fees to makers. Canceling unfilled limit orders is free, and actual fees should be checked on the market page before confirming orders.

Evaluation: Product terms and verification sources are clearly displayed, suitable for users who value standardized rules, order books, and the ability to exit early. The fee formula, market liquidity, and regional eligibility need to be verified separately.

Robinhood: Accessing Partner Exchanges Through a Familiar Interface

Robinhood is an entry point for event contracts through a familiar interface, with actual quotes, settlements, and special rules determined by the exchanges hosting the contracts.

• Specific Products: Robinhood's derivatives business offers event contracts through KalshiEX, ForecastEX, or Rothera Exchange and Clearing, commonly in forms such as single Yes/No, threshold contracts, and combined results.

• Quotes and Payouts: Individual prices typically range from $0.01 to $0.99, with correct results settling at $1 cash and incorrect results settling at $0. Prices and applicable fees are displayed before placing an order.

• Trading and Exiting: Unfilled orders can be canceled; once filled, they cannot be revoked. When the market is still open and there are buyers, positions can be sold at the current market price; if the market is closed or lacks liquidity, they must be held until settlement.

• Settlement: The final result is determined by the corresponding partner exchange based on the official data sources and terms specified in the contract, and Robinhood cannot change the settlement decisions of the exchange.

• Fees: May involve both exchange fees and Robinhood commissions, with specific amounts displayed on the order confirmation page.

Evaluation: Suitable for users already using Robinhood and valuing a unified operating interface. When reading terms, it is essential to confirm the actual exchange hosting the contracts, as settlements, fees, and special event rules are determined by the specific contract.

TurboFlow: A Chain-based Trading Ecosystem for Retail Investors

TurboFlow is a chain-based trading ecosystem aimed at global retail investors, integrating prediction markets and perpetual contracts, providing perpetual contracts, event contracts, and prediction markets on the same platform, and lowering the participation threshold for ordinary users through transparent execution and professional liquidity.

• Specific Products: This section evaluates TurboFlow's event contracts, specifically "Higher/Lower" contracts within a fixed time window. Users select the market, participation amount, cycle, and direction; the minimum participation amount is $2, and a round can be completed in as fast as 30 seconds, with real-time parameters based on the product page.

• Quotes and Participation: Automated market makers (propAMM) form quotes based on market, cycle, and risk parameters; before confirmation, they display entry price, participation amount, cycle, direction, return rate, and expected results, locking in the return rate after order confirmation.

• Settlement: The entry price is the price at which the order is accepted, and the settlement price is the price used at the contract's expiration. When choosing "Higher," the settlement price must be above the entry price to meet the direction; when choosing "Lower," the opposite is true. If both are the same, the principal is returned according to official rules.

• Position Management: Automatically settles after the countdown ends, with no need to manage margin, funding rates, or forced liquidation during the holding period; this mechanism differs from the platform's perpetual contract products.

Evaluation: TurboFlow targets retail investors, lowering the participation threshold for event contracts to a minimum of $2 and as fast as 30 seconds, while integrating perpetual contracts and prediction markets on the same platform. Short-cycle "Higher/Lower" contracts are more sensitive to entry timing, market volatility, and price data.

Core Differences

• Price Formation: Polymarket and Kalshi primarily rely on order books; Robinhood displays market quotes from partner exchanges; TurboFlow event contracts use automated market makers (propAMM) to form quotes, displaying entry price, participation amount, cycle, direction, and locking in return rates before confirmation.

• Time Span: Contracts from Polymarket, Kalshi, and Robinhood typically operate around event deadlines; TurboFlow event contracts use fixed time windows, completing a round in as fast as 30 seconds.

• Early Exit: The first three types of products can usually sell positions when the market is open and liquidity exists; TurboFlow event contracts focus on holding until the countdown ends and automatic settlement.

• Settlement Entities: Polymarket uses the UMA oracle; Kalshi confirms based on its own market terms and designated sources; Robinhood is determined by partner exchanges; TurboFlow event contracts settle automatically based on pre-disclosed contract rules, using trusted market data sources and multiple oracles to generate entry and settlement prices.

• Applicable Scenarios: Users focusing on continuously changing event probabilities may study Polymarket; those valuing standardized market rules may research Kalshi; users preferring Robinhood's unified interface can check its partner exchange contracts; those wishing to participate in short-cycle "Higher/Lower" contracts with low thresholds may explore TurboFlow event contracts.

Major Risks

• Principal Loss: If the direction is judged incorrectly, a single contract may go to zero, and fixed-return products may also lose the participation amount.

• Rule Risk: Ignoring boundary values, time zones, data sources, or exceptional clauses may lead to incorrect expectations regarding settlement results.

• Liquidity and Spread: Page probabilities, executable prices, and early exit prices may show significant discrepancies.

• Settlement and Data Risks: Delays in official data, corrections, oracle disputes, or price source anomalies may prolong settlement and trigger special rules.

• Fee Risks: Transaction fees, commissions, on-chain network fees, and deposit/withdrawal costs will reduce actual returns.

• Technical and Compliance Risks: Account security, smart contracts, platform operations, and regional restrictions may all affect product availability.

Conclusion

Understanding event contracts can be examined through the five stages of "defining the question --- forming prices --- trading exits --- confirming results --- settling funds." Polymarket, Kalshi, Robinhood, and TurboFlow event contracts adopt different product paths; among them, TurboFlow itself is a chain-based trading ecosystem integrating prediction markets and perpetual contracts, and this article only evaluates its event contract products. The platform name cannot replace the verification of individual contract terms, as the actual results are determined by the time, data sources, boundary conditions, and exceptional handling rules specified in the contract.