An event contract turns a future outcome into a contract with defined terms that can be traded and settled according to preset rules. Products may be based on major events, economic data, sports, weather, or crypto-asset prices. When evaluating a platform, focus on six factors: the contract question, pricing method, expiration time, early-exit options, settlement source, and fees.

What Is an Event Contract?

An event contract asks a verifiable question and defines the possible outcomes and settlement conditions in advance. Common structures include:

• Yes/No: For example, “Will a specified indicator reach a target by a given date?”
• Higher/Lower: Predict whether the settlement price will be higher or lower than the entry price.
• Threshold: Predict whether the final value will be above, below, or at least a specified level.
• Multi-outcome: A single event has several mutually exclusive outcomes, each quoted separately.

Participants trade outcome positions. Contract terms typically specify the market question, deadline, time zone, official data source, boundary conditions, treatment of cancellations or postponements, and the payout for a winning contract. Markets with similar titles may still use different rules.

How Do Event Contracts Work?

• 1. Market creation: The platform defines the question, outcomes, trading deadline, and settlement source.
• 2. Quote formation: On order-book platforms, buyers and sellers submit prices. Products using automated market making generate quotes through a pricing model and display the stake and return information before confirmation.
• 3. Position opening: Once an order is filled, the participant holds a position in a particular outcome. Some platforms allow positions to be sold before the market closes, subject to available liquidity.
• 4. Trading close: The market stops accepting trades when the deadline is reached, the event begins, or another condition specified by the platform is met.
• 5. Outcome determination: The platform, exchange, or designated oracle determines the outcome using the contract terms and specified data source.
• 6. Settlement: Binary contracts typically pay $1 per winning share while losing shares settle at zero. Fixed-return products settle according to the terms locked in at confirmation.

Pricing: What Does 70 Cents Mean?

In a binary contract quoted between $0 and $1, the price is often interpreted as the market-implied probability. A Yes contract priced at $0.70 indicates that the market price roughly corresponds to a 70% probability at that moment.

If the final outcome is Yes, each share typically pays $1, producing a gross profit of $0.30 before fees and spread. If the outcome is No, the share settles at zero and the maximum loss is the $0.70 paid.

Prices are affected by new information, order-book depth, bid-ask spreads, and participant supply and demand. A displayed probability of 70% reflects the market price at that time; it does not guarantee that the event’s true probability is 70%. Fixed-return products using automated market making may also incorporate duration, volatility, and risk parameters when generating quotes and displaying return rates. Participants should review the stake, projected return, and maximum possible loss together.

What Should You Check in the Settlement Rules?

• Settlement source: Government agencies, sports organizations, price indexes, exchange data, or oracles may serve as the final authority.
• Comparison language: “Above 100” generally requires a value strictly greater than 100, while “100 or above” includes 100.
• Time and time zone: Check the settlement timestamp and time zone, and whether the price is an instantaneous value, a closing value, or an average over a specified period.
• Exceptional events: Review how postponements, cancellations, data corrections, price-source outages, or outcomes that remain indeterminate are handled.
• Dispute process: Check who may propose an outcome, how long the challenge period lasts, and who makes the final decision.
• Fees and payout: Trading fees, platform commissions, on-chain costs, and withdrawal fees can all reduce the actual return.

Platform Product Review

Polymarket: A Continuously Traded Event Market

Polymarket is a prediction market for continuously trading event probabilities. Prices are formed through an order book, and the UMA oracle participates in outcome resolution.

• Product: Markets primarily use Yes/No outcome shares and cover politics, macroeconomics, sports, crypto assets, culture, and other categories. A market usually remains active until the event occurs and the result is settled.
• Quotes: Polymarket uses an order book. The displayed probability usually reflects the midpoint between the best bid and best ask. When the spread exceeds $0.10, the interface uses the latest trade price instead. Matched Yes and No prices total $1.
• Trading and exit: While a market is open and counterparties are available, users can buy or sell outcome shares through the order book. Limit orders provide price control, but limited liquidity may prevent an exit at the expected price.
• Resolution: Markets are resolved under their published rules through the UMA Optimistic Oracle. After an outcome is proposed, there is a challenge period. Each winning share ultimately pays $1, while losing shares settle at zero.
• Fees: Polymarket currently states that taker fees apply in certain markets while makers are not charged. Parameters vary by market category, so users should check the latest fee schedule before trading.

Assessment: Polymarket suits users who want to trade changing event probabilities, use limit orders, and monitor market depth. Key checks include the exact rule wording, bid-ask spread, wallet setup, oracle dispute process, and regional availability.

Official sources: Polymarket Pricing Rules | Polymarket Resolution Rules | Polymarket Fee Rules

Kalshi: Standardized Yes/No Event Contracts

Kalshi is an event market built around standardized Yes/No contracts, clearly presented market rules, and order-book trading.

• Product: Markets mainly use Yes/No and threshold contracts. Each market provides a rule summary, expiration conditions, and an outcome-verification source.
• Quotes: Kalshi uses an order book, with prices quoted in cents. A 70-cent Yes contract and a 30-cent No contract can combine to $1. The best bid, best ask, and available size directly affect execution.
• Trading and exit: Users can open positions through the order book and sell to exit while the market remains open and liquidity is available. Unfilled orders can be canceled.
• Settlement: Each contract’s terms specify the information and sources used. After expiration, Kalshi determines the outcome under those terms. Kalshi states that settlement confirmation may take from about one hour to more than 12 hours after market close, depending on the data source.
• Fees: Trading fees are calculated using factors such as expected earnings, and some markets may also charge maker fees. Canceling an unfilled order is free. Users should review the actual fee shown on the market page before confirming an order.

Assessment: Kalshi presents contract terms and verification sources clearly and suits users who value standardized rules, order-book trading, and the ability to exit early. The fee formula, market liquidity, and regional eligibility should be checked separately.

Official sources: Kalshi Pricing Rules | Kalshi Market Rules | Kalshi Fee Rules

Robinhood: Access to Partner Exchanges Through a Familiar Interface

Robinhood provides access to event contracts from partner exchanges through a familiar interface. The exchange carrying each contract determines its pricing, settlement, and special-event rules.

• Product: Robinhood Derivatives offers event contracts through KalshiEX, ForecastEX, or Rothera Exchange and Clearing. Common formats include single-outcome Yes/No contracts, threshold contracts, and combination outcomes.
• Pricing and payout: A contract generally costs between $0.01 and $0.99. A correct outcome settles at $1 in cash, while an incorrect outcome settles at $0. The price and applicable fees are displayed before an order is submitted.
• Trading and exit: Unfilled orders can be canceled, but completed trades cannot be reversed. While a market remains open and buyers are available, a position can be sold at the current market price. If the market is closed or liquidity is unavailable, the contract must be held to settlement.
• Settlement: The relevant partner exchange determines the final outcome using the official data source and terms specified in the contract. Robinhood cannot change the exchange’s settlement decision.
• Fees: A trade may involve both exchange fees and a Robinhood commission. The applicable amount is displayed on the order confirmation screen.

Assessment: Robinhood suits existing users who value a unified interface. Users should identify the exchange carrying the contract because settlement, fees, and special-event rules are determined at the contract level.

Official sources: How Robinhood Event Contracts Work | Canceling and Closing Event Contracts

TurboFlow: An On-Chain Trading Ecosystem Built for Retail

TurboFlow is an on-chain trading ecosystem for global retail users at the intersection of prediction markets and perpetual contracts. It brings Perpetuals, Event Contracts, and Prediction Markets together on one platform, using transparent execution and professional liquidity to make participation more accessible.

• Product: This review focuses on TurboFlow Event Contracts: short-cycle Higher/Lower contracts over fixed time windows. Users select a market, stake, duration, and direction. Participation starts from $2, and a round can settle in as little as 30 seconds. Live parameters should be confirmed on the product page.
• Pricing and participation: An automated market maker (propAMM) generates quotes using market, duration, and risk parameters. Before confirmation, the interface displays the Enter Price, stake, duration, direction, return rate, and projected outcome. Once the order is confirmed, the contract’s return rate is locked.
• Settlement: The Enter Price is the price when the order is accepted, and the Exit Price is the price used when the contract expires. A Higher position wins only when the Exit Price is above the Enter Price; the reverse applies to a Lower position. If the two prices are equal, the stake is returned under the published rules.
• Position management: The contract settles automatically when the countdown ends. During the contract term, users do not need to manage margin, funding rates, or liquidation. This mechanism is distinct from TurboFlow’s perpetual-contract product.

Assessment: TurboFlow is built for retail users, lowering the entry threshold for Event Contracts with a $2 minimum and durations starting from 30 seconds while integrating perpetual contracts and prediction markets on the same platform. Short-cycle Higher/Lower contracts are especially sensitive to entry timing, market volatility, and price data.

Official source: TurboFlow Event Contracts

Core Differences

• Price formation: Polymarket and Kalshi mainly use order books. Robinhood displays market prices from partner exchanges. TurboFlow Event Contracts use an automated market maker (propAMM) to generate quotes and show the Enter Price, stake, duration, direction, and locked return rate before confirmation.
• Time horizon: Polymarket, Kalshi, and Robinhood contracts generally run until an event-related deadline. TurboFlow Event Contracts use fixed time windows and can settle in as little as 30 seconds.
• Early exit: The first three product types generally allow positions to be sold while the market is open and liquidity is available. TurboFlow’s published Event Contract flow is designed around holding until the countdown ends and automatic settlement.
• Settlement authority: Polymarket uses the UMA oracle; Kalshi determines outcomes under its market rules and specified sources; Robinhood relies on the partner exchange; TurboFlow Event Contracts settle automatically under pre-disclosed contract rules using trusted market-data sources and Enter and Exit Prices generated from multiple oracles.
• Best fit: Users who want to follow continuously changing event probabilities may prefer Polymarket. Those who prioritize standardized market rules may consider Kalshi. Users who prefer Robinhood’s unified interface can review contracts offered by its partner exchanges. Users seeking low-entry, short-cycle Higher/Lower contracts may consider TurboFlow Event Contracts.

Key Risks

• Loss of stake: A wrong directional call can cause a contract to settle at zero, and fixed-return products may result in the loss of the full stake.
• Rule risk: Missing a boundary value, time zone, data source, or exceptional-event clause can lead to incorrect expectations about settlement.
• Liquidity and spread risk: Displayed probability, executable price, and early-exit price can differ materially.
• Settlement and data risk: Delayed or corrected official data, oracle disputes, or price-source failures can delay settlement or trigger special rules.
• Fee risk: Trading fees, commissions, on-chain network costs, and deposit or withdrawal fees reduce actual returns.
• Technology and compliance risk: Account security, smart-contract risk, platform operations, and regional restrictions can affect product availability.

Summary

Event contracts can be evaluated through five stages: question definition, price formation, trading and exit, outcome determination, and fund settlement. Polymarket, Kalshi, Robinhood, and TurboFlow Event Contracts take different product approaches. TurboFlow itself is an on-chain trading ecosystem combining prediction markets and perpetual contracts; this article reviews only its Event Contract product. A platform name is not a substitute for checking each contract’s terms. The decisive factors are the stated timing, data source, boundary conditions, and exceptional-event rules.