How Does OKX Event Contract Determine Wins and Losses? Orders, Early Exit, and Dispute Settlement

OKX

01 October 2026

OKX Event Contract has two completely different ways to determine wins and losses: closing a position early before expiry and holding to expiry for automatic settlement. If you sell early, your profit or loss comes from the price difference on the order book. If you hold to expiry, the result depends on comparing the settlement price with the target price. If you are correct, each contract pays 1 USDT. If you are wrong, it becomes zero.

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Buying and Selling: The Price Itself Is a Probability

Event Contract prices move between 0.01 and 0.99 USDT. This price directly reflects how the market views the probability that the event will happen. If a "Yes" contract is quoted at 0.40 USDT, it means the market thinks there is about a 40% chance the event will occur.

When you buy, you choose a direction on the order book: Buy Yes means you think the event will happen, and Buy No means you think it will not happen. Buying requires an equal amount of USDT as margin. There is no leverage and no liquidation mechanism. Your maximum loss is the amount you paid when you bought.

One design detail is worth noting: Yes and No contracts share liquidity on the same order book through automatic pairing based on (1 − price). A Yes sell order at 0.70 USDT is equivalent to providing a No buy order at 0.30 USDT. This means you do not need to wait for "another No trader" to appear before you can trade.

Closing Early: Locking in Profit or Cutting Losses

Before the settlement result is announced, you can sell your contracts on the order book at any time. This is a key difference between Event Contract and traditional options: you do not need to hold until expiry.

Realized profit and loss is calculated as:

Realized PnL = (Average Sell Price − Average Buy Price) × Quantity Sold − Selling Fees

OKX's official example: you buy 100 Yes contracts at 0.40 USDT. When the price rises to 0.72 USDT, you sell all of them. Your profit is about +32 USDT before fees.

If the price moves against you, the same logic applies to stop losses: sell before the contract price falls further to avoid losing everything.

Holding to Expiry: Automatic Settlement by the System

If you do not sell early, the system automatically settles the contract at expiry. You do not need to do anything manually.

Settlement is a binary decision:

If you are correct: each contract is redeemed for 1 USDT, minus settlement fees.
If you are wrong: the contract value becomes 0, and no settlement fee is charged.

Example: you buy 100 Yes contracts at 0.40 USDT. At expiry, the settlement price is higher than the target price, so Yes wins. You receive 100 × 1.00 = 100 USDT before fees. Your profit is about +60 USDT.

Dispute Settlement: What Triggers a Review

In most cases, settlement is automatic. But certain unusual situations can trigger a dispute review process.

There are two types of trigger conditions: automatic system triggers, such as missing settlement price data or risk control rules being hit, or manual triggers, such as the platform detecting an abnormality or a user submitting a complaint through a ticket.

Insufficient data has clear thresholds. According to the user agreement, if fewer than 30 out of the required 60 second-level index data points are available within the settlement window, OKX will pause settlement and start a dispute period for manual review. For range contracts, if available data points are less than 50%, a review is also triggered.

What changes during a review: settlement is paused, and affected unfilled orders are canceled at the specified settlement time. After the review is complete, open positions are settled at the confirmed price. If the original price is confirmed as correct, settlement uses the original price. If an error is found, settlement is recalculated using the corrected price.

How the Settlement Price Is Calculated: Note the May 2026 Rule Change

OKX adjusted how the settlement price is calculated for Up/Down Event Contracts in May 2026. The new rule applies to contracts with an expiry time later than 16:00 (UTC+8) on May 14, 2026.

The specific changes are:

Settlement data: changed from "the arithmetic average of second-level index candlestick open prices within the settlement window" to "the arithmetic average of close prices."
Settlement window for 15-minute Up/Down events: shortened from 60 seconds, or 60 data points, to 15 seconds, or 15 data points.

For example, a BTC 15-minute Up/Down event expires at 16:00:00. Under the new rule, the settlement window is 15:59:45 to 15:59:59, a total of 15 data points. The settlement price is the arithmetic average of the close prices of these second-level index candlesticks.

This change only affects how the settlement price is calculated. Users' settlement amounts and fees remain the same, and no action is needed on positions.

Special Features of Range Contracts

Besides Up/Down contracts, OKX also offers Range, or Between, contracts. Their rules are importantly different from Up/Down contracts.

Range contracts are judged only once at expiry. Whether the price moves outside the range during the contract period does not affect the result. The only thing that matters is whether the settlement price at expiry falls within the range [a, b), which is left-closed and right-open. Equal to the lower bound counts as "Yes," and equal to the upper bound counts as "No."

Range contracts do not support early settlement. The settlement price is the arithmetic average of 60 second-level index prices within the 1-minute window before expiry.

Completion Standard

The final win or loss of an Event Contract is ultimately reflected in changes to your account balance. When you close a position early, realized profit or loss is credited in real time once the sell order is filled. When you hold to expiry, profit or loss is automatically transferred to your account after settlement is complete, the position is closed, and the contract is automatically delisted.

If you disagree with a settlement result, you can submit a complaint through a ticket to trigger a manual review process. But note that a review is a multi-round independent audit process. It may delay settlement, and the final result depends on the platform's review of index data.