Event Contracts Between settlement FAQ

What is a Between contract?

A Between contract is settled once at expiry, based on whether the settlement price falls within a defined price range.Settlement anchor: OKX Spot Index Price.

How is the settlement price calculated?

The settlement price is the arithmetic mean of all the OKX Spot Index Price recorded every second during the 1-minute window immediately before expiry — 60 data points in total. For example, if the event expires at 18:30 UTC+8, the settlement window is 18:29:00–18:29:59 UTC+8.

When is the contract evaluated, and how is the outcome determined?

The contract is evaluated once at expiry. With lower bound a and upper bound b (a < b), if a ≤ settlement price < b, the contract settles as "Yes" (in range). Otherwise, it settles as "No" (out of range). The lower bound is inclusive and the upper bound is exclusive, meaning settlement price = lower bound a → "Yes", and settlement price = upper bound b → "No".

How is a Between contract settled?

With lower bound a and upper bound b (a < b):

• If a ≤ settlement price < b → settles as "Yes" (in range)

• Otherwise → settles as "No" (out of range)

Boundaries: the range is left-closed and right-open. The lower bound is included, and the upper bound is excluded.No early settlement: not supported. Price excursions during the contract life do not affect the result; only the expiry settlement price is used.Insufficient data: if usable index price data points within the settlement window fall below 50%, the event enters dispute review.

What happens if there is insufficient data or a market disruption?

If fewer than 50% of the index price data points are available in the settlement window, the event enters dispute review. If an unscheduled trading halt, early close, stale price, or other underlying market disruption occurs, the event also enters dispute review and OKX determines the final settlement price under the manual settlement procedure.

What are the special rules for XAU (Gold) contracts?

Gold's underlying market follows fixed trading sessions and holiday closures. OKX references the XCEC Holiday Calendar to identify scheduled non-trading days for the XAU index. If the scheduled expiry date of an XAU Between contract falls on a non-trading day, OKX will not list that contract. For listed XAU Between contracts, settlement is performed only when the underlying market is open for trading and index prices are available.

If an unscheduled trading halt, early close, stale price, insufficient data, or other underlying market disruption occurs, the event enters dispute review and OKX determines the final settlement price under the manual settlement procedure.

How is a dispute triggered and processed?

A dispute can be triggered automatically (e.g., missing index price data or a risk-control rule is hit) or manually (anomaly detected by the platform or reported via a user support ticket). Once triggered, a multi-round independent review is conducted. An authorised operator inputs the applicable settlement price, the corresponding reference timestamp, and the reason for manual settlement to confirm the final settlement price.

What happens to my orders and positions during a dispute?

During dispute review, settlement is suspended and all resting orders on the affected contract will be cancelled at the designated settlement time. Open positions will be settled at the confirmed price once the review is complete.

What is the outcome of a dispute?

If the original price is confirmed correct, the contract settles at the original price. If a price error is identified, the contract is re-settled at the corrected price.

Are there any fees for settlement?

No. Upon settlement, profit and loss are credited to the user's account and the position is closed. No additional fees are charged for settlement.

What are the key risks I should be aware of?

• Settlement is anchored solely to the OKX Spot Index Price. The settlement price is the arithmetic mean over the time window immediately before expiry and may differ from the price on any single exchange at a given moment.

• Gold's underlying TradFi market follows fixed trading sessions and holiday closures, and may experience unscheduled trading halts, early closes, stale prices, or insufficient data — any of which may trigger dispute review.

• In situations such as major market disruption or systems failture, OKX reserves the right to temporarily pause trading or suspend settlement on affected Event Contracts. OKX aims to resume normal operations as quickly as possible and will keep you updated through its official channels.