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.
Checklist
- How is the settlement price calculated?
- How is a Between contract settled?
- How is a dispute triggered and processed?
Notes
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".
With lower bound a and upper bound b (a < b):
Details follow the official OKX help article; this page is a learning checklist, not an official mirror.
