All Axi Index contracts are based on a relevant Futures exchange price, and each Futures contract has an expiry date. If your trade remains open on the date the contract expires, the trade will be rolled over and an adjustment will be made to reflect the difference in contract pricing.
For reference, the Spot Price is the current market price at which an asset is bought or sold for immediate payment and delivery. With Futures, the price reflects the expected value at which an asset can be bought or sold for delivery in the future.