The rolling basis is inferred from futures contracts listed on the market. Sometimes, the rolling basis chart will not display data and appear like this:
Figure 1: BTC Futures Annualised percentage basis
This happens when the rolling basis calculation fails because of the absence of a future contract on the market such as \(T_{1} \leq T_{target}\) or \(T_{2} \geq T_{target} \) . The calculation resumes when such a contract becomes available.