Retrieves the historical basis APR for an instrument on an exchange.
*Note: Implied yield is only calculated for instruments which have not expired yet.
|timestamp||The day of the basis APR calculation.|
|settlement||The timestamp of the settlement of the contract|
|price||The price of the instrument at the point of time.|
|spot||The spot price of the underlying asset at the point in time.|
|apr||The current basis APR for the instrument|