FRA is a
direct subtype of Swap with functions FRA Functions, keys FRA keys and example object FRA#1 that represents an agreement to enter into a loan (deposit) at some specific future time over a certain time period and under an agreed fixed interest rate
In reality, the counterparties do not wait until the end of the loan (deposit) period in order to exchange the accrued funds.
The discounted proceeds are paid out immediately at the begining of the forward period, resulting in a net cash flow given by the form:
where I is the index' realized value at the begining of the forward period, K is the strike and Δt is the length of the forward accrual period.
The cash flow denomination currency in both legs is assumed to be that of the index entered in Index
If strike/forward rate is desired, it can be obtained via the function
Fwd Rate. In this case, the strike variable in the constructor is irrelevant and will be ignored.

The following quantities may be also calculated and reported along the price.
List of valid values:
Fwd Rate
Refers to the output of QuantLib's forwardRate function.
Refers to the related forward rate.

The output is a number that represents the price of the referenced tradable, which is the present value of all expected future cash flows, whereby "today" represents the currently set global valuation (trade) date or its overwrite through the
As Of.
The cash flows occurring on the trade date are included only if
Trade Date CFs is set to TRUE

Settle Date
Refers to the output of QuantLib's settlementDate function.
Refers to the date the fra contract comes into life and any related repo rate starts accruing.

Spot Value
Refers to the output of QuantLib's spotValue function.
NPV of underlying loan (deposit). Always positive.