I am trying to understand the role of cupom cambial (onshore dollar rate) in relation to the BCB swaps which are domestic NDF settled in real.
"The cupom cambial is priced in basis points as an interest rate equal to the spread between the overnight interbank deposit interest rate and the exchange rate variation prior to maturity of the contract. As a matter of interest rate parity, the Cupom Cambial is economic equivalent to the onshore U.S. dollar interest rate"
Can you explain why the the covered interest parity implies that the cupom cambial is the onshore USD rate? A numerical example would help...